Preparation method of silver tin oxide electric contact materials

Abstract

The invention provides a preparation method of silver tin oxide electric contact materials. Firstly, a method for preparing a solution is adopted, an aqueous solution containing silver nitrate and tin nitrate reacts with a sodium carbonate aqueous solution containing a sodium hexametaphosphate dispersing agent, a mixture containing silver carbonate and tine carbonate is obtained under the action of high-speed stirring and the sodium hexametaphosphate dispersing agent, silver tin oxide compound powder with fine particles is obtained through the processing of filtering, forging and mechanical grinding, the preparation of the silver tin oxide electric contact materials uniform in component in the subsequence powder metallurgy process is facilitated, and the preparing process is environmentally friendly. The preparation method of the silver tin oxide electric contact materials is simple and easy to control, short in production cycle, low in pollution, low in cost and favorable for industrial production.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a method for preparing an electrical contact material of silver tin oxide, which is mainly used in the production of electrical contact materials for low-voltage electrical appliances. Background technique [0002] Silver tin oxide electrical contact material is a new generation of non-toxic and environmentally friendly electrical contact material replacing silver cadmium oxide contact material. It has excellent anti-welding performance, good resistance to burning loss, high electrical life and environmental protection performance, and is widely used Used in various contactors, relays, circuit breakers and switches. [0003] At present, there are three main methods for preparing silver tin oxide electrical contact materials at home and abroad: powder mixing method, internal oxidation method, and chemical method. The mixed powder method is to mix silver powder and t...

AI Technical Summary

Problems solved by technology

In this method, such as Chinese patents CN03113533 and CN201210130542.1, in order to ensure the morphology of metallic silver when it is reduced and precipitated to ensure uniformity, it is necessary to add ammonia water to complex the silver ions. Subsequent water treatment to meet environmental protection requirements brings great pressure, and the dispersion of the chemical components of the materials prepared by this method is not very uniform