CN102330008A - Preparation method for silver zinc oxide electrical contact - Google Patents
Preparation method for silver zinc oxide electrical contact Download PDFInfo
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- CN102330008A CN102330008A CN 201110320191 CN201110320191A CN102330008A CN 102330008 A CN102330008 A CN 102330008A CN 201110320191 CN201110320191 CN 201110320191 CN 201110320191 A CN201110320191 A CN 201110320191A CN 102330008 A CN102330008 A CN 102330008A
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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 who is used for the electrical contact material of low-pressure electronic equipment product, specifically be meant a kind of preparation method of Ag-ZnO electrical contact.
Background technology
At present the electric equipment products of the medium and small electric current of low voltage electrical apparatus industry mostly with silver-based material as contact material; Silver-based material has the good electrical conductivity 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 needs to add MeO (MOX) second phase, just can prepare good, anti-electrical arc erosion of the resistance fusion welding that satisfies contact material and the good request for utilization of wearability.
The technology of producing this siluer metal oxide electric contact employing usually has two kinds:
powder metallurgic method;
alloy inner oxidation technology.
Wherein powder metallurgic method comprises powder mixing machine technology 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 prepared; Thereby have influence on the electric life of contact, and the electrical contact of alloy powder pre-oxidation process preparation, though particle is tiny; But the phenomenon of oxide buildup is apparent in view, and electrical and thermal conductivity performance is poor.
Alloy inner oxidation technology is to produce and the corresponding silver alloys of siluer metal oxide with the melting mode earlier; Then alloy and fine silver (or silver alloys) are combined into the sheet material or the band of double-layer structure; Sheet material or band become the thickness of the finished product through rolling process; Punching out becomes the contact blade of client's desired size size then, 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.This method technology is simple; At present by a large amount of employings; But the critical defect of this method is: middle " the poor oxide compound bright band " phenomenon of the silver oxide that can't avoid alloy inner oxidation technology to occur, the formation of poor oxide strip is relevant to a homeostasis process of external diffusion oxygen layer diffusion from outside to inside simultaneously with silver alloys oxidising process interalloy element.Evidence suggests; The contact that the alloy inner oxidation method is produced is in the switch use; Frequent repeatedly 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, promptly electrically contact function complete failure, and this just means there being 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 technology, and oxygen passes through the thick product needed of 3mm tens 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 and solve the problem that above-mentioned several kinds of technologies exist simultaneously in producing Ag-ZnO electrical contact product, improve Ag-ZnO 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 that prior art exists; And a kind of preparation method of new Ag-ZnO electrical contact is provided; Make it have the high advantage of the tiny all even powder metallurgical technique material use efficiency 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 realizing above-mentioned purpose, the technical scheme of the utility model is may further comprise the steps:
(1) take by weighing corresponding with it AgZn alloy powder according to the required weight of AgZnO contact, adopt die forming, obtain pressed compact, first pressing pressed compact specific density is controlled between 65～80%;
(2) pressed compact is put under the reducing atmosphere in 350～600 ℃ handled 1～3 hour, take out the cooling back; This is provided with silver-colored Zinc alloy powder is reduced processing, strengthens its surfactivity, makes the further even diffused of silver-colored Zinc alloy powder simultaneously, forms the successive porous insert, for interior oxidising process is raised the efficiency, shortens oxidization time.
(3) will insert oxygen through the base substrate that step (2) is handled and press in the interior oxidized still of 0.02～1.5MPa, temperature generally is controlled at 500～750 ℃, and interior oxidization time is looked first pressing pressed compact thickness and decided, and 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, interval 500～900 ℃ of Heating temperature, soaking time 10～30 minutes obtains to treat multiple pressed compact;
(6) will answer the pressing mold tool and be heated to a certain temperature between 200～500 ℃; And keep multiple pressing mold tool 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 said step (2) is a hydrogen atmosphere.
Further being provided with is the interior oxidization time foundation of described step (3): can pass through the thick silver-colored zinc alloy pressed compact of 3mm by oxygen in 16～24 hours.
In order to obtain the Ag-ZnO electrical contact product of high-compactness; Base substrate through interior oxidation is carried out the sintering processes reheat in 700～900 ℃ in air press again; 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 technology; This method is produced electrical contact except the advantage that has said two devices concurrently; Also have the following advantages:
existence of no poor oxide compound bright band, thus 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;
adopts oxidation in the continuous poriferous base substrate; Improved interior oxidation efficiency; Shorten oxidization time; Thereby cut down the consumption of energy, practice thrift cost.
Below in conjunction with Figure of description and embodiment 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
Through embodiment the present invention is carried out concrete description below; Only be used for the present invention is further specified; Can not be interpreted as the qualification 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 specific density of first pressing pressed compact is 65%;
2. pressed compact is put under the hydrogen atmosphere and handled the taking-up of cooling back 2 hours in 450 ℃;
3. will pass through the base substrate of hydrogen atmosphere processing and insert in the interior oxidized still of oxygen pressure 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 the pressing mold tool simultaneously 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 obtained 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 specific density of first pressing pressed compact is 75%;
2. pressed compact is put under the hydrogen atmosphere and handled the taking-up of cooling back 2 hours in 500 ℃;
3. will pass through the base substrate of hydrogen atmosphere processing and insert in the interior oxidized still of oxygen pressure 0.95MPa, temperature generally 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 the pressing mold tool simultaneously 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 " poor oxide compound bright band " to exist.
The material property that present embodiment obtained 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 specific density of first pressing pressed compact is 85%;
2. pressed compact is put under the hydrogen atmosphere and handled the taking-up of cooling back 2 hours in 600 ℃;
3. will pass through the base substrate of hydrogen atmosphere processing and insert in the interior oxidized still of oxygen pressure 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 the pressing mold tool simultaneously 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 obtained is: resistivity: 2.5 μ Ω cm; Hardness: 120HV; Density: 9.85g/cm
3
Claims (3)
1. the preparation method of an Agcdo electrical contact is characterized in that may further comprise the steps:
(1) take by weighing corresponding with it AgCd alloy powder according to the required weight of AgCdO contact, adopt die forming, obtain pressed compact, first pressing pressed compact specific density is controlled between 65～85%;
(2) pressed compact is put under the reducing atmosphere in 350～600 ℃ handled 1～3 hour, take out the cooling back;
(3) will insert oxygen through the base substrate that step (2) is handled and press in the interior oxidized still of 0.02～1.5MPa, temperature generally is controlled at 500～750 ℃, and interior oxidization time is looked first pressing pressed compact thickness and decided, and 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, interval 500～900 ℃ of Heating temperature, soaking time 10～30 minutes obtains to treat multiple pressed compact;
(6) will answer the pressing mold tool and be heated to a certain temperature between 200～500 ℃; And keep multiple pressing mold tool 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 Agcdo electrical contact according to claim 1 is characterized in that: the reducing atmosphere of said step (2) is a hydrogen atmosphere.
3. the preparation method of a kind of Agcdo electrical contact according to claim 1 is characterized in that: the interior oxidization time foundation of described step (3): can pass through the thick silver-cadmium alloy pressed compact of 3mm by oxygen in 16～24 hours.
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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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104493178A (en) * | 2014-12-30 | 2015-04-08 | 桂林电器科学研究院有限公司 | Processing method of silver zinc oxide electric contact material containing additive |
| CN104831105A (en) * | 2015-03-26 | 2015-08-12 | 昆明理工大学 | A preparing method of multi-layer Ni/AgMeO electric contact materials |
| CN106048289A (en) * | 2016-06-30 | 2016-10-26 | 佛山市诺普材料科技有限公司 | Manufacturing process of silver-cadmium oxide with internal oxidation method by matching coarse and fine particles |
| CN111463046A (en) * | 2020-03-07 | 2020-07-28 | 福达合金材料股份有限公司 | Silver zinc oxide sheet-shaped electrical contact and preparation method thereof |
| CN113921310A (en) * | 2021-11-01 | 2022-01-11 | 西安西电高压开关有限责任公司 | Process manufacturing method of high-performance 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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2011
- 2011-10-20 CN CN 201110320191 patent/CN102330008B/en active Active
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 |
|---|
| 《电工材料》 20071231 吴春萍等 新工艺制备AgZnO电接触材料的组织与性能研究 第3-7,16页 1-3 , 第3期 * |
| 《稀有金属材料与工程》 20090430 赵铮等 爆炸压实法制备纳米氧化铝弥散强化铜 第365-369页 1-3 第38卷, * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104493178A (en) * | 2014-12-30 | 2015-04-08 | 桂林电器科学研究院有限公司 | Processing method of silver zinc oxide electric contact material containing additive |
| CN104831105A (en) * | 2015-03-26 | 2015-08-12 | 昆明理工大学 | A preparing method of multi-layer Ni/AgMeO electric contact materials |
| CN106048289A (en) * | 2016-06-30 | 2016-10-26 | 佛山市诺普材料科技有限公司 | Manufacturing process of silver-cadmium oxide with internal oxidation method by matching coarse and fine particles |
| CN111463046A (en) * | 2020-03-07 | 2020-07-28 | 福达合金材料股份有限公司 | Silver zinc oxide sheet-shaped electrical contact and preparation method thereof |
| 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 |
| CN113921310A (en) * | 2021-11-01 | 2022-01-11 | 西安西电高压开关有限责任公司 | Process manufacturing method of high-performance arc contact |
| 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 |
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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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