CN1224725C - Method for preparing silver copper oxide electric contact material - Google Patents
Method for preparing silver copper oxide electric contact material Download PDFInfo
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- CN1224725C CN1224725C CN 03134913 CN03134913A CN1224725C CN 1224725 C CN1224725 C CN 1224725C CN 03134913 CN03134913 CN 03134913 CN 03134913 A CN03134913 A CN 03134913A CN 1224725 C CN1224725 C CN 1224725C
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Abstract
The present invention relates to a method for preparing a silver copper oxide electric contact material. Silver powder, copper powder or silver-copper alloy powder is used as a raw material in which a small quantity of tungsten elements and aluminum elements as performance adjustment elements are added, a silver oxide is used as a reactant, and then a silver copper oxide electric contact material (wire) is prepared by mixing, pressed forming, reaction sintering, repressing, resintering, extrusion and drawing. The method has the characteristics of one-time accomplishment of reaction synthesis of a copper oxide and the sintering of the material, fresh interface formed from silver and the copper oxide, firm combination, good comprehensive performance of the material, etc.; the dispersion of oxide particles is completed along processing and deformation so that the production cost is reduced; the whole production technical process has the advantages of easy control and no pollution or less pollution, and the mass production can be formed. The product can be widely used as a contact material for medium and low-voltage apparatuses.
Description
(1) technical field: metal-base composites scientific domain
(2) background technology: the preparation method of known silver copper oxide electric contacting material has following several:
1. it is with silver powder and cupric oxide powder thorough mixing that traditional powder metallurgic method prepares silver copper oxide electric contacting material, and mixed powder prepares silver copper oxide electric contacting material through press forming, sintering, repressing and re-sintering, extruding drawing or rolling technology again;
2. prepare the silver copper oxide composite powder by chemical precipitation method, prepare silver copper oxide electric contacting material through batch mixing, press forming, sintering, repressing and re-sintering, extruding drawing or rolling technology again;
By the ultrasonic dispersing copper oxide particle, make silver be coated on the cupric oxide surface, finally obtain the silver copper oxide composite powder, prepare silver copper oxide electric contacting material through batch mixing, press forming, sintering, repressing and re-sintering, extruding drawing or rolling technology again;
4. prepare cupric oxide powder by flash set technology, make silver and cupric oxide thorough mixing, prepare silver copper oxide electric contacting material through batch mixing, press forming, sintering, repressing and re-sintering, extruding drawing or rolling technology again through mechanical alloying or other method;
5. inventor herein application and " synthesis method for preparing silver-tin dioxide " that the get the Green Light (patent No.: ZL99104491.6) and apply for invention disclosed patent " silver-colored rare earth oxide contact material technology of preparing " (application number: 02113216.X) invented a kind of method for preparing siluer metal oxide (stannic oxide, rare earth oxide) contact material by reactive synthesis technique.This technology becomes technical foundation of the present invention.
The technology of preparing of known silver copper oxide electric contacting material, target is invented at alternative deleterious Agcdo contact material equally, but in these material preparation technology or exist the pollution problem of acid in the silver copper oxide composite powder preparation process, alkali, salt, or owing to preparing cupric oxide powder separately, mixing with silver powder again, thereby make that the preparatory stage of powder is long, cause complex process, production cost too high.In addition, in the technology of preparing of known silver copper oxide electric contacting material, the disperse of cupric oxide was just finished in the powder preparatory stage, brought very big difficulty for the following process of high oxidation copper content (the cupric oxide weight percent content is greater than 15%) sintering ingot blank.Because in the technology of preparing of known silver copper oxide electric contacting material, matrix silver is mechanical bond with the combination of cupric oxide, cause silver copper oxide electric contacting material to electrically contact the life-span lower, limited the use range of such material.
(3) summary of the invention
The objective of the invention is the deficiency that exists at known technology and a kind of novel method of succeeding in developing, this method is a raw material with silver powder, copper powder or yellow gold powder, adding a spot of tungsten (W), molybdenum (Mo) element is that performance is adjusted element, oxide compound with silver is a reagent, the CONTROL PROCESS condition makes the reaction of oxide compound synthesize with the material sintering and once finishes, silver matrix is fresh with the formed interface of oxide particle, combine firmly, obtained over-all properties height, silver copper oxide electric contacting material that cost is low.
The present invention realizes by following technical scheme.
Fig. 1 is a process flow sheet of the present invention.Raw material mixes in mixer after preparing burden, and make biscuit with two-way compacting of punching block or hydrostatic pressing, then biscuit is sent into and reacted in the sintering oven and sintering, solid state reaction original position by stock yard in silver matrix generates copper oxide particle, become the sintering ingot blank, make the bonding interface of matrix and copper oxide particle fresh pollution-free, combine firmly; Ingot blank behind the sintering becomes the repressing and re-sintering base again behind repressing and re-sintering, the repressing and re-sintering base send extrusion machine directly to extrude the line bar; At last the line bar is carried out cold drawing processing, make silver copper oxide silk material.
One, material composition, granularity and shared weight percent thereof
1, base-material:
Silver powder, copper powder, or yellow gold powder; Powder size is less than 45 microns.Copper accounts for the 6-30% of gross weight, and surplus is a silver;
Yellow gold powder system obtains by melting, the water atomization flouring technology of yellow gold.
2, add element:
1. tungsten (W): be no more than 0.25% of gross weight, granularity is less than 45 microns;
2. molybdenum (Mo): be no more than 0.18% of gross weight; Granularity is less than 45 microns;
3, reactant:
Silver oxide, granularity is less than 74 microns; The 20-50% of shared gross weight
Two, composition of raw materials:
Base-material+interpolation element 1.+reactant
Or:
Base-material+interpolation element 2.+reactant
Or:
Base-material+interpolation element 1. 2.+reactant
Three, technical qualification
1. mixing time 1-30 hour;
2. biscuit compacting pressure
The two-way compacting of punching block: 400-800MPa;
Or:
Cold isostatic compaction: 100-300MPa;
3. biscuit sintering temperature 600-900 ℃, time 4-8 hour;
4. the sintering ingot blank is answered pressure pressure 300-600MPa;
5. sintering ingot blank resintering temperature is 500-900 ℃, time 6-12 hour;
6. repressing and re-sintering base extrusion temperature is 400-600 ℃.
Compare advantage and the positively effect that is had with known technology:
1. the generation of cupric oxide and material sintering are once finished, and copper oxide particle wild phase original position generates, and be fresh with the formed interface of silver matrix, combine firmly, and the over-all properties of material is greatly improved;
2. cloth is divided in the disperse of copper oxide particle, finishes by machining deformation, has solved the especially problem of high oxidation copper content material following process difficulty of silver copper oxide electric contacting material;
3. the life-span that electrically contacts of silver copper oxide electric contacting material improves, and has enlarged the use range of such material.
Raw material prepare simple, technical process is controlled easily, with short production cycle, product cost is low; And can realize producing production process environmentally safe or less contamination in enormous quantities.
(4) description of drawings: Fig. 1 is a process flow sheet of the present invention.
(5) embodiment:
Embodiment one
Copper powder (weight percent) by 8%, 69% silver powder (weight percent), 23% silver suboxide is raw material 0.1% tungsten of gross weight (and add), after mixing in 10 hours, two-way press forming becomes biscuit in punching block, and the biscuit compacting pressure is 650MPa; Biscuit is through being sintered into ingot blank in 850 ℃, 4 hours; Ingot blank is pressed again with the pressure of 500MPa, and 700 ℃, 10 hours resinterings are squeezed into the line bar then under 600 ℃ temperature condition, and last cold drawing becomes line (silk) material.
Embodiment two
Copper powder (weight percent) by 9.8%, 55.2% silver powder (weight percent), silver suboxide 35% (weight percent), and the ratio preparation raw material of the 0.08%Mo (molybdenum) of adding copper powder, silver powder and silver oxide gross weight, mixed through 16 hours, two-way press forming becomes biscuit in punching block, biscuit compacting pressure 450MPa; Biscuit was sintered into ingot blank through 800 ℃, 8 hours, and ingot blank is pressed again with 450MPa, 820 ℃, 6 hours resinterings, and 500 ℃ are squeezed into the line bar, and last cold drawing becomes line (silk) material.
Embodiment three
By yellow gold powder 57% (wherein the weight percent content of copper be the yellow gold powder 21%), silver suboxide 43%, the ratio preparation raw material of powdered alloy and silver oxide gross weight 0.05%W (tungsten), 0.02%Mo (molybdenum), mixed through 24 hours, cold isostatic compaction becomes biscuit, biscuit compacting pressure 250MPa; Biscuit was sintered into ingot blank through 740 ℃, 5 hours, and ingot blank is pressed again with 550MPa, 850 ℃, 5 hours resinterings, and 550 ℃ are squeezed into the line bar, and last cold drawing becomes line (silk) material.
Claims (4)
1. the preparation method of a silver copper oxide electric contacting material is characterized in that:
1) technical process: raw material mixes in mixer after preparing burden, and becomes biscuit through behind the cold-press moulding; Biscuit is sent into and is carried out sintering in the sintering oven and react synthetic, and the solid state reaction original position by stock yard in silver matrix generates copper oxide particle, becomes the sintering ingot blank; Ingot blank behind the sintering becomes the repressing and re-sintering base again behind repressing and re-sintering, the repressing and re-sintering base send extrusion machine to extrude the line bar, at last the line bar is carried out cold drawing processing, makes silver copper oxide silk material,
2) material composition, granularity and shared weight percent:
Base-material: silver powder, copper powder; Or yellow gold powder.
Powder size is less than 45 microns, and wherein, copper accounts for the 6-30% of gross weight, and surplus is a silver;
Add element: 1. tungsten is no more than 0.25% of gross weight, and 2. molybdenum is no more than 0.18% of gross weight;
Reactant silver oxide, granularity be less than 74 microns,
3) composition of raw materials:
Base-material+interpolation element 1.+reactant
4) technical qualification:
1. mixing time 1-30 hour;
2. biscuit compacting pressure
The two-way compacting of punching block: 400-800MPa or cold isostatic compaction: 100-300MPa;
3. biscuit sintering temperature 600-900 ℃, time 4-8 hour;
4. the sintering ingot blank is answered pressure pressure 300-600MPa;
5. sintering ingot blank resintering temperature is 500-900 ℃, time 6-12 hour;
6. repressing and re-sintering base extrusion temperature is 400-600 ℃;
2. the preparation method of a silver copper oxide electric contacting material is characterized in that: in accordance with the method for claim 1, composition of raw materials be base-material+interpolation element 1. 2.+reactant
3, method according to claim 1 prepares silver copper oxide electric contacting material, it is characterized in that: the silver powder that is 8% copper powder 69% by weight percentage, 23% silver suboxide is a raw material, and the tungsten of adding gross weight 0.1%, after mixing in 10 hours, two-way press forming becomes biscuit in punching block, and the biscuit compacting pressure is 650MPa; Biscuit is through being sintered into ingot blank in 850 ℃, 4 hours; Ingot blank is pressed again with the pressure of 500MPa, and 700 ℃, 10 hours resinterings are squeezed into the line bar then under 600 ℃ temperature condition, and last cold drawing becomes line or silk material.
4. the preparation method of silver copper oxide electric contacting material according to claim 2, it is characterized in that: be yellow gold powder 57% by weight percentage, wherein the weight percent content of copper is 21% of a yellow gold powder, silver suboxide 43%, powdered alloy adds the ratio preparation raw material of silver oxide gross weight 0.05% tungsten, 0.02% molybdenum, through mixing in 24 hours, cold isostatic compaction became biscuit, biscuit compacting pressure 250MPa; Biscuit was sintered into ingot blank through 740 ℃, 5 hours, and ingot blank is pressed again with 550MPa, 850 ℃, 5 hours resinterings, and 550 ℃ are squeezed into the line bar, and last cold drawing becomes line or silk material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 03134913 CN1224725C (en) | 2003-09-29 | 2003-09-29 | Method for preparing silver copper oxide electric contact material |
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| CN 03134913 CN1224725C (en) | 2003-09-29 | 2003-09-29 | Method for preparing silver copper oxide electric contact material |
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| CN1224725C true CN1224725C (en) | 2005-10-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935792A (en) * | 2010-09-08 | 2011-01-05 | 昆明理工大学 | Preparation method of fibriform metal copper oxide enhanced silver-based electric contact material |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354999C (en) * | 2005-10-07 | 2007-12-12 | 乐清市帕特尼触头有限公司 | Cleaning environment-friendly type copper-base contact material for low-voltage electrical apparatus and its contact preparing method |
| CN100437857C (en) * | 2006-11-24 | 2008-11-26 | 林羽锦 | Machining technique of silver/copper double composite strip material |
| CN103611755B (en) * | 2013-11-28 | 2016-02-03 | 昆明理工大学 | Complex-phase metallic oxide strengthens the preparation method of Ag-based electrical contact silk material |
| CN108103339A (en) * | 2017-12-18 | 2018-06-01 | 浙江工业大学 | A kind of preparation method of silver-based barium titanate composited contact material |
| CN111961911B (en) * | 2020-07-24 | 2022-04-26 | 浙江耐迩合金科技有限公司 | Preparation method of silver-based electric contact material with high fusion welding resistance |
| CN111979444B (en) * | 2020-08-26 | 2021-09-28 | 郑州机械研究所有限公司 | Silver solder and preparation method and application thereof |
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2003
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935792A (en) * | 2010-09-08 | 2011-01-05 | 昆明理工大学 | Preparation method of fibriform metal copper oxide enhanced silver-based electric contact material |
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