CN102328086A - Method for preparing silver tin oxide electrical contact - Google Patents
Method for preparing silver tin oxide electrical contact Download PDFInfo
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- CN102328086A CN102328086A CN201110320188A CN201110320188A CN102328086A CN 102328086 A CN102328086 A CN 102328086A CN 201110320188 A CN201110320188 A CN 201110320188A CN 201110320188 A CN201110320188 A CN 201110320188A CN 102328086 A CN102328086 A CN 102328086A
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- tin oxide
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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 manufacturing approach of the electrical contact of low-pressure electronic equipment product, be meant a kind of preparation method of siller tin oxide electric contact especially.
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-galvano-cautery again; But fine silver hardness is low; Anti-electrical wear ability is relatively poor, therefore in silver matrix, generally needs to add MeO (metal oxide) second phase, just can prepare good, anti-electrical arc erosion of the resistance fusion welding that satisfies contact material and the good instructions for use of mar proof.
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 alloy of siluer metal oxide with the melting mode earlier; Then alloy and fine silver (or silver alloy) are combined into the sheet material or the band of double-layer structure; Sheet material or band become the thickness of final products through rolling process; Punching out becomes the contact blade of client's required 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: can't avoid " poor oxide bright band " phenomenon in the middle of the silver oxide that alloy inner oxidation technology 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; 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, and it is entirely ineffective promptly to electrically contact function, 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 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 that prior art exists; And a kind of preparation method of new siller tin oxide electric contact is provided; Make it have the high advantage of the tiny all even powder metallurgical technique stock utilization 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, technical scheme of the present invention is may further comprise the steps:
(1) according to AgSnO
2The required weight of contact takes by weighing corresponding with it 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 ℃ handled 1～3 hour, take out the cooling back; This is provided with silver-colored ashbury metal powder is reduced processing, strengthens its surface-active, makes the further even diffused of silver-colored ashbury metal powder simultaneously, forms continuous porous body, for interior oxidizing 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 oxidation furnace of 0.02～1.5MPa, temperature is controlled in 500～750 ℃, and 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-up temperature, temperature retention 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 mold temperature stable; Is 6～14T with the pressure of hydraulic press according to specific mo(u)lding pressure, is adjusted to required pressure, and the multiple pressed compact of treating of step (5) heating is put into multiple pressing mold tool and suppressed, and obtains fine and close finished product.
Further being provided with is that described reducing atmosphere 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 ashbury metal pressed compact of 3mm by oxygen in 16～24 hours.
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 hot re-pressing again 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 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 bright band, thus 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;
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 the Figure of description and the specific 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).
The specific 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 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 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 oxidation furnace 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: 2.25 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 handled the taking-up of cooling back 2 hours in 550 ℃;
3. will pass through the base substrate of hydrogen atmosphere processing and insert in the interior oxidation furnace 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, and referring to Fig. 1, visible particle is tiny, metallographic structure is even, and does not have " poor oxide bright band " to exist.
The material property that present embodiment obtained 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 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 oxidation furnace 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.
The material property that present embodiment obtained 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 corresponding with it 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 ℃ 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 oxidation furnace of 0.02～1.5MPa, temperature is controlled in 500～750 ℃, and 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-up temperature, temperature retention 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 stabilization; Is 6～14T with the pressure of hydraulic press according to specific mo(u)lding pressure, is adjusted to required pressure, and the multiple pressed compact of treating of step (5) heating is put into multiple pressing mold tool and suppressed, and obtains 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 said step (2) is a hydrogen atmosphere.
3. the preparation method of a kind of siller tin oxide electric contact according to claim 1 is characterized in that: the interior oxidization time foundation of described step (3): can pass through the thick silver-colored ashbury metal pressed compact of 3mm by oxygen in 16～24 hours.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN108140971A (en) * | 2015-10-20 | 2018-06-08 | 株式会社自动网络技术研究所 | Terminal metallic plate, terminal and terminal pair |
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| US4131458A (en) * | 1976-10-21 | 1978-12-26 | National Research Institute For Metals | Electrical contact material of silver base alloy |
| CN101034631A (en) * | 2007-04-05 | 2007-09-12 | 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 |
| 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 201110320188 patent/CN102328086B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4131458A (en) * | 1976-10-21 | 1978-12-26 | National Research Institute For Metals | Electrical contact material of silver base alloy |
| CN101034631A (en) * | 2007-04-05 | 2007-09-12 | 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 |
| 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)
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| 庄思云、陈宝全: "AF法生产银氧化镉电触头工艺实践", 《低压电器》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108140971A (en) * | 2015-10-20 | 2018-06-08 | 株式会社自动网络技术研究所 | Terminal metallic plate, terminal and terminal pair |
| CN108140971B (en) * | 2015-10-20 | 2021-05-11 | 株式会社自动网络技术研究所 | Metal plate for terminal, and terminal pair |
| 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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| CN102328086B (en) | 2013-04-17 |
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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. |