Electric contact material made of silver-tungsten carbide graphite and preparation method thereof

A technology of tungsten carbide graphite and contact materials, which is applied to contacts, electrical components, electrical switches, etc., can solve the problem of meeting the requirements of high reliability and electromagnetic compatibility, oxidation resistance, and welding resistance of the fourth-generation low-voltage electrical appliances. Poor resistance to arc burnout, limited application fields of contact materials, etc., to achieve the effects of high reliability, high electrical life, and high temperature oxidation resistance

Active Publication Date: 2012-06-06
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing silver tungsten carbide graphite contact materials have the defects of poor oxidation resistance, welding resistance and arc burning resistance, and the overall performance is not stable enough, which limits the application field of the contact material and is difficult to meet the requirements of the first High reliability and electromagnetic compatibility requirements of the fourth generation of low-voltage electrical appliances

Method used

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  • Electric contact material made of silver-tungsten carbide graphite and preparation method thereof
  • Electric contact material made of silver-tungsten carbide graphite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 , refer to figure 1 , taking the preparation of AgWC9.6ZrC2.4C3 with a specification of 7.5×7.5×2.5mm as an example.

[0023] (1) Ag powder was mixed with tungsten carbide-zirconium carbide solid solution and graphite at a ratio of 85:12:3, mixed with 0.3% Ni and 0.7% B for 6 hours, and the ball-to-material ratio was 1:1, and dried in vacuum. Agglomerate granulation at 700°C in a hydrogen atmosphere for 4 hours to obtain a mixed powder with good fluidity, wherein the ratio of tungsten carbide to zirconium carbide in the tungsten carbide-zirconium carbide solid solution is 8:2;

[0024] (2) Press the granulated mixed powder into a 7.5×7.5×3.5mm compact, with an initial pressure of 150MPa;

[0025] (3) Sinter the compact in a hydrogen atmosphere at 880°C for 4 hours;

[0026] (4) Repress the sintered body with a pressure of 250MPa, and the thickness of the green body is 2.8mm;

[0027] (5) Anneal the green body after re-pressing at 500°C for 2 hours in a hy...

Embodiment 2

[0031] Example 2 , taking the preparation of AgWC9.8ZrC4.2C2 with a specification of 6×6×2mm as an example.

[0032] (1) Mix Ag powder with tungsten carbide-zirconium carbide solid solution and graphite at a ratio of 84:14:2, wet mix with 0.4% Cr for 4 hours, the ball-to-material ratio is 3:1, dry in vacuum, and dry in a hydrogen atmosphere 750°C, 3 hours for agglomeration and granulation to obtain a mixed powder with good fluidity, wherein the ratio of tungsten carbide to zirconium carbide in the tungsten carbide-zirconium carbide solid solution is 7:3;

[0033] (2) Press the granulated mixed powder into a 6×6×2.8mm compact, and the initial pressure is 180MPa.

[0034] (3) The compact is sintered in a hydrogen atmosphere at 900°C for 3 hours;

[0035] (4) Repress the sintered body with a pressure of 280MPa, and the thickness of the green body is 2.2mm;

[0036] (5) Anneal the green body after re-pressing at 600°C for 4 hours in a hydrogen atmosphere;

[0037] (6) Repress...

Embodiment 3

[0040] Example 3 , taking the preparation of AgWC10.8ZrC1.2C3 with a specification of 11×9×2mm as an example.

[0041] (1) Ag powder was mixed with tungsten carbide-zirconium carbide solid solution and graphite at a ratio of 85:12:3, mixed with 0.3% Ni and 0.7% B for 6 hours, and the ball-to-material ratio was 1:1, and dried in vacuum. Agglomerate granulation at 700°C in a hydrogen atmosphere for 4 hours to obtain a mixed powder with good fluidity, wherein the ratio of tungsten carbide to zirconium carbide in the tungsten carbide-zirconium carbide solid solution is 9:1;

[0042] (2) Press the granulated mixed powder into a 11×9×2.8mm compact, with an initial pressure of 150MPa;

[0043] (3) The compact is sintered in a hydrogen atmosphere at 880°C for 4 hours;

[0044] (4) Repress the sintered body with a pressure of 250MPa, and the thickness of the green body is 2.2mm;

[0045] (5) Anneal the repressed green body at 500°C for 2 hours in a hydrogen atmosphere;

[0046] (6...

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Abstract

The invention relates to an electric contact material made of silver-tungsten carbide graphite and a preparation method thereof. The electric contact material comprises the following main components in percentage by weight: 11%-14% of tungsten carbide-zirconium carbide solid solution, 2%-6% of graphite, 0.3%-0.6% of additive and the balance of silver, wherein the added element is one or the combination of Ti, Co and Cr. The tungsten carbide and the zirconium carbide are added in form of solid solution with the ratio of (6:4)-(9:1). Compared with the traditional electric contact made of silver-tungsten carbide graphite, the electric contact material has higher welding resistance, electric arc burning resistance and high-temperature oxidation resistance. A low-voltage electric appliance adopting the electric contact material has lower contact resistance, longer electric service life and high reliability. Therefore, the novel electric contact material with high reliability is more suitable for being applied in various different plastic-shell circuit breakers, small high-interruption circuit breakers and alternating-current contactors.

Description

technical field [0001] The invention belongs to electric contact materials, and specifically refers to a silver tungsten carbide graphite electric contact material with high temperature oxidation resistance, welding resistance and high arc burning resistance and a preparation method thereof. Background technique [0002] Electric contacts are the core components of low-voltage electrical appliances. They undertake the task of connecting and disconnecting circuits in various control switches, and are widely used in military, aerospace, and industrial control fields. The electrical properties of silver-based contact materials have a crucial impact on the long life and high reliability of various electrical control systems. [0003] Silver-tungsten carbide-carbon electrical contact material, as a new generation of contact material to replace the traditional AgC5, has excellent welding resistance and is widely used in automatic switches, large-capacity circuit breakers, molded c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/06C22C1/05H01H1/0233
Inventor 张秀芳柏小平宋珂翁桅
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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