CN102330008B - Preparation method for silver zinc oxide electrical contact - Google Patents
Preparation method for silver zinc oxide electrical contact Download PDFInfo
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- CN102330008B CN102330008B CN 201110320191 CN201110320191A CN102330008B CN 102330008 B CN102330008 B CN 102330008B CN 201110320191 CN201110320191 CN 201110320191 CN 201110320191 A CN201110320191 A CN 201110320191A CN 102330008 B CN102330008 B CN 102330008B
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Abstract
The invention discloses a preparation method for a silver zinc oxide electrical contact. The method comprises the following steps of: forming a pressed blank in a die pressing mode by adopting silver zinc alloy powder, wherein the relative density of the pressed blank is 65 to 80 percent; treating the formed pressed blank for 1 to 3 hours at the temperature of between 350 and 600 DEG C in hydrogen atmosphere, putting the treated pressed blank into an oxidation furnace with oxygen pressure of 0.02 to 1.5MPa and temperature of 500 to 750 DEG C, and performing oxidation; and for obtaining the high-compactness silver zinc oxide electrical contact, sintering the internal oxidized blank in the air at the temperature of between 700 and 900 DEG C, performing hot repressing on the blank at the temperature of between 500 and 900 DEG C, and thus obtaining an electrical contact product with relative density of over 99 percent. The silver zinc oxide granules prepared by the method are fine and uniform in metallographic structure; and the method has the advantages of an internal oxidation process and does not produce 'poor oxide bright bands'.
Description
Technical field
The present invention relates to a kind of preparation technology of the electrical contact material for low-pressure electronic equipment product, specifically refer to a kind of preparation method of silver zinc oxide electrical 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 electroconductibility thermal conductivity, has certain anti-electrocorrosion 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 service requirements of good, the anti-electrical arc erosion of the resistance fusion welding that satisfies contact material and wearability.
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 alloys corresponding with siluer metal oxide with the melting mode first, then alloy and fine silver (or silver alloys) are combined into sheet material or the band of double-layer structure, sheet material or band become the thickness of the finished product through rolling process, then punching out becomes the contact blade of client's desired 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: middle " the oxygen deprivation compound bright band " phenomenon of the silver oxide that can't avoid alloy inner oxidation technique to occur, a layer homeostasis process that spreads is relevant from outside to inside to external diffusion while oxygen with silver alloys oxidising process interalloy element in the formation of poor oxide strip.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 complete failure, 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, and it is high to produce power consumption.
Therefore, can improve simultaneously and solve the problem that above-mentioned several technique exists in producing the silver zinc oxide electrical contact product, improve the silver zinc oxide electrical contact product performance 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 silver zinc oxide electrical contact, make it have the high advantage of the tiny all even powder metallurgical technique material use efficiencys 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, the technical solution of the utility model is may further comprise the steps:
(1) take by weighing with it corresponding AgZn alloy powder according to the required weight of AgZnO contact, adopt die forming, obtain pressed compact, first pressing pressed compact relative density is controlled between 65～80%;
(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 Zinc alloy powder is reduced processing, strengthens its surfactivity, make simultaneously silver-colored Zinc alloy powder further diffusion evenly forms continuous porous insert, for interior oxidising 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 oxidized still of 0.02～1.5MPa, the temperature general control is at 500～750 ℃, and interior 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 temperature interval, soaking 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-stable, and the pressure of hydropress is adjusted to required pressure, specific mo(u)lding pressure is 6～14T, to treat that multiple pressed compact puts into mould and suppress, obtain fine and close finished product.
Further setting is that the reducing atmosphere of described step (2) is hydrogen atmosphere.
Further arranging is the interior oxidization time foundation of described step (3): 16～24 hours can the thick silver-colored zinc alloy pressed compact of the saturating 3mm of oxygen.
In order to obtain the silver zinc oxide electrical contact product of high-compactness, base substrate through interior oxidation is carried out sintering processes in 700～900 ℃ reheat multiple pressure in air, thereby obtain relative density and reach more than 99% the electrical contact product that the metallographic structure single-size is tiny.
Compare with powder metallurgical technique with alloy inner oxidation technique, 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 ratio and work-ing 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).
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 AgZn to prepare the product of AgZnO (12), good according to the AgZn weight weighing of the required 37.6g 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 oxidized still 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 present embodiment obtains is: resistivity: 2.3 μ Ω cm; Hardness: 107HV; Density: 9.8g/cm
3
Embodiment two
1. adopt atomized alloy powder AgZn to prepare the product of AgZnO (12), good according to the AgZn weight weighing of the required 37.6g 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 500 ℃;
3. will insert oxygen through the base substrate that hydrogen atmosphere is processed and press in the interior oxidized still 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.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 present embodiment obtains is: resistivity: 2.3 μ Ω cm; Hardness: 114HV; Density: 9.82g/cm
3
Embodiment three
1. adopt atomized alloy powder AgZn to prepare the product of AgZnO (12), good according to the AgZn weight weighing of the required 37.6g 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 oxidized still 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 14T, and 5～10 seconds of pressurize take out product after the release.The material property that present embodiment obtains is: resistivity: 2.5 μ Ω cm; Hardness: 120HV; Density: 9.85g/cm
3
Claims (3)
1. the preparation method of a silver zinc oxide electrical contact is characterized in that may further comprise the steps:
(1) take by weighing with it corresponding AgZn alloy powder according to the required weight of AgZnO contact, adopt die forming, obtain pressed compact, first pressing pressed compact relative density is controlled between 65～80%;
(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 oxidized still of 0.02～1.5MPa, the temperature general control is at 500～750 ℃, and interior 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 temperature interval, soaking 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-stable, and the pressure of hydropress is adjusted to required pressure, specific mo(u)lding pressure is 6～14T, to treat that multiple pressed compact puts into mould and suppress, obtain fine and close finished product.
2. the preparation method of a kind of silver zinc oxide electrical 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 silver zinc oxide electrical 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 zinc alloy pressed compact of the saturating 3mm of oxygen.
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| CN 201110320191 CN102330008B (en) | 2011-10-20 | 2011-10-20 | Preparation method for silver zinc oxide electrical contact |
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| CN 201110320191 CN102330008B (en) | 2011-10-20 | 2011-10-20 | Preparation method for silver zinc oxide electrical contact |
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| CN102330008B true CN102330008B (en) | 2013-02-27 |
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| CN104493178B (en) * | 2014-12-30 | 2016-09-14 | 桂林电器科学研究院有限公司 | A kind of processing method of the silver zinc oxide electrical contact material containing additive |
| 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 |
| CN106048289B (en) * | 2016-06-30 | 2018-03-20 | 佛山市诺普材料科技有限公司 | A kind of large or fine granule collocation internal oxidation Agcdo manufacture craft |
| CN111463046B (en) * | 2020-03-07 | 2022-05-24 | 浙江福达合金材料科技有限公司 | Silver zinc oxide sheet-shaped electrical contact and preparation method thereof |
| CN113921310B (en) * | 2021-11-01 | 2024-03-26 | 西安西电高压开关有限责任公司 | Technological manufacturing method of arc contact |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651054A (en) * | 2009-09-11 | 2010-02-17 | 昆明理工大学 | Preparation method of modified AgSnO2 electric contact material |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651054A (en) * | 2009-09-11 | 2010-02-17 | 昆明理工大学 | Preparation method of modified AgSnO2 electric contact material |
Non-Patent Citations (2)
| Title |
|---|
| 吴春萍等.新工艺制备AgZnO电接触材料的组织与性能研究.《电工材料》.2007,(第3期),第3-7,16页. * |
| 赵铮等.***压实法制备纳米氧化铝弥散强化铜.《稀有金属材料与工程》.2009,第38卷第365-369页. * |
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Effective date of registration: 20220215 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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