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

A tungsten carbide graphite, contact material technology, applied in the direction of contacts, electrical components, electrical switches, etc., can solve the problem of difficult to meet the high reliability and electromagnetic compatibility requirements of the fourth-generation low-voltage electrical appliances, anti-oxidation, anti-welding Problems such as poor resistance to arc burning and limiting the application field of contact materials to achieve the effects of high reliability, high electrical life, and high temperature oxidation resistance

Active Publication Date: 2011-05-11
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 Take the preparation of AgWC9.6ZrC2.4C3 with a size of 7.5×7.5×2.5mm as an example.

[0023] (1) The Ag powder, tungsten carbide-zirconium carbide solid solution and graphite are wet mixed with 0.3% Ni and 0.7% B in a ratio of 85:12:3 for 6 hours, with a ball-to-battery ratio of 1:1, and vacuum drying. Agglomerate and granulate in a hydrogen atmosphere at 700°C for 4 hours to obtain a mixed powder with good fluidity, in which 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) The compact is sintered in a hydrogen atmosphere at 880°C for 4 hours;

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

[0027] (5) Anneal the body after re-pressing in a hydrogen atmosphere at 500°C for 2 hours;

[0028] (6) R...

Embodiment 2

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

[0032] (1) The Ag powder, tungsten carbide-zirconium carbide solid solution and graphite were wet mixed with 0.4% Cr in a ratio of 84:14:2 for 4 hours, with a ball-to-material ratio of 3:1, dried in a vacuum, and in a hydrogen atmosphere Perform agglomeration granulation at 750°C for 3 hours to obtain a mixed powder with good fluidity, in which 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 with an initial pressure of 180MPa.

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

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

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

[0037] (6) Recompress the anne...

Embodiment 3

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

[0041] (1) The Ag powder, tungsten carbide-zirconium carbide solid solution and graphite are wet mixed with 0.3% Ni and 0.7% B in a ratio of 85:12:3 for 6 hours, with a ball-to-battery ratio of 1:1, and vacuum drying. Agglomerate and granulate in a hydrogen atmosphere at 700°C for 4 hours to obtain a mixed powder with good fluidity, in which 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) Sinter the compact in a hydrogen atmosphere at 880°C for 4 hours;

[0044] (4) Re-press the sintered body at a pressure of 250 MPa, and the thickness of the green body is 2.2 mm;

[0045] (5) Anneal the body after re-pressing in a hydrogen atmosphere at 500°C for 2 hours;

[0046] (6) Recompress the annealed body at a...

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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 Applications(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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