CN102319901B - Preparation method for silver cadmium oxide electrical contact - Google Patents
Preparation method for silver cadmium oxide electrical contact Download PDFInfo
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- CN102319901B CN102319901B CN 201110320475 CN201110320475A CN102319901B CN 102319901 B CN102319901 B CN 102319901B CN 201110320475 CN201110320475 CN 201110320475 CN 201110320475 A CN201110320475 A CN 201110320475A CN 102319901 B CN102319901 B CN 102319901B
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Abstract
The invention discloses a preparation method for a silver cadmium oxide electrical contact. The method comprises the following steps of: forming a pressed blank in a die pressing mode by adopting silver cadmium 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 under the hydrogen atmosphere at the temperature of between 350 and 600 DEG C, 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; for obtaining the silver cadmium oxide electrical contact with high compactness, sintering the internal oxidized blank at the temperature of between 700 and 900 DEG C in the air; and performing hot re-pressing 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 cadmium oxide particles 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 a 'depleted oxide bright band'.
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 cadmium 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 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 out 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, it is entirely ineffective namely to electrically contact function, and 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 cadmium oxide electrical contact product, improve the silver cadmium oxide electrical 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 silver cadmium oxide electrical 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, the technical solution of the utility model is may further comprise the steps:
May further comprise the steps:
(1) take by weighing with it corresponding AgCd alloyed powder according to the required weight of AgCdO contact, adopt die forming, obtain pressed compact, 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; This arranges the silver-cadmium alloy powder is reduced processing, strengthens its surface-active, make simultaneously the silver-cadmium alloy 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, 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-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, and the pressure of hydraulic press 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-cadmium alloy pressed compact of the saturating 3mm of oxygen.
In order to obtain the silver cadmium oxide electrical 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, 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 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 AgCd to prepare the product of AgCdO (12), good according to the AgCd weight weighing of the required 39.7g 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 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.
The material property that present embodiment obtains is: resistivity: 2.3 μ Ω cm; Hardness: 107HV; Density: 9.82g/cm
3
Embodiment two
1. adopt atomized alloy powder AgCd to prepare the product of AgCdO (12), good according to the AgCd weight weighing of the required 39.7g 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 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.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: 2.11 μ Ω cm; Hardness: 115HV; Density: 9.88g/cm
3
Embodiment three
1. adopt atomized alloy powder AgCd to prepare the product of AgCdO (12), good according to the AgCd weight weighing of the required 39.7g 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, 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: 2.2 μ Ω cm; Hardness: 120HV; Density: 9.8g/cm
3
Claims (3)
1. the preparation method of a silver cadmium oxide electrical contact is characterized in that may further comprise the steps:
(1) take by weighing with it corresponding AgCd alloyed powder according to the required weight of AgCdO contact, adopt die forming, obtain pressed compact, 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, 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-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, and the pressure of hydraulic press 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 cadmium 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 cadmium 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-cadmium alloy pressed compact of the saturating 3mm of oxygen.
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| CN 201110320475 CN102319901B (en) | 2011-10-20 | 2011-10-20 | Preparation method for silver cadmium oxide electrical contact |
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| CN 201110320475 CN102319901B (en) | 2011-10-20 | 2011-10-20 | Preparation method for silver cadmium oxide electrical contact |
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| CN102319901B true CN102319901B (en) | 2013-04-24 |
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| 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 |
| CN112643162B (en) * | 2020-11-30 | 2022-06-28 | 浙江福达合金材料科技有限公司 | Welding method of industrial plug and socket contact assembly |
| CN112831681B (en) * | 2020-12-30 | 2021-12-21 | 宁波东大神乐电工合金有限公司 | Powder metallurgy method silver cadmium oxide electrical contact material and manufacturing process thereof |
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| JPH0336223A (en) * | 1989-06-30 | 1991-02-15 | Tanaka Kikinzoku Kogyo Kk | Silver-cadmium oxide series electrical contact material and its manufacture |
| CN101651051B (en) * | 2009-07-20 | 2011-05-04 | 温州宏丰电工合金股份有限公司 | Cadmium-oxygen-silver multicomponent electrical contact material and preparation method thereof |
| CN101651054B (en) * | 2009-09-11 | 2012-11-21 | 昆明理工大学 | Preparation method of modified AgSnO2 electric contact material |
| CN102151830B (en) * | 2011-03-08 | 2012-08-29 | 郴州雄风稀贵金属材料股份有限公司 | Preparation method of silver-rare earth refractory metal oxide electrical contact material |
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Effective date of registration: 20220128 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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