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Method for preparing Ag/SnO2 composite material

A composite material and ph value technology, which is applied in the direction of contacts, electrical components, circuits, etc., can solve problems such as surface temperature rise, electrical contact material contact resistance increase, electrical performance degradation, etc., to overcome performance degradation and eliminate contact The effect of increased resistance

Inactive Publication Date: 2012-01-18
ZHEJIANG UNIV
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Problems solved by technology

However, due to the SnO 2 Density (6.38g / cm 3 ) than the density of the matrix Ag (10.53g / cm 3 ) small, in Ag / SnO 2 After the composite material formed a micro-melt pool due to arc erosion, the SnO 2 It will float and enrich on the surface of the material to form SnO which is not easy to conduct electricity 2 Slag, resulting in increased contact resistance of electrical contact materials, excessive surface temperature rise, and electrical performance degradation

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  • Method for preparing Ag/SnO2 composite material

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Embodiment Construction

[0019] The present invention is further described by examples below.

[0020] Ag / SnO provided by the invention 2 The preparation method of composite material specifically comprises the following steps:

[0021] (1) Mix ammonia water and SnCl with a pH value of 1 to 3 under stirring conditions 4 ·5H 2 The acidic aqueous solution of O is added dropwise to the WC suspension aqueous solution with a mass fraction of 5% at the same time, so that the pH value of the reaction system is 2 to 4, and the molar ratio of Sn to W is 1:10 to 1:4; at 50 to 90 ° C After reacting for 1-12 hours under the same conditions, the suspension was filtered, washed, vacuum-dried and then calcined to obtain a composite SnO with a core-shell coating structure. 2 particles;

[0022] (2) The above composite SnO 2 Particles and silver powder are ball milled evenly to compound SnO 2 The particles account for 8% to 20% of the total mass of the mixed powder to obtain a mixed powder;

[0023] (3) The unif...

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Abstract

The invention relates to preparation of silver-based composite materials, and aims to provide a method for preparing an Ag / SnO2 composite material. The method comprises the following steps of: simultaneously dripping ammonia water and an acid aqueous solution of SnCl4.5H2O into a WC suspended aqueous solution with stirring, reacting, filtering and washing, performing vacuum drying, and calcining to obtain core-shell coated structure composite SnO2 particles; performing ball milling on the particles and silver powder and uniformly mixing to obtain mixed powder; performing isostatic pressing onthe mixed powder to obtain a blank; and sintering, re-pressing and re-sintering in turn; and performing hot extrusion forming to obtain the Ag / SnO2 composite material. By the Ag / SnO2 composite material prepared by the method, composite particles are ensured to have good characteristics similar to those of SnO2, and a defect of performance degradation caused by component segregation in the using process of the traditional electric contact material can be effectively overcome by regulating a compounding ratio of SnO2 to WC, so that adverse effects of contact resistance increase and temperature rise on electrical usability after long-term use are eliminated.

Description

technical field [0001] The present invention relates to a kind of preparation method of silver-based composite material, specifically, a kind of Ag / SnO 2 Methods of preparation of composite materials. Background technique [0002] Electrical contact materials and components are the core foundation of the electrical industry, responsible for the task of connecting and breaking currents, and their performance directly affects the switching capacity, service life and operational reliability of the complete equipment. Ag / CdO electrical contact composite materials have been widely used since the 1950s. They have the advantages of arc resistance, welding resistance, electrical and mechanical wear resistance, corrosion resistance, low contact resistance, and good processability. In the range of voltage or current, it shows excellent electrical contact performance, and is called "universal contact material". In the following decades, Ag / CdO electrical contact composite materials ha...

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Application Information

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IPC IPC(8): C22C32/00C22C1/05B22F1/02H01H1/0237
Inventor 申乾宏陈乐生乔秀清樊先平杨辉
Owner ZHEJIANG UNIV
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