WO2016060444A1 - Copper alloy material for connectors with high strength, high thermal resistance, high corrosion resistance and excellent bending processability, and method for producing the same - Google Patents
Copper alloy material for connectors with high strength, high thermal resistance, high corrosion resistance and excellent bending processability, and method for producing the same Download PDFInfo
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- WO2016060444A1 WO2016060444A1 PCT/KR2015/010787 KR2015010787W WO2016060444A1 WO 2016060444 A1 WO2016060444 A1 WO 2016060444A1 KR 2015010787 W KR2015010787 W KR 2015010787W WO 2016060444 A1 WO2016060444 A1 WO 2016060444A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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- the present invention relates to a copper alloy material for vehicle connectors with excellent strength, thermal resistance, corrosion resistance, and bending processability, and a method of preparing the same. More particularly, the copper alloy material of the present invention has improved or maintained strength, thermal resistance, corrosion resistance, and bending processability, when compared with brass and conventional connector material, and may be suitably used as a material for wire harnesses by mixing with cheap metals.
- Brass Cu-Zn based alloy
- Brass is variously used as a line connection component in vehicles, data communication equipment, household electrical appliances, and the like.
- connection components such as a connector and the like are miniaturized, light, thin, short, and small electric and electronic components are required. Narrow pitch and a plurality of pins for terminals applied to such components are required and, as such, copper alloy materials become thin. Accordingly, a copper alloy material having relatively high strength is required.
- brass includes a large amount of zinc (Zn) having a low melting point, it is not easy to improve strength while maintaining processability.
- a connector for vehicles since a connector for vehicles is used in a more severe environment such as an engine room or the like, must be miniaturized, and has a complex shape, high strength, excellent bending processability, softening resistance, and electrical conductivity of a constant level or more are required.
- a terminal component, one of vehicle connectors, generating heat from a headlight socket and the like is repeatedly exposed to heat of approximately 80 to 120°C and, as such, receives zero stress.
- conventional connectors manufactured with brass and phosphor bronze have low softening resistance and, as such, when exposed to zero stress for a long period of time, short circuit of signal and electricity may occur due to poor connection between connectors. Therefore, in connectors of expensive vehicles, an expensive and high functional copper alloy material is mainly used instead of brass and phosphor bronze.
- cheap brass and phosphor bronze are applied to vehicles connectors domestically.
- Patent No.2006-188722 discloses a brass material including 20 to 37 wt% of Zn and 1 wt% or less of elements except Cu and Zn and having a tensile strength of 500 N/mm 2 or more and satisfactory characteristics at 180° bending processability through a process composed of hot rolling, intermediate cold rolling, intermediate heat treatment, and finishing cold rolling.
- Prior Art 1 obtains a product by processing a material into required thickness through the described process.
- a copper alloy material prepared according to Prior Art 1 was composed of only Cu and Zn, sufficient strength to use for vehicle connectors was not secured although a unique preparation method was used to secure bending processability and strength.
- Prior Art 1 does not refer to characteristics such as thermal resistance and corrosion resistance.
- Japanese Patent No. 2000-129376 discloses mixed tissue brass having two phases composed of a fine ⁇ phase and ⁇ phase.
- brass for terminals generally used has only an ⁇ phase.
- a ⁇ phase of the brass having only the ⁇ phase brass may be increased by increasing the amount of Zn in a copper alloy composition.
- a phase of the brass having only the ⁇ phase brass is substituted by an ⁇ + ⁇ phase, corrosion resistance thereof is deteriorated due to the ⁇ phase.
- Prior Art 2 discloses only 90° evaluation with respect to bending processability. In currently and generally used terminals, evaluation of 180° bending processability is essential. However, descriptions of such an evaluation were not disclosed.
- An object of the present invention devised to solve the problem lies on provision of a copper alloy material for terminals, the copper alloy material satisfying a tensile strength of 560 to 650 N/mm 2 , an electrical conductivity of 10 to 25% IACS, an elongation percentage of 7 to 15%, softening resistance of 400°C or more, and corrosion resistance at high temperature, high humidity, and a corrosive environment and having bending processability suitable for processing of a terminal, and a method of preparing the same, to provide a copper alloy material with high strength, high thermal resistance, high corrosion resistance, and excellent bending processability, used as a component and the like of a connector for vehicles and electronic equipment.
- the object of the present invention can be achieved by providing a copper alloy material for vehicle connectors having high strength, high thermal resistance, high corrosion resistance and bending processability, the copper alloy material including 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, the remainder of Cu, and unavoidable impurities, based on 100 wt%.
- the copper alloy material may further include one element or more selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less.
- the copper alloy material may have a tensile strength of 560 to 650 N/mm 2 , an electrical conductivity of 10 to 25 %IACS, an elongation percentage of 7 to 15%, a softening resistance temperature of 400°C or more, a corrosion depth of 0.1 mm at a corrosion resistance test, and faultless bending processability at 90° and 180°.
- a method of preparing a copper alloy material having high strength, high thermal resistance, high corrosion resistance, and excellent bending processability including obtaining molten metal including 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, the remainder of Cu, and unavoidable impurities based on 100 wt%, obtaining ingot from the molten metal, hot rolling by heating the ingot to 850 to 950°C, first cold rolling, heat treating at 400 to 500°C for 5 to 10 hours to remove stress, subsequent (or second) cold rolling, and annealing at 600 to 800°C for 10 to 60 seconds.
- the molten metal may further include one element or more selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less.
- the subsequent cold rolling and annealing at 600 to 800°C for 10 to 60 seconds may be repeatedly carried out to prepare a final copper alloy material having a desired thickness.
- the copper alloy material may have a tensile strength of 560 to 650 N/mm 2 , an electrical conductivity of 10 to 25 %IACS, an elongation percentage of 7 to 15%, a softening resistance temperature of 400°C or more, a corrosion depth of 0.1 mm at a corrosion resistance test, and faultless bending processability at 90° and 180°.
- the present invention may provide a copper alloy material with a high strength of 560 to 650 N/mm 2 , an electrical conductivity of 10 to 25% IACS, an elongation percentage of 7 to 15%, softening resistance of 400°C or more, high corrosion resistance, and excellent bending processability and a method of preparing the same.
- FIG. 1 illustrates optical microscope images representing results of bending processability tests under conditions of 90° and 180° for copper alloy material samples prepared according to Example 1 and Comparative Examples 11 and 12;
- FIG. 2 illustrates softening resistance test results for copper alloy material samples prepared according to Example 1 and Comparative Examples 11 and 12;
- FIG. 3 illustrates optical microscope images representing dezincification test results of copper alloy material samples prepared according to Example 1 and Comparative Examples 11 and 12.
- the present invention relates to a copper alloy material with high strength, high thermal resistance, high corrosion resistance, and excellent bending processability, suitable for vehicle connectors, and a method of preparing the same.
- the copper alloy material with high strength, high thermal resistance, high corrosion resistance, and excellent bending processability includes 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, and the remainder of Cu and trace amounts of unavoidable impurities, based on 100 wt%.
- Zn improves thermal peeling resistance of plating, castability, bending processability, and corrosion resistance and is included in an amount of 5.0 to 40.0 wt%.
- the amount of Zn in the copper alloy material according to the present invention is less than 5 wt%, degasification and thermal peeling resistance of plating during a melting and casting process are not improved.
- the amount of Zn in the copper alloy material is greater than 40 wt%, castability, bending processability, and corrosion resistance are negatively affected due to increase of a ⁇ phase inducing brittleness resistance in a base.
- Fe in the copper alloy material of the present invention improves strength and softening resistance due to work hardening, and is included in an amount of 0.5 to 5.0 wt%.
- the amount of Fe is less than 0.5 wt%, sufficient strength may not be obtained.
- the amount of Fe is greater than 5.0 wt%, conductivity is dramatically reduced and castability is negatively affected.
- Sn in the copper alloy material helps to improve corrosion resistance and prevents dezincification by forming a passive film during contact with a corrosion medium.
- Sn is included in an amount of 0.5 to 2.0 wt% in the copper alloy material. When Sn is included in an amount of 0.5 wt%, corrosion resistance is not improved. On the other hand, when Sn is included in an amount of greater than 2.0 wt%, cracks may occur during hot working.
- the amount of Ni in the copper alloy material may be 0.01 to 0.3 wt%. When the amount of Ni is less than 0.01 wt%, tensile strength is not sufficiently improved. On the other hand, when the amount of Ni is greater than 0.3 wt%, tensile strength is improved but economic burden increases due to increased raw material costs and the like.
- unavoidable impurities are elements added through preparation processes. Since the unavoidable impurities are added in an extremely small amount, characteristics of a finally obtained copper alloy material are not affected.
- the copper alloy material according to the present invention may further include at least one element selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less.
- at least one element selected from the group consisting of Si, P, Al, Mg, and Ca is added in a small amount to improve deoxidation, degasification, and liquidity of molten metal during casting, castability may be improved by preventing bubbles of an ingot and interpenetration of oxides.
- the copper alloy material according to the present invention exhibits a tensile strength of 560 to 650 N/mm 2 , an electrical conductivity of 10 to 25 %IACS, an elongation percentage of 7 to 15%, a softening resistance temperature of 400°C or more, a corrosion depth of 0.1 mm at a corrosion resistance test, and faultless bending processability at 90° and 180°.
- the tensile strength means moldability when a material is processed into a terminal with a mold and mechanical properties of materials, related to binding properties between a female terminal and a male terminal after processing the terminal.
- tensile strength of the copper alloy material is extremely strong, the size of the copper alloy material is outside the size of a terminal due to poor flexural processability, and damage and abrasion of the mold worsen.
- tensile strength of the copper alloy material is extremely weak, defects such as bending and the like occurs during binding between terminals and, as such, a tensile strength of 560 to 650 N/mm 2 is required.
- the copper alloy material for vehicle connectors must have an electrical conductivity of at least 10 %IACS or more, particularly 10 to 25 %IACS.
- Elongation percentage is a characteristic related to tensile strength and bending processability of materials.
- tensile strength increases and bending processability is reduced.
- elongation percentage is high, tensile strength may be reduced and bending processability may become satisfactory. Therefore, to secure required tensile strength and satisfactory terminal molding properties through suitable process design, an elongation percentage of 7% or more, particularly 7 to 15%, is required.
- Bending processability is a fundamental characteristic in a connector preparation process and a final shape thereof is processed by processing to a profile shape after punching.
- bending processability of a material is poor, cracks are generated at a surface of a bended portion. Finally, when the portion having cracks receives external stress, binding strength is weakened and, as such, electrical reliability is lost.
- the terminal is miniaturized, the thickness of a copper alloy board becomes thinner and bending processability is increasingly required. Therefore, for use as a connector for vehicles, the copper alloy material must be faultless at 90° and 180° bending processability.
- "Faultless" used in the present specification means generation of only good or small wrinkles, as described in examples below.
- the copper alloy material according to the present invention exhibits excellent bending processability and, as such, may be applied even to miniaturized and complex connector components.
- the copper alloy material according to the present invention satisfies strength and bending processability suitable for vehicle connectors.
- Conventional brass is work hardened by rolling a board to improve strength and, as such, bending processability is reduced. That is, since existing brass cannot satisfy strength and bending processability at the same time, it is difficult for the existing brass to serve as a connector for vehicles.
- due to extremely poor hot processability (for example, hot rolling and the like) of some alloys it is difficult to prepare a board shape and preparation thereof is performed through casting.
- the copper alloy material since strength of the copper alloy material according to the present invention is secured after securing bending processability, the copper alloy material may be used for a vehicle connector and may be prepared into a board through a rolling process.
- softening resistance since a connector for vehicles is repeatedly used at of 100 to 120°C, softening due to repetitive zero stress may occur. Since existing brass and phosphor bronze alloys have a softening resistance temperature of 300 to 350°C, softening often occurs due to the repetitive zero stress. On the other hand, since the copper alloy material according to the present invention has excellent softening resistance and, thus, a softening resistance temperature of 400°C or more, signals and currents may be more stably transmitted.
- the copper alloy material according to the present invention is more desirable in that the copper alloy material may have superior performance in spite of low law material costs.
- dezincification of existing brass undermines strength of a contact portion and, as such, momentary short circuit of a contact portion of vehicle connectors may occur due to vibration. Such a phenomenon may cause a fire. Therefore, corrosion of the copper alloy material for vehicle connectors must be controlled to 0.1 mm or less during a corrosion resistance test. In the case of the copper alloy material according to the present invention, dezincification does not occur and, as such, a surface of the copper alloy material is maintained even in a corrosive environment when the material is prepared as a connector for vehicles. Therefore, reliability of an electrical contact portion may be guaranteed.
- the method of preparing the copper alloy material for vehicle connectors includes hot rolling by preparing molten metal through dissolution using a high, intermediate, or low frequency melting furnace to form the composition and by cutting ingot obtained from the molten metal through semi-continuous or continuous casting into proper length and heating to 850 to 950°C, first cold rolling, heat treating at 400 to 500°C for 5 to 10 hours to remove stress, subsequent cold rolling, and annealing at 600 to 800°C for 10 to 60 seconds.
- a copper alloy material having a required finishing rolling thickness, exhibiting high strength, high thermal resistance, corrosion resistance, and excellent bending processability may be prepared into a strip shape by repeatedly the subsequent (or second) cold rolling and annealing at 600 to 800°C for 10 to 60 seconds.
- the copper alloy having high strength, high thermal resistance, corrosion resistance, and excellent bending processability according to the present invention may be easily prepared without any problems using an ingot heating furnace or hot roller used in copper processing plants having general modern equipment.
- time taken from initiation of hot rolling to a final pass is approximately 10 minutes.
- cooling such as water cooling is carried out and then a hot-rolling strip is rolled into a coil shape. After the water cooling, the hot-rolling strip is first cold rolled to form a constant thickness and then heat treated.
- Annealing treatment to remove stress is preferably carried out for 1 to 10 hours at 400 to 500°C in a batch type annealing furnace.
- temperature is lower than the temperature range and/or treatment time is short, stress is insufficiently removed.
- temperature is high and/or treatment time is too long, economical efficiency is reduced.
- annealing for 10 to 60 seconds at 600 to 800°C may be repeatedly carried out according to the thickness of the copper alloy material.
- the method of preparing the copper alloy material according to the present invention is not limited to contents described above and required for a cold rolling process after additional hot rolling, heat treating to remove stress, surface cleaning (pickling), tensile annealing, tension leveling, and the like may be selected and combined as needed, as being generally performed in a copper processing plant, to meet customer requirements.
- Each alloy having compositions summarized in Table 1 is dissolved in a high frequency melting furnace.
- an ingot having a thickness of 200 mm x a width of 600 mm x a length of 7000 mm was cast using a semi-continuous casting device while coating molten metal using charcoal or argon gas.
- Unstable cast portions at top and bottom portions of the ingot were cut and then hot rolling was carried out by heating the ingot and setting a hot rolling initiation temperature to 870°C.
- a hot-rolling strip having a thickness of 12 mm was rapidly water cooled to the room temperature by spraying so as to roll to a coil shape. Subsequently, 1 mm of both surfaces was peeled to remove scales on surfaces.
- the thickness of the copper alloy material was first cold rolled such that the thickness thereof becomes 1.5 mm, and heat treatment was carried out at 450°C for 450 minutes to remove stress. Subsequent cold rolling (second cold rolling) and annealing at 780°C for 24 sec were carried out again such that the thickness of an obtained copper alloy material became 0.5 mm.
- Test Example 1 characteristic measurement test
- Samples obtained through the compositions and preparation method were cut and tensile strength (TS), elongation percentage (El), Vickers hardness (Hv), electrical conductivity (EC), and bending processability thereof were investigated.
- the tensile strength and the elongation percentage were measured in accordance with KS B0802, the Vickers hardness (Hv, 5kg) was measured in accordance with KS B0811, and the electrical conductivity related to conductivity of heat and electricity was measured in accordance with KS D0240.
- Sample 1 of the present invention results of Sample 1 of the present invention and Samples 11 and 12 of Comparative Examples 11 and 12 obtained at 90° and 180° were illustrated in FIG. 1.
- Sample 1 according to the present invention exhibits excellent bending processability at 90° and 180°, when compared with Samples 11 and 12 of Comparative Examples 11 and 12.
- a softening resistance test was carried out in the same manner as in the bending processability test.
- samples a central portion (width of 30 mm x length of 10 mm) of each of the copper alloy materials prepared according to the example and comparative examples was cut.
- Hardness of the samples was measured at room temperature (25°C) and after heating of 15 minutes at an interval of 50°C from 100°C, while observing softening temperature of rolling strips. Results are illustrated in FIG. 2.
- X axis represents temperature
- Y axis represents hardness
- graphs represent hardness measured after maintaining 15 minutes at a related temperature and cooling.
- FIG. 1 As illustrated in the bending processability test.
- Sample 1 (softening initiation temperature: approximately 400°C) of Example 1 of the present invention exhibits excellent softening resistance, when compared with Samples 11 and 12 (softening initiation temperatures: approximately 300°Cand 350°C) of Comparative Examples 11 and 12.
- Difference between a softening resistance temperature of Sample 1 prepared according to Example 1 and softening resistance temperatures of Sample 11 and 12 prepared according to Comparative Examples 11 and 12 is approximately 50 to 100°C. Due to such difference, when the sample according to Example 1 is applied to a connector for vehicles, excellent softening resistance is exhibited in spite of repeatedly zero stress and, thus, may be more stably used than existing brass and phosphor bronze.
- each of softening resistance temperatures thereof is 300°C and 350°C and, thus, signal short circuit due to softening at a contact portion of a connector may occur.
- Dezincification test for each sample was carried out in accordance with ISO-6509 test in the same manner as the method of preparing samples in the softening resistance test of the Test Example 1.
- the samples were perpendicularly soaked in an aqueous copper chloride solution of 1.0% m/m which is a mixture of distilled water and copper chloride (CuCl 2 ) for 24 hours. Subsequently, the samples were sectioned and corroded depths thereof were measured and evaluated. Obtained results are illustrated in FIG. 3. As shown in FIG. 3, Sample 1 of Example 1 does not exhibit dezincification (0 mm). Therefore, it is confirmed that Sample 1 of Example 1 exhibits excellent dezincification characteristics, when compared with Sample 11 and 12 of Comparative Examples 11 and 12.
- Dezincification of brass weakens strength of a contact portion and, as such, in the case of vehicles, momentary short circuit of a connector contact portion may occur, resulting in fire.
- Copper alloy prepared according to the present invention does not exhibit dezincification even under a corrosive environment and, as such, may maintain a surface of a connector even under corrosive environment when prepared into the connector. Accordingly, reliability of an electrical contact portion may be guaranteed.
- the copper alloy material for vehicle connectors according to the present invention satisfies high strength, high thermal resistance, high corrosion resistance, and bending processability due to addition of specific amounts of Fe, Sn, and Ni to Cu-Zn based alloy.
- the connector material for vehicles and the like useable under severe atmosphere may be prepared.
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Abstract
A copper alloy material with high strength, high thermal resistance, high corrosion resistance, and excellent bending processability, and a method of producing the same are disclosed. The copper alloy material includes 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, the remainder of Cu, and trace amounts of unavoidable impurities, based on 100 wt%, and exhibits characteristics such as high tensile strength, elongation percentage, and electrical conductivity, excellent bending processability, and the like. The copper alloy material may further include one element or more selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less. The method of producing the copper alloy material includes obtaining molten metal, obtaining ingot from the molten metal, hot rolling by heating the ingot to 800 to 900℃, first cold rolling, heat treating at 400 to 500℃ for 5 to 10 hours to remove stress, subsequent cold rolling, and annealing at 600 to 800℃ for 10 to 60 seconds.
Description
The present invention relates to a copper alloy material for vehicle connectors with excellent strength, thermal resistance, corrosion resistance, and bending processability, and a method of preparing the same. More particularly, the copper alloy material of the present invention has improved or maintained strength, thermal resistance, corrosion resistance, and bending processability, when compared with brass and conventional connector material, and may be suitably used as a material for wire harnesses by mixing with cheap metals.
Since Brass (Cu-Zn based alloy) has satisfactory processability and is cheap, brass is variously used as a line connection component in vehicles, data communication equipment, household electrical appliances, and the like.
Recently, since connection components such as a connector and the like are miniaturized, light, thin, short, and small electric and electronic components are required. Narrow pitch and a plurality of pins for terminals applied to such components are required and, as such, copper alloy materials become thin. Accordingly, a copper alloy material having relatively high strength is required. However, since brass includes a large amount of zinc (Zn) having a low melting point, it is not easy to improve strength while maintaining processability.
In particular, since a connector for vehicles is used in a more severe environment such as an engine room or the like, must be miniaturized, and has a complex shape, high strength, excellent bending processability, softening resistance, and electrical conductivity of a constant level or more are required. For example, a terminal component, one of vehicle connectors, generating heat from a headlight socket and the like is repeatedly exposed to heat of approximately 80 to 120℃ and, as such, receives zero stress. However, conventional connectors manufactured with brass and phosphor bronze have low softening resistance and, as such, when exposed to zero stress for a long period of time, short circuit of signal and electricity may occur due to poor connection between connectors. Therefore, in connectors of expensive vehicles, an expensive and high functional copper alloy material is mainly used instead of brass and phosphor bronze. However, due to high manufacturing costs, cheap brass and phosphor bronze are applied to vehicles connectors domestically.
Japanese Patent No.2006-188722 (Prior Art 1) discloses a brass material including 20 to 37 wt% of Zn and 1 wt% or less of elements except Cu and Zn and having a tensile strength of 500 N/mm2 or more and satisfactory characteristics at 180° bending processability through a process composed of hot rolling, intermediate cold rolling, intermediate heat treatment, and finishing cold rolling. Prior Art 1 obtains a product by processing a material into required thickness through the described process. However, since a copper alloy material prepared according to Prior Art 1 was composed of only Cu and Zn, sufficient strength to use for vehicle connectors was not secured although a unique preparation method was used to secure bending processability and strength. In addition, Prior Art 1 does not refer to characteristics such as thermal resistance and corrosion resistance.
In addition, Japanese Patent No. 2000-129376 (Prior Art 2) discloses mixed tissue brass having two phases composed of a fine α phase and β phase. However, brass for terminals generally used has only an α phase. A β phase of the brass having only the α phase brass may be increased by increasing the amount of Zn in a copper alloy composition. When a phase of the brass having only the α phase brass is substituted by an α+β phase, corrosion resistance thereof is deteriorated due to the β phase. In addition, Prior Art 2 discloses only 90° evaluation with respect to bending processability. In currently and generally used terminals, evaluation of 180° bending processability is essential. However, descriptions of such an evaluation were not disclosed.
An object of the present invention devised to solve the problem lies on provision of a copper alloy material for terminals, the copper alloy material satisfying a tensile strength of 560 to 650 N/mm2, an electrical conductivity of 10 to 25% IACS, an elongation percentage of 7 to 15%, softening resistance of 400℃ or more, and corrosion resistance at high temperature, high humidity, and a corrosive environment and having bending processability suitable for processing of a terminal, and a method of preparing the same, to provide a copper alloy material with high strength, high thermal resistance, high corrosion resistance, and excellent bending processability, used as a component and the like of a connector for vehicles and electronic equipment.
The object of the present invention can be achieved by providing a copper alloy material for vehicle connectors having high strength, high thermal resistance, high corrosion resistance and bending processability, the copper alloy material including 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, the remainder of Cu, and unavoidable impurities, based on 100 wt%. The copper alloy material may further include one element or more selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less. The copper alloy material may have a tensile strength of 560 to 650 N/mm2, an electrical conductivity of 10 to 25 %IACS, an elongation percentage of 7 to 15%, a softening resistance temperature of 400℃ or more, a corrosion depth of 0.1 mm at a corrosion resistance test, and faultless bending processability at 90° and 180°.
In another aspect of the present invention, provided herein is a method of preparing a copper alloy material having high strength, high thermal resistance, high corrosion resistance, and excellent bending processability, the method including obtaining molten metal including 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, the remainder of Cu, and unavoidable impurities based on 100 wt%, obtaining ingot from the molten metal, hot rolling by heating the ingot to 850 to 950℃, first cold rolling, heat treating at 400 to 500℃ for 5 to 10 hours to remove stress, subsequent (or second) cold rolling, and annealing at 600 to 800℃ for 10 to 60 seconds. The molten metal may further include one element or more selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less. The subsequent cold rolling and annealing at 600 to 800℃ for 10 to 60 seconds may be repeatedly carried out to prepare a final copper alloy material having a desired thickness. The copper alloy material may have a tensile strength of 560 to 650 N/mm2, an electrical conductivity of 10 to 25 %IACS, an elongation percentage of 7 to 15%, a softening resistance temperature of 400℃ or more, a corrosion depth of 0.1 mm at a corrosion resistance test, and faultless bending processability at 90° and 180°.
The present invention may provide a copper alloy material with a high strength of 560 to 650 N/mm2, an electrical conductivity of 10 to 25% IACS, an elongation percentage of 7 to 15%, softening resistance of 400℃ or more, high corrosion resistance, and excellent bending processability and a method of preparing the same.
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention.
In the drawings:
FIG. 1 illustrates optical microscope images representing results of bending processability tests under conditions of 90° and 180° for copper alloy material samples prepared according to Example 1 and Comparative Examples 11 and 12;
FIG. 2 illustrates softening resistance test results for copper alloy material samples prepared according to Example 1 and Comparative Examples 11 and 12; and
FIG. 3 illustrates optical microscope images representing dezincification test results of copper alloy material samples prepared according to Example 1 and Comparative Examples 11 and 12.
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
The present invention relates to a copper alloy material with high strength, high thermal resistance, high corrosion resistance, and excellent bending processability, suitable for vehicle connectors, and a method of preparing the same.
The copper alloy material with high strength, high thermal resistance, high corrosion resistance, and excellent bending processability according to the present invention includes 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, and the remainder of Cu and trace amounts of unavoidable impurities, based on 100 wt%.
In the copper alloy material, Zn improves thermal peeling resistance of plating, castability, bending processability, and corrosion resistance and is included in an amount of 5.0 to 40.0 wt%. When the amount of Zn in the copper alloy material according to the present invention is less than 5 wt%, degasification and thermal peeling resistance of plating during a melting and casting process are not improved. On the other hand, when the amount of Zn in the copper alloy material is greater than 40 wt%, castability, bending processability, and corrosion resistance are negatively affected due to increase of a β phase inducing brittleness resistance in a base.
Fe in the copper alloy material of the present invention improves strength and softening resistance due to work hardening, and is included in an amount of 0.5 to 5.0 wt%. When the amount of Fe is less than 0.5 wt%, sufficient strength may not be obtained. On the other hand, when the amount of Fe is greater than 5.0 wt%, conductivity is dramatically reduced and castability is negatively affected.
Sn in the copper alloy material helps to improve corrosion resistance and prevents dezincification by forming a passive film during contact with a corrosion medium. Sn is included in an amount of 0.5 to 2.0 wt% in the copper alloy material. When Sn is included in an amount of 0.5 wt%, corrosion resistance is not improved. On the other hand, when Sn is included in an amount of greater than 2.0 wt%, cracks may occur during hot working.
Due to addition of a small amount of Ni to the copper alloy material, solid solubility of Fe is improved and effects of work hardening may be maximized. The amount of Ni in the copper alloy material may be 0.01 to 0.3 wt%. When the amount of Ni is less than 0.01 wt%, tensile strength is not sufficiently improved. On the other hand, when the amount of Ni is greater than 0.3 wt%, tensile strength is improved but economic burden increases due to increased raw material costs and the like.
In the present invention, unavoidable impurities are elements added through preparation processes. Since the unavoidable impurities are added in an extremely small amount, characteristics of a finally obtained copper alloy material are not affected.
The copper alloy material according to the present invention may further include at least one element selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less. When the at least one element selected from the group consisting of Si, P, Al, Mg, and Ca is added in a small amount to improve deoxidation, degasification, and liquidity of molten metal during casting, castability may be improved by preventing bubbles of an ingot and interpenetration of oxides.
The copper alloy material according to the present invention exhibits a tensile strength of 560 to 650 N/mm2, an electrical conductivity of 10 to 25 %IACS, an elongation percentage of 7 to 15%, a softening resistance temperature of 400℃ or more, a corrosion depth of 0.1 mm at a corrosion resistance test, and faultless bending processability at 90° and 180°.
The tensile strength means moldability when a material is processed into a terminal with a mold and mechanical properties of materials, related to binding properties between a female terminal and a male terminal after processing the terminal. When tensile strength of the copper alloy material is extremely strong, the size of the copper alloy material is outside the size of a terminal due to poor flexural processability, and damage and abrasion of the mold worsen. On the other hand, when tensile strength of the copper alloy material is extremely weak, defects such as bending and the like occurs during binding between terminals and, as such, a tensile strength of 560 to 650 N/mm2 is required.
Electrical conductivity is a fundamental characteristic of a connector material and a terminal functions as a migration channel of current. When electrical conductivity is extremely low, heat is generated due to increase of electrical resistance and, as such, transformation of a bound terminal may be induced. Therefore, the copper alloy material for vehicle connectors must have an electrical conductivity of at least 10 %IACS or more, particularly 10 to 25 %IACS.
Elongation percentage is a characteristic related to tensile strength and bending processability of materials. When the elongation percentage is low, tensile strength increases and bending processability is reduced. On the other hand, when the elongation percentage is high, tensile strength may be reduced and bending processability may become satisfactory. Therefore, to secure required tensile strength and satisfactory terminal molding properties through suitable process design, an elongation percentage of 7% or more, particularly 7 to 15%, is required.
Bending processability is a fundamental characteristic in a connector preparation process and a final shape thereof is processed by processing to a profile shape after punching. When bending processability of a material is poor, cracks are generated at a surface of a bended portion. Finally, when the portion having cracks receives external stress, binding strength is weakened and, as such, electrical reliability is lost. When the terminal is miniaturized, the thickness of a copper alloy board becomes thinner and bending processability is increasingly required. Therefore, for use as a connector for vehicles, the copper alloy material must be faultless at 90° and 180° bending processability. "Faultless" used in the present specification means generation of only good or small wrinkles, as described in examples below.
The copper alloy material according to the present invention exhibits excellent bending processability and, as such, may be applied even to miniaturized and complex connector components.
Meanwhile, it is known that tensile strength of a copper alloy material prepared according to Prior Art 1 (Japanese Patent No. 2006-188722) described above is weaker, when compared with the copper alloy material according to the present invention. Data on an elongation percentage, electrical conductivity, and the like is not disclosed.
In addition, it is known that electrical conductivity of a copper alloy material prepared according to Prior Art 2 (Japanese Patent No. 2000-129736) described above is deteriorated, when compared with the copper alloy material according to the present invention. Data for softening resistance, bending processability, dezincification, and the like is not disclosed. In this regard, since the copper alloy according to Prior Art 2 is composed of only copper and zinc, persons of ordinary skill in the art may easily predict, through existing brass characteristics, that softening resistance, bending processability, and dezincification of the copper alloy are poor.
On the other hand, the copper alloy material according to the present invention satisfies strength and bending processability suitable for vehicle connectors. Conventional brass is work hardened by rolling a board to improve strength and, as such, bending processability is reduced. That is, since existing brass cannot satisfy strength and bending processability at the same time, it is difficult for the existing brass to serve as a connector for vehicles. In addition, due to extremely poor hot processability (for example, hot rolling and the like) of some alloys, it is difficult to prepare a board shape and preparation thereof is performed through casting. However, since strength of the copper alloy material according to the present invention is secured after securing bending processability, the copper alloy material may be used for a vehicle connector and may be prepared into a board through a rolling process.
With respect to softening resistance, since a connector for vehicles is repeatedly used at of 100 to 120℃, softening due to repetitive zero stress may occur. Since existing brass and phosphor bronze alloys have a softening resistance temperature of 300 to 350℃, softening often occurs due to the repetitive zero stress. On the other hand, since the copper alloy material according to the present invention has excellent softening resistance and, thus, a softening resistance temperature of 400℃ or more, signals and currents may be more stably transmitted.
In addition, the copper alloy material according to the present invention is more desirable in that the copper alloy material may have superior performance in spite of low law material costs.
In addition, with respect to the dezincification characteristics, dezincification of existing brass undermines strength of a contact portion and, as such, momentary short circuit of a contact portion of vehicle connectors may occur due to vibration. Such a phenomenon may cause a fire. Therefore, corrosion of the copper alloy material for vehicle connectors must be controlled to 0.1 mm or less during a corrosion resistance test. In the case of the copper alloy material according to the present invention, dezincification does not occur and, as such, a surface of the copper alloy material is maintained even in a corrosive environment when the material is prepared as a connector for vehicles. Therefore, reliability of an electrical contact portion may be guaranteed.
Method
of
preparing
copper
alloy
material
according
to
the
present
invention
Meanwhile, a method of preparing the copper alloy material having high strength, high thermal resistance, high corrosion resistance, and excellent bending processability for vehicle connectors according to the present invention will be described below.
In more particular, the method of preparing the copper alloy material for vehicle connectors according to the present invention includes hot rolling by preparing molten metal through dissolution using a high, intermediate, or low frequency melting furnace to form the composition and by cutting ingot obtained from the molten metal through semi-continuous or continuous casting into proper length and heating to 850 to 950℃, first cold rolling, heat treating at 400 to 500℃ for 5 to 10 hours to remove stress, subsequent cold rolling, and annealing at 600 to 800℃ for 10 to 60 seconds.
In the present invention, a copper alloy material having a required finishing rolling thickness, exhibiting high strength, high thermal resistance, corrosion resistance, and excellent bending processability may be prepared into a strip shape by repeatedly the subsequent (or second) cold rolling and annealing at 600 to 800℃ for 10 to 60 seconds.
The copper alloy having high strength, high thermal resistance, corrosion resistance, and excellent bending processability according to the present invention may be easily prepared without any problems using an ingot heating furnace or hot roller used in copper processing plants having general modern equipment.
Generally, time taken from initiation of hot rolling to a final pass is approximately 10 minutes. After finishing the hot rolling and final pass, cooling such as water cooling is carried out and then a hot-rolling strip is rolled into a coil shape. After the water cooling, the hot-rolling strip is first cold rolled to form a constant thickness and then heat treated.
Annealing treatment to remove stress is preferably carried out for 1 to 10 hours at 400 to 500℃ in a batch type annealing furnace. When temperature is lower than the temperature range and/or treatment time is short, stress is insufficiently removed. On the other hand, when temperature is high and/or treatment time is too long, economical efficiency is reduced.
In the subsequent cold rolling, annealing for 10 to 60 seconds at 600 to 800℃ may be repeatedly carried out according to the thickness of the copper alloy material.
Meanwhile, the method of preparing the copper alloy material according to the present invention is not limited to contents described above and required for a cold rolling process after additional hot rolling, heat treating to remove stress, surface cleaning (pickling), tensile annealing, tension leveling, and the like may be selected and combined as needed, as being generally performed in a copper processing plant, to meet customer requirements.
Now, the present invention will be described in more detail with reference to the following examples. These examples are provided only for illustration of the present invention and should not be construed as limiting the scope and spirit of the present invention.
Example
Preparation
example
:
Examples
1
to
10
and
Comparative
Examples
11
to
18
Each alloy having compositions summarized in Table 1 is dissolved in a high frequency melting furnace. In addition, to prevent oxidation, an ingot having a thickness of 200 mm x a width of 600 mm x a length of 7000 mm was cast using a semi-continuous casting device while coating molten metal using charcoal or argon gas.
Unstable cast portions at top and bottom portions of the ingot were cut and then hot rolling was carried out by heating the ingot and setting a hot rolling initiation temperature to 870℃.
After termination of hot rolling, a hot-rolling strip having a thickness of 12 mm was rapidly water cooled to the room temperature by spraying so as to roll to a coil shape. Subsequently, 1 mm of both surfaces was peeled to remove scales on surfaces. In addition, the thickness of the copper alloy material was first cold rolled such that the thickness thereof becomes 1.5 mm, and heat treatment was carried out at 450℃ for 450 minutes to remove stress. Subsequent cold rolling (second cold rolling) and annealing at 780℃ for 24 sec were carried out again such that the thickness of an obtained copper alloy material became 0.5 mm. Subsequent cold rolling (third cold rolling) and annealing at 780℃ for 12 sec were carried out again such that the thickness of an obtained copper alloy material became 0.26 mm. Subsequent cold rolling (fourth cold rolling) was carried out such that the thickness of finally obtained copper alloy material became 0.2 mm, resulting in a rolling strip.
In addition, so as to clean a surface, a calibration process was carried out using a tension leveler after second heat treatment, while pickling after optional stress removal heat treatment.
Table 1
| Classification | Sample No. | Components (wt%) | |||||||
| Cu | Zn | Fe | Sn | Ni | Si | Mg | Al | ||
| Example(present invention) | 1 | Bal. | 12.5 | 1.2 | 1.5 | 0.05 | - | - | |
| 2 | Bal. | 25 | 1.5 | 0.5 | 0.05 | - | - | ||
| 3 | Bal. | 25 | 3.0 | 1.0 | 0.05 | - | - | ||
| 4 | Bal. | 39 | 1.5 | 1.5 | 0.05 | - | - | ||
| 5 | Bal. | 35 | 3.0 | 1.5 | 0.05 | - | - | ||
| 6 | Bal. | 25 | 1.5 | 1.2 | 0.05 | - | - | ||
| 7 | Bal. | 35 | 1.5 | 2.0 | 0.05 | - | - | ||
| 8 | Bal. | 12.5 | 1.2 | 1.5 | 0.05 | 0.9 | - | - | |
| 9 | Bal. | 39 | 1.2 | 1.5 | 0.05 | - | 0.9 | - | |
| 10 | Bal. | 25 | 1.2 | 1.5 | 0.05 | - | - | 0.9 | |
| Comparative Examples | 11(AD442) | Bal. | 25.3 | 0.8 | - | - | - | - | - |
| 12(C2600) | Bal. | 29.9 | - | - | - | - | - | - | |
| 13(JP 2006-188722) | Bal. | 30 | - | - | - | - | - | - | |
| 14(JP 2000-129376) | Bal. | 37.3 | - | - | - | - | - | - | |
| 15 | Bal. | 25 | 0.3 | 1.2 | 0.05 | - | - | - | |
| 16 | Bal. | 25 | 5.5 | 1.2 | 0.05 | - | - | - | |
| 17 | Bal. | 25 | 1.5 | 0.3 | 0.05 | - | - | - | |
| 18 | Bal. | 25 | 1.5 | 1.2 | 0.5 | - | - | - | |
* AD442: available from DOWA company (use area: connector and the like)
* C2600: Cu-30Zn (for general use)
Test
Example
1:
characteristic
measurement
test
Samples obtained through the compositions and preparation method were cut and tensile strength (TS), elongation percentage (El), Vickers hardness (Hv), electrical conductivity (EC), and bending processability thereof were investigated.
The tensile strength and the elongation percentage were measured in accordance with KS B0802, the Vickers hardness (Hv, 5kg) was measured in accordance with KS B0811, and the electrical conductivity related to conductivity of heat and electricity was measured in accordance with KS D0240.
The bending processability was measured in accordance with KSB 0804 (flexural test method of metal material).
The test results are summarized in Table 2.
Table 2
| Classification | SampleNo. | TS(N/mm2) | El(%) | Vickers hardness(Hv, 5kg) | E.C(%IACS) | Dezincification(mm) | Bending processability | |||
| GW | BW | |||||||||
| 90° | 180° | 90° | 180° | |||||||
| Example(present invention) | 1 | 586 | 12 | 182 | 19 | 0.0 | A | A | A | A |
| 2 | 610 | 10 | 209 | 17 | 0.0 | A | A | A | A | |
| 3 | 590 | 11 | 185 | 16 | 0.0 | A | A | A | A | |
| 4 | 640 | 10 | 228 | 17 | 0.0 | A | A | B | B | |
| 5 | 630 | 7 | 218 | 11 | 0.0 | A | B | A | B | |
| 6 | 611 | 11 | 207 | 13 | 0.0 | A | A | A | A | |
| 7 | 634 | 7 | 224 | 13 | 0.0 | B | A | A | A | |
| 8 | 588 | 11 | 185 | 18 | 0.0 | A | A | A | A | |
| 9 | 642 | 9 | 229 | 16 | 0.0 | A | B | B | B | |
| 10 | 601 | 9 | 211 | 15 | 0.0 | A | B | A | B | |
| Comparative Examples | 11(AD442) | 640 | 5 | 200 | 25 | 0.3 | C | B | C | C |
| 12(C2600) | 525 | 13 | 175 | 27 | 1.2 | A | B | B | B | |
| 13(JP 2006-188722) | 520 | 13 | 110 | 27 | 1.2 | A | A | A | B | |
| 14(JP 2000-129376) | 535 | 26 | 118 | 26 | 0.8 | A | A | A | B | |
| 15 | 575 | 12 | 175 | 15 | 0.1 | A | A | A | A | |
| 16 | 638 | 6 | 226 | 9 | 0.0 | B | C | B | C | |
| 17 | 590 | 11 | 186 | 14 | 0.7 | A | A | A | A | |
| 18 | 632 | 8 | 223 | 9 | 0.0 | B | B | B | B | |
Meanwhile, the bending processability of Table 2 was evaluated by observing surface defects of bended faces with an optical microscope after preparing samples by cutting a central portion (width of 30 mm x length of 10 mm) of each of the copper alloy materials prepared according the example and comparative examples and then bending each of the samples in accordance with KSB 0804 (metal material flexural test method) into a rolling direction (good way, GW) and a direction perpendicular to a rolling direction (bad way, BW) at a condition of 90°(R/t=0) and 180°(R/t=1). Burst of external portions of Bended portions and other defects were observed with the naked eye or a microscope and evaluated by A, B, C, and D. In evaluation grades below, A and B mean faultless.
< Evaluation grade of bending processability>
A: Good
B: Small wrinkles
C: large wrinkles
D: Cracks
Results of Sample 1 of the present invention and Samples 11 and 12 of Comparative Examples 11 and 12 obtained at 90° and 180° were illustrated in FIG. 1. As shown in FIG. 1, Sample 1 according to the present invention exhibits excellent bending processability at 90° and 180°, when compared with Samples 11 and 12 of Comparative Examples 11 and 12.
Test Example 2: softening resistance test
A softening resistance test was carried out in the same manner as in the bending processability test. As samples, a central portion (width of 30 mm x length of 10 mm) of each of the copper alloy materials prepared according to the example and comparative examples was cut. Hardness of the samples was measured at room temperature (25℃) and after heating of 15 minutes at an interval of 50℃ from 100℃, while observing softening temperature of rolling strips. Results are illustrated in FIG. 2. In FIG. 2, X axis represents temperature, Y axis represents hardness, and graphs represent hardness measured after maintaining 15 minutes at a related temperature and cooling. In particular, as illustrated in FIG. 2, it can be confirmed that Sample 1 (softening initiation temperature: approximately 400℃) of Example 1 of the present invention exhibits excellent softening resistance, when compared with Samples 11 and 12 (softening initiation temperatures: approximately 300℃and 350℃) of Comparative Examples 11 and 12. Difference between a softening resistance temperature of Sample 1 prepared according to Example 1 and softening resistance temperatures of Sample 11 and 12 prepared according to Comparative Examples 11 and 12 is approximately 50 to 100℃. Due to such difference, when the sample according to Example 1 is applied to a connector for vehicles, excellent softening resistance is exhibited in spite of repeatedly zero stress and, thus, may be more stably used than existing brass and phosphor bronze. When Sample 11 and 12 are used in currently used connectors, each of softening resistance temperatures thereof is 300℃ and 350℃ and, thus, signal short circuit due to softening at a contact portion of a connector may occur.
Test Example 3: dezincification test
Dezincification test for each sample was carried out in accordance with ISO-6509 test in the same manner as the method of preparing samples in the softening resistance test of the Test Example 1. The samples were perpendicularly soaked in an aqueous copper chloride solution of 1.0% m/m which is a mixture of distilled water and copper chloride (CuCl2) for 24 hours. Subsequently, the samples were sectioned and corroded depths thereof were measured and evaluated. Obtained results are illustrated in FIG. 3. As shown in FIG. 3, Sample 1 of Example 1 does not exhibit dezincification (0 mm). Therefore, it is confirmed that Sample 1 of Example 1 exhibits excellent dezincification characteristics, when compared with Sample 11 and 12 of Comparative Examples 11 and 12.
Dezincification of brass weakens strength of a contact portion and, as such, in the case of vehicles, momentary short circuit of a connector contact portion may occur, resulting in fire. Copper alloy prepared according to the present invention does not exhibit dezincification even under a corrosive environment and, as such, may maintain a surface of a connector even under corrosive environment when prepared into the connector. Accordingly, reliability of an electrical contact portion may be guaranteed.
As described above, the copper alloy material for vehicle connectors according to the present invention satisfies high strength, high thermal resistance, high corrosion resistance, and bending processability due to addition of specific amounts of Fe, Sn, and Ni to Cu-Zn based alloy. The connector material for vehicles and the like useable under severe atmosphere may be prepared.
Various embodiments have been described in the best mode for carrying out the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (7)
- A copper alloy material for vehicle connectors having high strength, high thermal resistance, high corrosion resistance and bending processability, the copper alloy material comprising 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, the remainder of Cu, and unavoidable impurities, based on 100 wt%.
- The copper alloy material according to Claim 1, further comprising one element or more selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less.
- The copper alloy material according to Claim 1, wherein the copper alloy material has a tensile strength of 560 to 650 N/mm2, an electrical conductivity of 10 to 25 %IACS, an elongation percentage of 7 to 15%, a softening resistance temperature of 400℃ or more, a corrosion depth of 0.1 mm at a corrosion resistance test, and faultless bending processability at 90° and 180°.
- A method of preparing a copper alloy material having high strength, high thermal resistance, high corrosion resistance, and excellent bending processability, the method comprising obtaining molten metal comprising 5.0 to 40.0 wt% of Zn, 0.5 to 5.0 wt% of Fe, 0.5 to 2.0 wt% of Sn, 0.01 to 0.3 wt% of Ni, the remainder of Cu, and unavoidable impurities based on 100 wt%, obtaining ingot from the molten metal, hot rolling by heating the ingot to 850 to 950℃, first cold rolling, heat treating at 400 to 500℃ for 5 to 10 hours to remove stress, subsequent cold rolling, and annealing at 600 to 800℃ for 10 to 60 seconds.
- The method according to Claim 4, wherein the molten metal further comprises one element or more selected from the group consisting of Si, P, Al, Mg, and Ca in an amount of 1 wt% or less.
- The method according to Claim 4, wherein the subsequent cold rolling and annealing at 600 to 800℃ for 10 to 60 seconds are repeatedly carried out to prepare a final copper alloy material having a desired thickness.
- The method according to Claim 4, wherein the copper alloy material has a tensile strength of 560 to 650 N/mm2, an electrical conductivity of 10 to 25 %IACS, an elongation percentage of 7 to 15%, a softening resistance temperature of 400℃ or more, a corrosion depth of 0.1 mm at a corrosion resistance test, and faultless bending processability at 90° and 180°.
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| KR10-2014-0138095 | 2014-10-14 | ||
| KR1020140138095A KR20160043674A (en) | 2014-10-14 | 2014-10-14 | Copper alloy material for connectors with high strength, high thermal resistance and high corrosion resistance, and excellent bending processiblity, and method for producing same |
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| CN113046594A (en) * | 2021-03-11 | 2021-06-29 | 郑州大学 | High-strength high-thermal-conductivity copper alloy material roller sleeve and preparation method thereof |
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| KR102492525B1 (en) * | 2020-06-16 | 2023-01-30 | 허세갑 | A manufacturing method of brass having anti-corrosion |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100329153B1 (en) * | 1998-07-08 | 2002-03-21 | 구마모토 마사히로 | Copper alloy for terminals and connectors and method for making same |
| JP2002294364A (en) * | 2001-03-30 | 2002-10-09 | Kobe Steel Ltd | Copper alloy sheet or bar for electronic and electrical parts and production method therefor |
| JP3798260B2 (en) * | 2001-05-17 | 2006-07-19 | 株式会社神戸製鋼所 | Copper alloy for electric and electronic parts and electric and electronic parts |
| JP2008231492A (en) * | 2007-03-20 | 2008-10-02 | Dowa Metaltech Kk | Cu-Ni-Sn-P BASED COPPER ALLOY SHEET AND ITS MANUFACTURING METHOD |
| KR20120011309A (en) * | 2009-05-19 | 2012-02-07 | 도와 메탈테크 가부시키가이샤 | Copper alloy sheet and method for producing same |
-
2014
- 2014-10-14 KR KR1020140138095A patent/KR20160043674A/en not_active Application Discontinuation
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2015
- 2015-10-13 WO PCT/KR2015/010787 patent/WO2016060444A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100329153B1 (en) * | 1998-07-08 | 2002-03-21 | 구마모토 마사히로 | Copper alloy for terminals and connectors and method for making same |
| JP2002294364A (en) * | 2001-03-30 | 2002-10-09 | Kobe Steel Ltd | Copper alloy sheet or bar for electronic and electrical parts and production method therefor |
| JP3798260B2 (en) * | 2001-05-17 | 2006-07-19 | 株式会社神戸製鋼所 | Copper alloy for electric and electronic parts and electric and electronic parts |
| JP2008231492A (en) * | 2007-03-20 | 2008-10-02 | Dowa Metaltech Kk | Cu-Ni-Sn-P BASED COPPER ALLOY SHEET AND ITS MANUFACTURING METHOD |
| KR20120011309A (en) * | 2009-05-19 | 2012-02-07 | 도와 메탈테크 가부시키가이샤 | Copper alloy sheet and method for producing same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113046594A (en) * | 2021-03-11 | 2021-06-29 | 郑州大学 | High-strength high-thermal-conductivity copper alloy material roller sleeve and preparation method thereof |
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