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Silver tungsten carbide-molybdenum composite electrical contact material as well as skeleton powder and preparation method thereof

A technology of electrical contact materials, silver tungsten carbide, applied in circuits, electrical switches, electrical components, etc., can solve problems such as complex process, affecting material infiltration and end-use performance, so as to improve physical properties and improve adverse effects , the effect of increasing strength

Inactive Publication Date: 2020-04-14
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Patent CN108264048A discloses a method for removing free carbon in transition metal carbides, which mainly uses Ca-CaCl 2 Removal of free carbon and removal of CaC with acid leaching 2 , the process of this method is more complicated, and the introduction of Ca, CaCl 2 Materials such as acids and acids may have material residues that affect material infiltration and end-use performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Premixed powder: Weigh 4.9 kg of tungsten carbide powder with an average particle size of 0.4 microns and 0.15 kg of molybdenum trioxide powder with an average particle size of 40 nm, and ball mill for 20 hours.

[0030] (2) Removal of free carbon: In an inert atmosphere, sinter the tungsten carbide-molybdenum trioxide mixed powder at 500°C for 3 hours, so that the free carbon in the tungsten carbide powder and the molybdenum trioxide powder can fully react to remove free carbon and make Molybdenum trioxide is partially converted to molybdenum dioxide.

[0031] (3) Mixed silver powder: Weigh 5 kg of silver powder and mix it with the treated tungsten carbide powder in a powder mixer for 10 hours.

[0032] (4) Sintering granulation and reduction of oxides: In a reducing atmosphere, the mixed powder is sintered by step sintering. The first step is to sinter the mixed powder at 500 ° C for 3 hours, and the second step is to sinter the mixed powder at 900 ° C. ℃ sinteri...

Embodiment 2

[0035] (1) Premixed powder: Weigh 7.75 kg of tungsten carbide powder with an average particle size of 0.5 micron and 0.375 kg of molybdenum trioxide powder with an average particle size of 60 nm, and ball mill for 15 hours.

[0036] (2) Removal of free carbon: In an inert atmosphere, sinter the tungsten carbide-molybdenum trioxide mixed powder at 650°C for 3.5 hours, so that the free carbon in the tungsten carbide powder and the molybdenum trioxide powder can fully react to remove free carbon and make Molybdenum trioxide is partially converted to molybdenum dioxide.

[0037] (3) Silver powder mixing: Weigh 2 kg of silver powder and mix it with the treated tungsten carbide powder in a powder mixer for 6 hours.

[0038] (4) Sintering granulation and reduction of oxides: In a reducing atmosphere, the mixed powder is sintered by step sintering. The first step is to sinter the mixed powder at 600 ° C for 4 hours, and the second step is to sinter the mixed powder at 1000 ℃ sinterin...

Embodiment 3

[0041] (1) Premixed powder: Weigh 6.3 kg of tungsten carbide powder with an average particle size of 0.7 microns and 0.3 kg of molybdenum trioxide powder with an average particle size of 80 nm, and ball mill for 20 hours.

[0042] (2) Removal of free carbon: In an inert atmosphere, sinter the tungsten carbide-molybdenum trioxide mixed powder at 550°C for 2.5 hours, so that the free carbon in the tungsten carbide powder and the molybdenum trioxide powder can fully react to remove free carbon and make Molybdenum trioxide is partially converted to molybdenum dioxide.

[0043] (3) Silver powder mixing: Weigh 3.5kg of silver powder and mix it with the processed tungsten carbide powder in the powder mixer for 8 hours.

[0044] (4) Sintering granulation and reduction of oxides: In a reducing atmosphere, the mixed powder is sintered by step sintering. The first step is to sinter the mixed powder at 550°C for 3 hours, and the second step is to sinter the mixed powder at 950°C. ℃ sinte...

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Abstract

The invention discloses a silver tungsten carbide-molybdenum composite electrical contact material as well as skeleton powder and a preparation method thereof. According to the technical scheme, the preparation method comprises the steps of ball-milling and mixing ultrafine tungsten carbide powder and nano molybdenum trioxide powder; enabling molybdenum trioxide to react with free carbon in tungsten carbide in a high-temperature inert atmosphere to form molybdenum dioxide, discharging carbon dioxide, mixing tungsten carbide, molybdenum trioxide and molybdenum dioxide mixed powder with a certain amount of pure silver powder, and sintering the mixture in a high-temperature reducing atmosphere to convert molybdenum dioxide and molybdenum trioxide powder into molybdenum powder; and then obtaining the compact ultrafine silver tungsten carbide-molybdenum composite material by adopting conventional pressing, sintering and infiltration processes. Compared with traditional silver tungsten carbide, the ultrafine silver tungsten carbide-molybdenum composite electrical contact material eliminates negative effects caused by free carbon, is higher in product compactness and strength, has very good wear resistance and burning loss resistance, and has a longer electrical life when used in a low-voltage electrical appliance.

Description

technical field [0001] The invention belongs to the field of electric contact material manufacturing technology, and specifically refers to a silver tungsten carbide-molybdenum composite electric contact material and a preparation method thereof. Background technique [0002] The electrical contact material is the core part of the electrical switch, which is responsible for the task of connecting and breaking the circuit and load current, so its performance determines the performance and operation reliability of low-voltage electrical appliances. Silver tungsten carbide material has begun to replace some silver tungsten materials for low-voltage molded case circuit breakers, In electrical products such as universal circuit breakers, leakage protection switches, and dual power transfer switches. It is generally used as a moving contact material in conjunction with silver graphite, silver tungsten carbide graphite, etc., and can also be paired statically and dynamically. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10B22F9/22B22F1/00H01H11/04
CPCB22F1/0003B22F3/1017B22F9/22H01H11/048
Inventor 林旭彤费家祥孔欣赵罗东宋林云温正勇宋振阳兰岚郭仁杰王达武陈松杨
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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