CN102328086B - Method for preparing silver tin oxide electrical contact - Google Patents
Method for preparing silver tin oxide electrical contact Download PDFInfo
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- CN102328086B CN102328086B CN 201110320188 CN201110320188A CN102328086B CN 102328086 B CN102328086 B CN 102328086B CN 201110320188 CN201110320188 CN 201110320188 CN 201110320188 A CN201110320188 A CN 201110320188A CN 102328086 B CN102328086 B CN 102328086B
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Abstract
The invention discloses a method for preparing a silver tin oxide electrical contact. The method comprises the following steps of: forming a pressed blank by using silver and tin alloy powder through a die pressing mode, wherein the relative density of the pressed blank is 65 to 85 percent; treating the formed pressed blank under a hydrogen atmosphere at 350 to 600 DEG C for 1 to 3 hours; then placing the treated pressed blank into an oxidization furnace with oxygen pressure of 0.02 to 1.5 Mpa and temperature of 500 to 750 DEG C for oxidization; and in order to obtain the silver tin oxide electrical contact with high density, sintering a blank body subjected to inner oxidization in air at 700 to 900 DEG C, thermally repressing the blank body at 500 to 900 DEG C, and thus obtaining the electrical contact product with the relative density of over 99 percent. The silver tin oxide electrical contact prepared by using the method has small silver tin oxide particles and uniform metallographic structure and has the advantages of an inner oxidization process; and a 'poor oxide bright band' does not exist.
Description
Technical field
The present invention relates to the manufacture method of the electrical contact of low-pressure electronic equipment product, refer to especially a kind of preparation method of siller tin oxide electric contact.
Background technology
At present the electric equipment products of the medium and small electric current of low voltage electrical apparatus industry greatly mainly with silver-based material as contact material, silver-based material has good electric conductivity thermal conductivity, has certain anti-galvano-cautery again, but fine silver hardness is low, anti-electrical wear ability is relatively poor, therefore in silver matrix, generally need to add the MeO(metal oxide) second-phase, just can prepare the good instructions for use of good, the anti-electrical arc erosion of the resistance fusion welding that satisfies contact material and mar proof.
The technique of usually producing this siluer metal oxide electric contact employing has two kinds:
Powder metallurgic method;
Alloy inner oxidation technique.
Wherein powder metallurgic method comprises powder mixing machine technique and alloy powder pre-oxidation process, wherein there is the thick shortcoming of metallographic structure uneven grain in the electrical contact of powder mixing machine technique preparation, thereby have influence on the electric life of contact, and the electrical contact of alloy powder pre-oxidation process preparation, although particle is tiny, but the phenomenon of oxide buildup is apparent in view, and electrical and thermal conductivity performance is poor.
Alloy inner oxidation technique is to produce the silver alloy corresponding with siluer metal oxide with the melting mode first, then alloy and fine silver (or silver alloy) are combined into sheet material or the band of double-layer structure, sheet material or band become the thickness of final products through rolling process, then punching becomes the contact blade of client's required size size, does not wait to tens hours in 500-750 ℃ of continuous oxidation several hours in normal pressure or hyperbaric oxygen atmosphere at last.This method for preparing the silver oxide contact is referred to as the alloy inner oxidation method.The method technique is simple, at present by a large amount of employings, but the critical defect of this method is: can't avoid " oxygen deprivation compound bright band " phenomenon in the middle of the silver oxide that alloy inner oxidation technique must occur, in the formation of poor oxide strip and the silver alloy oxidizing process alloying element to external diffusion simultaneously oxygen a homeostasis process spreading of layer is relevant from outside to inside.Evidence suggests, the contact that the alloy inner oxidation method is produced is in the switch use procedure, repeatedly frequently arcing make the silver oxide layer wear up in the middle of near the poor oxide strip time, this contact material will cause contact sticking dead because of oxide-free arc extinguishing or anti electric arc corrosion effect, namely electrically contact function entirely ineffective, this just means will have the silver oxide layer that accounts for about a half thickness to be wasted.In addition, also there is the long problem of oxidation cycle in this alloy inner oxidation technique, the product needed tens that the saturating 3mm of oxygen is thick even more than 100 hours, and production efficiency is low, and production cost is high, produces power consumption high.
Therefore, can improve simultaneously and solve the problem that above-mentioned several technique exists in producing the siller tin oxide electric contact product, improve the siller tin oxide electric contact properties of product and just have important actual application value.
Summary of the invention
The objective of the invention is in order to overcome the shortcoming and defect of prior art existence, and provide a kind of preparation method of new siller tin oxide electric contact, make it have the high advantage of the tiny all even powder metallurgical technique stock utilizations of internal oxidation process particle concurrently, can avoid or improve internal oxidation process fully simultaneously and have " poor oxide region " and the low density shortcoming of powder metallurgical technique.
For achieving the above object, technical scheme of the present invention is may further comprise the steps:
(1) according to AgSnO
2The required weight of contact takes by weighing with it corresponding AgSn alloyed powder, adopts die forming, obtains pressed compact, and first pressing pressed compact relative density is controlled between 65～85%;
(2) pressed compact is put under the reducing atmosphere in 350～600 ℃ and processed 1～3 hour, take out after the cooling; This arranges silver-colored ashbury metal powder is reduced processing, strengthens its surface-active, make simultaneously silver-colored ashbury metal powder further diffusion evenly forms continuous porous body, for interior oxidizing process is raised the efficiency, the shortening oxidization time.
(3) will insert oxygen through the base substrate that step (2) is processed and press in the interior oxidation furnace of 0.02～1.5MPa, temperature is controlled in 500～750 ℃, and oxidization time is decided on first pressing pressed compact thickness, obtains molding blank;
(4) with molding blank in air in 700～900 ℃ of sintering 2～4 hours, obtain sintered blank;
(5) sintered blank is heated, 500～900 ℃ in heating-up temperature interval, temperature retention time 10～30 minutes obtains to treat multiple pressed compact;
(6) will answer compression mould and be heated to a certain temperature between 200～500 ℃, and keep mold temperature stable; Be 6～14T with the pressure of hydraulic press according to specific mo(u)lding pressure, be adjusted to required pressure, the multiple pressed compact for the treatment of of step (5) heating is put into multiple compression mould and suppressed, obtain fine and close finished product.
Further arranging is that described reducing atmosphere is hydrogen atmosphere.
Further arranging is the interior oxidization time foundation of described step (3): 16～24 hours can the thick silver-colored ashbury metal pressed compact of the saturating 3mm of oxygen.
In order to obtain the siller tin oxide electric contact product of high-compactness, base substrate through interior oxidation is carried out sintering processes in 700～900 ℃ add again hot re-pressing in air, reach more than 99% thereby obtain relative density,, electrical contact product that the metallographic structure single-size is tiny.
The application compares with powder metallurgical technique with traditional alloy inner oxidation technique, and the method is produced electrical contact except the advantage that has said two devices concurrently, also has the following advantages:
Without the existence of oxygen deprivation compound bright band, thereby improved electrical contact material utilization rate and service life;
Pressed compact carries out DIFFUSION TREATMENT under hydrogen atmosphere, the product metallographic structure of final production is even, particle is tiny, the oxide-free clustering phenomena;
Adopt oxidation in the continuous poriferous base substrate, improved interior oxidation efficiency, shorten oxidization time, thereby reduce energy consumption, save cost.
Below in conjunction with specification drawings and specific embodiments the present invention is done further introduction.
Description of drawings
The finished product metallograph of Fig. 1 embodiment of the invention 1 (200 times of amplifications).
The specific embodiment
Below by embodiment the present invention is carried out concrete description; only be used for the present invention is further specified; can not be interpreted as the restriction to protection domain of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.
Embodiment one
1. adopt atomized alloy powder AgSn to prepare AgSnO
2(12) product, good according to the AgSn weight weighing of the required 38.3g of theory, adopt compression molding, the relative density of first pressing pressed compact is 65%;
2. pressed compact is put under the hydrogen atmosphere and processed taking-up after the cooling 2 hours in 450 ℃;
3. will insert oxygen through the base substrate that hydrogen atmosphere is processed and press in the interior oxidation furnace of 0.95MPa, temperature is controlled at 700 ℃, oxidation 24 hours;
4. the base substrate after the oxidation was heated 880 ℃ of sintering 4 hours in air;
5. the base substrate behind the sintering is heated to 860 ℃ again in air, and is incubated 15 minutes, will answer simultaneously compression mould and be heated to 300 ℃ and insulation;
6. the base substrate of heating is put into die cavity and suppressed, specific mo(u)lding pressure 12T, and 5～10 seconds of pressurize take out product after the release.
The material property that the present embodiment obtains is: resistivity: 2.25 μ Ω cm; Hardness: 107HV; Density: 9.82g/cm
3
Embodiment two
1. adopt atomized alloy powder AgSn to prepare AgSnO
2(12) product, good according to the AgSn weight weighing of the required 38.3g of theory, adopt compression molding, the relative density of first pressing pressed compact is 75%;
2. pressed compact is put under the hydrogen atmosphere and processed taking-up after the cooling 2 hours in 550 ℃;
3. will insert oxygen through the base substrate that hydrogen atmosphere is processed and press in the interior oxidation furnace of 0.95MPa, the temperature general control is at 700 ℃, oxidation 24 hours;
4. the base substrate after the oxidation was heated 880 ℃ of sintering 4 hours in air;
5. the base substrate behind the sintering is heated to 860 ℃ again in air, and is incubated 15 minutes, will answer simultaneously compression mould and be heated to 300 ℃;
6. the base substrate of heating is put into die cavity and suppressed, specific mo(u)lding pressure 12T, and 5～10 seconds of pressurize take out product after the release, and referring to Fig. 1, visible particle is tiny, metallographic structure is even, and does not have " oxygen deprivation compound bright band " to exist.
The material property that the present embodiment obtains is: resistivity: 2.1 μ Ω cm; Hardness: 117HV; Density: 9.82g/cm
3
Embodiment three
1. adopt atomized alloy powder AgSn to prepare AgSnO
2(12) product, good according to the AgSn weight weighing of the required 38.3g of theory, adopt compression molding, the relative density of first pressing pressed compact is 85%;
2. pressed compact is put under the hydrogen atmosphere and processed taking-up after the cooling 2 hours in 600 ℃;
3. will insert oxygen through the base substrate that hydrogen atmosphere is processed and press in the interior oxidation furnace of 0.95MPa, the temperature general control is at 700 ℃, oxidation 24 hours;
4. the base substrate after the oxidation was heated 880 ℃ of sintering 4 hours in air;
5. the base substrate behind the sintering is heated to 860 ℃ again in air, and is incubated 15 minutes, will answer simultaneously compression mould and be heated to 300 ℃;
6. the base substrate of heating is put into die cavity and suppressed, specific mo(u)lding pressure 12T, and 5～10 seconds of pressurize take out product after the release.
The material property that the present embodiment obtains is: resistivity: 2.3 μ Ω cm; Hardness: 112HV; Density: 9.79g/cm
3
Claims (3)
1. the preparation method of a siller tin oxide electric contact is characterized in that may further comprise the steps:
(1) according to AgSnO
2The required weight of contact takes by weighing with it corresponding AgSn alloyed powder, adopts die forming, obtains pressed compact, and first pressing pressed compact relative density is controlled between 65～75%;
(2) pressed compact is put under the reducing atmosphere in 350～600 ℃ and processed 1～3 hour, take out after the cooling;
(3) will insert oxygen through the base substrate that step (2) is processed and press in the interior oxidation furnace of 0.02～1.5MPa, temperature is controlled in 500～750 ℃, and oxidization time is decided on first pressing pressed compact thickness, obtains molding blank;
(4) with molding blank in air in 700～900 ℃ of sintering 2～4 hours, obtain sintered blank;
(5) sintered blank is heated, 500～900 ℃ in heating-up temperature interval, temperature retention time 10～30 minutes obtains to treat multiple pressed compact;
(6) will answer compression mould and be heated to a certain temperature between 200～500 ℃, and keep multiple compression mould temperature stabilization; Be 6～14T with the pressure of hydraulic press according to specific mo(u)lding pressure, be adjusted to required pressure, the multiple pressed compact for the treatment of of step (5) heating is put into multiple compression mould and suppressed, obtain fine and close finished product.
2. the preparation method of a kind of siller tin oxide electric contact according to claim 1, it is characterized in that: the reducing atmosphere of described step (2) is hydrogen atmosphere.
3. the preparation method of a kind of siller tin oxide electric contact according to claim 1, it is characterized in that: the interior oxidization time foundation of described step (3): 16～24 hours can the thick silver-colored ashbury metal pressed compact of the saturating 3mm of oxygen.
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| CN 201110320188 CN102328086B (en) | 2011-10-20 | 2011-10-20 | Method for preparing silver tin oxide electrical contact |
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| CN 201110320188 CN102328086B (en) | 2011-10-20 | 2011-10-20 | Method for preparing silver tin oxide electrical contact |
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| CN102328086B true CN102328086B (en) | 2013-04-17 |
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| CN104831105B (en) * | 2015-03-26 | 2016-10-12 | 昆明理工大学 | A kind of preparation method of multilamellar Ni/AgMeO electrical contact material |
| JP6497293B2 (en) * | 2015-10-20 | 2019-04-10 | 株式会社オートネットワーク技術研究所 | Metal plate for terminals, terminals and terminal pairs |
| CN105374598A (en) * | 2015-11-05 | 2016-03-02 | 福达合金材料股份有限公司 | Manufacturing method for coarse oxide particle silver-based electric contact materials |
| CN107064140A (en) * | 2017-03-17 | 2017-08-18 | 浙江工业大学 | Ag Sn In alloy differential pressure internal oxidition method of testings |
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| JPS5351128A (en) * | 1976-10-21 | 1978-05-10 | Nat Res Inst Metals | Electric contact materials |
| CN100498993C (en) * | 2007-04-05 | 2009-06-10 | 章景兴 | Electrical contact material based on the AgSnO2 and ytterbia and its production technique |
| CN101202169A (en) * | 2007-10-23 | 2008-06-18 | 福达合金材料股份有限公司 | Method of preparing novel silver tin oxide silk electrical contact material |
| CN101651054B (en) * | 2009-09-11 | 2012-11-21 | 昆明理工大学 | Preparation method of modified AgSnO2 electric contact material |
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Effective date of registration: 20220130 Address after: 325025 No. 308, Binhai fifth road, Wenzhou Economic and Technological Development Zone, Wenzhou City, Zhejiang Province Patentee after: Zhejiang Fuda alloy material technology Co.,Ltd. Address before: No. 518, Binhai 4th Road, Binhai Park, Wenzhou Economic and Technological Development Zone, Zhejiang Province, 325000 Patentee before: FUDA ALLOY MATERIALS Co.,Ltd. |
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