CN101979694A - Voltage-withstanding silver tungsten carbide graphite contact material and preparation method thereof - Google Patents
Voltage-withstanding silver tungsten carbide graphite contact material and preparation method thereof Download PDFInfo
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- CN101979694A CN101979694A CN 201010558958 CN201010558958A CN101979694A CN 101979694 A CN101979694 A CN 101979694A CN 201010558958 CN201010558958 CN 201010558958 CN 201010558958 A CN201010558958 A CN 201010558958A CN 101979694 A CN101979694 A CN 101979694A
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Abstract
The invention relates to a voltage-withstanding silver tungsten carbide graphite electrical contact material and a preparation method thereof. The electrical contact material comprises the following main components: 11 to 14 percent of tungsten carbide-enhanced phase solid solution, 2 to 6 percent of graphite, 0.3 to 0.6 percent of additive and the balance of silver, wherein the enhanced phase is combination of the carbides including TaC and Cr2C3; and the additive element is one or the combination of more of the following elements: Ni, Co, Cr and B. The tungsten carbide and the enhanced phase are added in the form of tungsten carbide-tantalum carbide-chromium carbide solid solution, wherein the ratio of the tungsten carbide to the tantalum carbide to the chromium carbide is (16:4:1) to (25:2:1). The silver tungsten carbide graphite contact material has higher voltage withstanding strength, fusion welding resistance and arc burning resistance. A low-voltage apparatus using the electrical contact material has longer electrical life and high reliability. Thus, the electrical contact material is more suitable for various different molded case circuit breakers, small-sized high-section breakers and alternating current contactors.
Description
Technical field
The invention belongs to electrical contact material, specifically be meant a kind of silver-colored wolfram varbide graphite electrical contact material and preparation method thereof with high proof voltage intensity and anti-electric-arc scaling loss performance.
Background technology
The AgC that the silver-tungsten carbide-carbon series electric contact materials is traditional as an alternative
5Contact material of new generation, has excellent resistance fusion welding, be widely used for auto-switch, on large capcity breaker, breaker of plastic casing and the some other derailing switch, the Ag-WC-C series electric contact has mainly utilized good conductive, the thermal conductivity of Ag, and the characteristics that the high-melting-point of WC, high rigidity and wear resistance are good can stand the intensive arc erosion, have good resistance fusion welding and erosion resistant, reached the effect of joint silver simultaneously.At present, adopt the asymmetric reasonable counterpart contact of AgWC12C3 and AgW50 pairing Chang Zuowei isolating switch in the silver-tungsten carbide-carbon series electric contact materials.
In recent years, along with the low voltage electrical apparatus industry development, constantly release the novel breaker of various series, these novel isolating switchs require contact material to have littler volume, higher breaking capacity.Therefore improve the anti-electric-arc scaling loss and the anti-material transfer performance of silver-colored wolfram varbide graphite electrical contact material, comply with the growth requirement of isolating switch, have important scientific research and be worth.Recently, more for the anti-electric-arc scaling loss performance study that improves contact material both at home and abroad, mainly adopt the refinement particle to reduce the scaling loss of electric arc to contact material.Therefore, design a kind of silver-colored wolfram varbide graphite electrical contact material and weave construction of science, to enlarge the use range of silver-colored wolfram varbide graphite contact material, it is very necessary to the performance requriements of contact material increasingly stringent to satisfy isolating switch.
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 high proof voltage silver wolfram varbide graphite contact material of high proof voltage intensity, resistance fusion welding and anti-electrical arc erosion that has is provided.
Another object of the present invention has provided a kind of proof voltage silver wolfram varbide graphite contact preparation methods.
For realizing first purpose of the present invention, technical scheme of the present invention is
Wolfram varbide and wild phase 11%-14%, graphite 2%-6% adds element 0.3% ~ 0.6%, and surplus is a silver; Wherein, described wild phase is the combination of following carbide: TaC, Cr
2C
3Described interpolation element is the one or more combination in the following element: Ni, Co, Cr, B.
Described wolfram varbide and wild phase add with wolfram varbide-tantalum carbide-chromium carbide sosoloid form, and wherein wolfram varbide is (16: 4: 1) ~ (25: 2: 1) with the ratio of tantalum carbide, chromium carbide.
For realizing another object of the present invention, technical scheme of the present invention is may further comprise the steps
(1) with wolfram varbide-wild phase sosoloid and graphite, add element, silver powder mixes in proportion, mix the powder mode for do mix or wet mixing in a kind of.Mixing the powder time is: 4 ~ 7 hours, ratio of grinding media to material was: (1: 1) ~ (5: 1);
(2) powder mix is granulated in protective atmosphere; The granulation of this step is 650 ~ 850 ℃ for carry out pelleting temperature in high temperature sintering furnace, 0.5 ~ 5 hour time, carries out in the protective atmosphere;
(3) powder mix that will granulate carries out first pressing and obtains pressed compact; The first pressing pressing pressure of this step is 50MPa ~ 200Mpa;
(4) pressed compact is carried out sintering in protective atmosphere, the sintering temperature of this step pressed compact is 850 ~ 920 ℃, and the time is 3 ~ 5 hours, the hydrogen atmosphere protection;
(5) base substrate behind the sintering being carried out once multiple the pressure handles; This step sintered body once again pressure pressure be 100 ~ 300MPa;
(6) will answer the pressed compact body anneals; This step annealing temperature is 550 ~ 650 ℃, and the time is 2 ~ 4 hours;
(7) base substrate of will annealing carries out secondary and presses again and obtain the finished product; The multiple pressure pressure of this step secondary is 500 ~ 700MPa.
The present invention has adopted wolfram varbide-tantalum carbide-chromium carbide sosoloid in the silver-colored wolfram varbide graphite contact materials process of preparation.Tantalum carbide and chromium carbide can obviously reduce tungsten carbide crystal grain degree and adjacent degree, improve high base strength.Simultaneously, TaC can improve mutually and add element Ni, Co, Cr, the B wettability to the carbide phase, strengthens substrate combinating strength.This novel silver-colored wolfram varbide graphite contact material has higher proof voltage intensity, resistance fusion welding and anti-electrical arc erosion.Adopt the low-voltage apparatus of this electrical contact material to have higher electric life and high reliability.Therefore this electrical contact material is more suitable for being applied on various mold cased circuit breaker, small-sized high score isolating switch and the alternating current contactor.
Below in conjunction with specification drawings and specific embodiments the present invention is done further introduction.
Description of drawings
Fig. 1 process flow sheet of the present invention.
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 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:
Embodiment 1,, be the AgWC9.6TaC2.4Cr of 12 * 10 * 2mm with the preparation specification with reference to Fig. 1
2C
30.6C3 be example.
(1) with Ag powder and wolfram varbide-wild phase sosoloid, graphite ratio in 84.4:12.6:3, carried out wet mixing 6 hours with 0.3%Ni, 0.7%B, ratio of grinding media to material is 1: 1, vacuum drying, in hydrogen atmosphere 700 ℃, carried out a change granulation in 4 hours, obtain the mixed powder of good fluidity, wherein the ratio of wolfram varbide and tantalum carbide, chromium carbide is 16: 4: 1 in wolfram varbide-wild phase sosoloid;
(2) mixed powder that will granulate is pressed into 12 * 10 * 2.8mm pressed compact, and first pressure pressure is 150MPa;
(3) with pressed compact in hydrogen atmosphere in 880 ℃, carried out sintering in 4 hours;
(4) pressure with base substrate 250MPa behind the sintering carries out multiple pressure, and pressed compact thickness is 2.2mm;
(5) will press again the back base substrate in hydrogen atmosphere in 500 ℃, annealed in 2 hours;
(6) will be the annealed base substrate carry out multiple pressure with the pressure of 560MPa and obtain 12 * 10 * 2mm product;
(7) silver-colored wolfram varbide carbonization zircon China ink contact is handled through grinding, polish, drying.
The AgWC9.6TaC2.4Cr of this examples preparation
2C
30.6C3 the contact physicals is as follows: density 9.16g/cm
3, resistivity 2.97 μ Ω .cm, hardness 681MPa.
Embodiment 2, be the AgWC10TaC1.5Cr of 5 * 5 * 1.5mm with the preparation specification
2C
30.5C3 be example.
(1) with Ag powder and wolfram varbide-wild phase sosoloid, graphite ratio in 85: 12: 3, carried out wet mixing 4 hours with 0.4%Co, ratio of grinding media to material is 3: 1, vacuum drying, in hydrogen atmosphere 750 ℃, carried out a change granulation in 3 hours, obtain the mixed powder of good fluidity, wherein the ratio of wolfram varbide and tantalum carbide, chromium carbide is 20: 3: 1 in wolfram varbide-wild phase sosoloid;
(2) mixed powder that will granulate is pressed into 5 * 5 * 2.1mm pressed compact, and first pressure pressure is 180MPa.
(3) with pressed compact in hydrogen atmosphere in 900 ℃, carried out sintering in 3 hours;
(4) pressure with base substrate 280MPa behind the sintering carries out multiple pressure, and pressed compact thickness is 1.7 mm;
(5) will press again the back base substrate in hydrogen atmosphere in 600 ℃, annealed in 4 hours;
(6) will be the annealed base substrate carry out multiple pressure with the pressure of 600MPa and obtain 5 * 5 * 1.5mm;
(7) silver-colored wolfram varbide carbonization zircon China ink contact is handled through grinding, polish, drying.
The AgWC10TaC1.5Cr of this examples preparation
2C
30.5C3 the contact physicals is as follows: density 9.21g/cm
3, resistivity 3.02 μ Ω .cm, hardness 693MPa.
Embodiment 3, be the AgWC9TaC1.8Cr of 8 * 6 * 1.8mm with the preparation specification
2C
30.45C3 be example.
(1) with Ag powder and wolfram varbide-wild phase sosoloid, graphite ratio in 85.75: 11.25: 3, carried out wet mixing 6 hours with 0.4%Ni, 0.5%B, ratio of grinding media to material is 1: 1, vacuum drying, in hydrogen atmosphere 700 ℃, carried out a change granulation in 4 hours, obtain the mixed powder of good fluidity, wherein the ratio of wolfram varbide and tantalum carbide, chromium carbide is 20: 4: 1 in wolfram varbide-wild phase sosoloid;
(2) mixed powder that will granulate is pressed into 8 * 6 * 2.52mm pressed compact, and first pressure pressure is 150MPa;
(3) with pressed compact in hydrogen atmosphere in 880 ℃, carried out sintering in 4 hours;
(4) pressure with base substrate 250MPa behind the sintering carries out multiple pressure, and pressed compact thickness is 2mm;
(5) will press again the back base substrate in hydrogen atmosphere in 500 ℃, annealed in 2 hours;
(6) will be the annealed base substrate carry out multiple pressure with the pressure of 560MPa and obtain 8 * 6 * 1.8mm product;
(7) silver-colored wolfram varbide carbonization zircon China ink contact is handled through grinding, polish, drying.
The AgWC9TaC1.8Cr of this examples preparation
2C
30.45C3 the contact physicals is as follows: density 9.07g/cm
3, resistivity 2.85 μ Ω .cm, hardness 668MPa.
Embodiment 4, be the AgWC10TaC0.8Cr of 10 * 5.5 * 2mm with the preparation specification
2C
30.4C3 be example.
(1) with Ag powder and wolfram varbide-zirconium carbide sosoloid, graphite ratio in 85.8: 11.2: 3, carried out wet mixing 4 hours with 0.4%Cr, ratio of grinding media to material is 3: 1, vacuum drying, in hydrogen atmosphere 720 ℃, carried out a change granulation in 4 hours, obtain the mixed powder of good fluidity, wherein the ratio of wolfram varbide and zirconium carbide is 6: 4 in wolfram varbide-zirconium carbide sosoloid;
(2) mixed powder that will granulate is pressed into 10 * 5.5 * 2.8mm pressed compact, and first pressure pressure is 180Mpa;
(3) with pressed compact in hydrogen atmosphere in 900 ℃, carried out sintering in 3 hours;
(4) pressure with base substrate 280MPa behind the sintering carries out multiple pressure, and pressed compact thickness is 2.2mm;
(5) will press again the back base substrate in hydrogen atmosphere in 600 ℃, annealed in 4 hours;
(6) will be the annealed base substrate carry out multiple pressure with the pressure of 600MPa and obtain 10 * 5.5 * 2mm;
(7) silver-colored wolfram varbide carbonization zircon China ink contact is handled through grinding, polish, drying.
The AgWC10TaC0.8Cr of this examples preparation
2C
30.4C3 the contact physicals is as follows: density 9.18g/cm
3, resistivity 2.88 μ Ω .cm, hardness 673MPa.
Claims (9)
1. proof voltage silver wolfram varbide graphite contact material is characterized in that comprising following component, in massfraction:
Wolfram varbide-wild phase 11%-14%, graphite 2%-6% adds element 0.3% ~ 0.6%, and surplus is a silver; Wherein, described wild phase is the combination of following carbide: TaC, Cr
2C
3Described interpolation element is the one or more combination in the following element: Ni, Co, Cr, B.
2. a kind of proof voltage silver wolfram varbide graphite contact material according to claim 1, it is characterized in that: described wolfram varbide-wild phase adds with wolfram varbide-tantalum carbide-chromium carbide sosoloid form, and wherein wolfram varbide is (16: 4: 1) ~ (25: 2: 1) with the ratio of tantalum carbide, chromium carbide.
3. one kind prepares proof voltage silver wolfram varbide graphite contact preparation methods as claimed in claim 1, it is characterized in that may further comprise the steps:
(1) with wolfram varbide-tantalum carbide-chromium carbide sosoloid and graphite, add element, silver powder mixes powder in proportion, mixes the powder mode for doing a kind of in mixed or the wet mixing;
(2) powder mix is granulated in protective atmosphere;
(3) powder mix that will granulate carries out first pressing and obtains pressed compact;
(4) pressed compact is carried out sintering in protective atmosphere;
(5) base substrate behind the sintering being carried out once multiple the pressure handles;
(6) will answer the pressed compact body anneals in protective atmosphere;
(7) base substrate of will annealing carries out secondary and presses again and obtain the finished product.
4. a kind of proof voltage silver wolfram varbide graphite contact preparation methods according to claim 3, protective atmosphere is hydrogen or rare gas element.
5. a kind of silver-colored wolfram varbide graphite contact preparation methods according to claim 3 is characterized in that: mixing the powder time in the described step (1) is: 4 ~ 7 hours, ratio of grinding media to material was: (1: 1) ~ (5: 1).
6. a kind of silver-colored wolfram varbide graphite contact preparation methods according to claim 3 is characterized in that: the granulation of described step (2) is 650 ~ 850 ℃ for carry out pelleting temperature in high temperature sintering furnace, 0.5 ~ 5 hour time.
7. a kind of silver-colored wolfram varbide graphite contact preparation methods according to claim 3, it is characterized in that: the first pressing pressing pressure of described step (3) is 50MPa ~ 200MPa.
8. a kind of silver-colored wolfram varbide graphite contact preparation methods according to claim 3, it is characterized in that: the sintering temperature of described step (4) pressed compact is 850 ~ 920 ℃, and the time is 3 ~ 5 hours.
9. a kind of silver-colored wolfram varbide graphite contact preparation methods according to claim 3 is characterized in that: described step (5) sintered body once again pressure pressure be 100 ~ 300MPa; Described step (6) annealing temperature is 550 ~ 650 ℃, and the time is 2 ~ 4 hours; The multiple pressure pressure of described step (7) secondary is 500 ~ 700MPa.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522229A (en) * | 2011-12-30 | 2012-06-27 | 浙江天银合金技术有限公司 | Production process of silver-tungsten carbide and silver-nickel-copper compounded electric contact |
| CN102899551A (en) * | 2012-11-07 | 2013-01-30 | 福达合金材料股份有限公司 | Silver-saving silver tungsten carbide graphite electrical contact material for high-performance low-voltage circuit breaker |
| CN104051054A (en) * | 2014-06-20 | 2014-09-17 | 哈尔滨东大高新材料股份有限公司 | Silver-based and titanium-carbide-based contact material and preparation method thereof |
| WO2015074349A1 (en) * | 2013-11-22 | 2015-05-28 | 福达合金材料股份有限公司 | Method for preparing silver metallic oxide graphite composite electrical contact material and product thereof |
| CN105977065A (en) * | 2016-06-20 | 2016-09-28 | 仙居县南大合金科技有限公司 | Chromium carbide copper-based contact material for low-voltage electric appliance, and processing method for chromium carbide copper-based contact material |
| CN112126810A (en) * | 2020-09-03 | 2020-12-25 | 大都克电接触科技（中国）有限公司 | Preparation method of silver tungsten carbide graphite electrical contact material |
| CN114182126A (en) * | 2021-12-01 | 2022-03-15 | 苏州市希尔孚新材料股份有限公司 | Preparation method of high-performance silver tungsten carbide graphite contact material |
| CN115522093A (en) * | 2022-08-24 | 2022-12-27 | 苏州银孚新材料有限公司 | Composite reinforced silver tungsten carbide graphite electric shock material and preparation method thereof |
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| CN105977065A (en) * | 2016-06-20 | 2016-09-28 | 仙居县南大合金科技有限公司 | Chromium carbide copper-based contact material for low-voltage electric appliance, and processing method for chromium carbide copper-based contact material |
| CN112126810A (en) * | 2020-09-03 | 2020-12-25 | 大都克电接触科技（中国）有限公司 | Preparation method of silver tungsten carbide graphite electrical contact material |
| CN114182126A (en) * | 2021-12-01 | 2022-03-15 | 苏州市希尔孚新材料股份有限公司 | Preparation method of high-performance silver tungsten carbide graphite contact material |
| CN115522093A (en) * | 2022-08-24 | 2022-12-27 | 苏州银孚新材料有限公司 | Composite reinforced silver tungsten carbide graphite electric shock material and preparation method thereof |
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Application publication date: 20110223 |