Method for preparing AgSnO2 contact material by spray co-deposition reaction

Abstract

The invention discloses a method for preparing AgSnO2 contact material by a spray co-deposition reaction, which comprises the following steps: 1, processing of Ag2O powder; 2, preparation of alloy fusant; 3, preparation of composite material by the spray co-deposition reaction; 4, in situ chemical processing of the composite material; and 5, preparation of sliver rear earth oxide contact materialby extrusion, rolling and drawing. The method of the invention has easy control, less pollution, and low production cost and can realize the industrialization production. The prepared AgSnO2 contact material has higher processability compared with the AgSnO contact material prepared by using a powder metallurgy method, an internal oxidation method and chemical precipitation process and the like, has fresh reaction interface of Ag and SnO2, can preferably solve the problem of temperature rising of the contact material and improve the comprehensive property of the material.

Description

technical field [0001] The invention belongs to the technical field of metal-based composite materials, and in particular relates to a method for preparing silver-tin oxide electrical contact materials by spray co-deposition reaction. Background technique [0002] AgCdO electrical contact material has been widely used at home and abroad for a long time because of its excellent arc corrosion resistance, welding resistance and low contact resistance. However, due to the existence of cadmium and its compounds, the production, use and recycling of AgCdO materials are faced with the problem of cadmium pollution; in addition, cadmium and its compounds are toxic, harmful to the human body, and will endanger human life in severe cases. Silver tin oxide (AgSnO 2 ) Electrical contact material is a new type of non-toxic electrical contact material that has developed rapidly in recent years. It has good thermal stability, arc corrosion resistance and good welding resistance. It is curr...

AI Technical Summary

Problems solved by technology

Although these known preparation methods have all obtained AgSnO 2 Composite materials, but there are obvious deficiencies, mainly as follows: AgSnO prepared by powder metallurgy 2 For electrical contact materials, tin dioxide (SnO 2 ) relies on external mechanical addition, which requires higher powder particle size and purity, which increases the cost of raw materials; at the same time, after sintering, Ag and SnO 2 The interface bonding of the material is poor, which increases the brittleness of the material, which leads to an increase in the subsequent processing steps of the material, complex processes, and is not conducive to large-scale production; the preparation of AgSnO by internal oxidation method 2 When the material is electrically contacted, dense SnO will be generated on the surface of the AgSn alloy 2 layer, will prevent the alloy from continuing to oxidize, so it is necessary to add indium (In) to promote the internal oxidation of the alloy, but the price of In is expensive, the resource reserve is less, and the cost is higher; the chemical precipitation method prepares AgSnO 2 When electrical contact materials, there are pollution problems of acid, alkali, and salt; the production cycle is long and the cost is high, and there are also Ag and SnO 2 The problem of poor bonding at the tin interface

[0004] Patent CN1082235C announced on April 3, 2002 discloses a synthesis method for preparing silver-tin dioxide electrical contact materials. Although this method can better solve the problem of the reaction interface, it needs to go through a long time of mixing and multiple times. Sintering, the process is complicated, and the particle size and purity of the raw materials are high, which increases the production cost; in addition, the AgSnO prepared by this method 2 Coarse grains, subsequent processing is still very difficult; in addition, there is still room for improvement in terms of high temperature rise of materials