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Preparation method of cadmium molybdate modified copper-based composite electric contact material

An electrical contact material, copper-based composite technology, used in contacts, circuits, electrical switches, etc., can solve problems such as shortage of Ag resources, Cd vapor pollution, etc., to improve microstructure properties and service performance, high interface bonding strength, The effect of improving the degree of uniform dispersion

Active Publication Date: 2020-02-14
宁波坤铜合金材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent not only solves the problem of pollution of Cd vapor in the CdO / Ag contact material and the problem of shortage of Ag resources through the method of in-situ synthesis, but also realizes the realization of CdMoO 4 The purpose of uniform dispersion distribution; through hot extrusion-rolling-stamping and other links, taking advantage of the good plasticity of copper alloys, the CdMoO 4 Efficient densification of / Cu composites and further enhanced CdMoO 4 The degree of uniform dispersion in the copper matrix improves the microstructure and service performance of electrical contacts

Method used

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  • Preparation method of cadmium molybdate modified copper-based composite electric contact material

Examples

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Effect test

Embodiment 1

[0016] Example 1 A preparation method of cadmium molybdate modified copper-based composite electrical contact material

[0017] Include the following steps

[0018] (1) Take the amount of Na in the formula 2 MoO 4 1.5g was dissolved in 100mL water to obtain a mixed solution, and the copper alloy powder (48g) was added with a formula dosage of 50% and stirred to form a suspension, and then 50mL CdCl 2 Add the aqueous solution into the suspension and continue to stir, and obtain a composite powder after filtering, washing, and drying; the CdCl 2 CdCl in aqueous solution 2 The mass fraction is 2.6%.

[0019] (2) After mixing the obtained composite powder with the remaining copper alloy powder (48g) in the formula, press molding at 400Mpa, sinter at 965°C for 0.5h, and heat-extrude the sintered composite material into a 50x6mm Plate, and then through rolling (pressed blanking amount is 0.2mm), annealing treatment (450 ℃, heat preservation 0.5h)), after stamping, obtain a φ5 ...

Embodiment 2

[0022] Example 2 A preparation method of cadmium molybdate modified copper-based composite electrical contact material

[0023] Include the following steps

[0024] (1) Take the amount of Na in the formula 2 MoO 4 3.7g was dissolved in 100mL water to obtain a mixed solution, and the copper alloy powder (38g) with a formula consumption of 40% was added and stirred to form a suspension, and then 50mL CdCl 2 Add the aqueous solution into the suspension and continue to stir, and obtain a composite powder after filtering, washing, and drying; the CdCl 2 CdCl in aqueous solution 2 The mass fraction is 6.5%.

[0025] (2) After mixing the obtained composite powder with the remaining copper alloy powder (57g) in the formula, press molding at 350Mpa, sinter at 950°C for 0.2h, and heat-extrude the sintered composite material into a 50x6mm Plate, and then through rolling (pressed blanking amount is 0.2mm), annealing treatment (440 ℃, heat preservation 0.5h)), after stamping, obtain ...

Embodiment 3

[0028] Example 3 A preparation method of cadmium molybdate modified copper-based composite electrical contact material

[0029] Include the following steps

[0030] (1) Take the amount of Na in the formula 2 MoO 4 6g is dissolved in 100mL water to obtain a mixed solution, add copper alloy powder (55g) with a formula consumption of 60% and stir to form a suspension, and then 50mL CdCl 2 Add the aqueous solution into the suspension and continue to stir, and obtain a composite powder after filtering, washing, and drying; the CdCl 2 CdCl in aqueous solution 2 The mass fraction is 10.4%.

[0031] (2) After mixing the obtained composite powder with the remaining copper alloy powder (37g) in the formula, press molding at 450Mpa, sinter at 970°C for 0.8h, and heat-extrude the sintered composite material into a 50x6mm Plate, and then after rolling (pressed blanking amount is 0.2mm), annealing treatment (460 ° C, heat preservation 1h)), after stamping, obtain a φ5 × 2mm contact el...

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Abstract

The invention discloses a preparation method of a cadmium molybdate modified copper-based composite electric contact material. According to the method, uniform nucleation and growth of CdMoO4 are completed on the surface of copper powder particles through an in-situ synthesis method, so that cadmium molybdate modified copper-based (CdMoO4 / Cu) composite electrical contact material with second-phaseuniform dispersion distribution is prepared. According to the method, the problems of pollution problem of Cd vapor in a CdO / Ag contact material and Ag resource shortage are solved, and the purpose of uniform dispersion distribution of the CdMoO4 is achieved; and through the steps of hot extrusion, rolling, stamping and the like, the characteristics of good plasticity of copper alloy are used, sothat the efficient densification of CdMoO4 / Cu composite material is realized, the uniform dispersion degree of the CdMoO4 in a copper matrix is further improved, and thereby the microstructure performance and the service performance of an electrical contact are improved.

Description

technical field [0001] The invention relates to the technical field of electrical contact materials, in particular to a method for preparing a cadmium molybdate-modified copper-based composite electrical contact material. Background technique [0002] Electrical contact elements for low-voltage circuit breakers usually use copper-based electrical contact materials prepared by powder metallurgy sintering. Electrical contact elements serve in complex load environments such as mechanical impact wear and local arc ablation, so high requirements are placed on the mechanical wear resistance and arc ablation resistance of electrical contact elements. [0003] CdO / Ag contact material has a very wide range of applications due to its good arc ablation resistance, welding resistance and low and stable contact resistance, and was once called "universal contact". However, the CdO / Ag contact material will produce toxic Cd vapor due to the pyrolysis of CdO during the arc extinguishing pro...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C9/00C22C32/00B22F1/00H01H1/025
CPCB22F1/0003B22F2998/10C22C1/05C22C9/00C22C32/001H01H1/025B22F3/02B22F3/10B22F2003/208B22F3/18B22F2003/248
Inventor 谷文伟
Owner 宁波坤铜合金材料有限公司
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