Method for preparing atomizing silver tin oxide electrical contactor material containing additives

Abstract

The invention discloses a method for preparing atomizing silver tin oxide electrical contactor material containing additives. The method comprises the following steps: (1) calculating the dosages of needed pure silver ingots, pure tin ingots and salt compounds containing adding elements according to the compounding ratio of the silver tin oxide electrical contactor material needed to be prepared, and weighing for reverse; (2) atomizing the pure silver ingots and the pure tin ingots into silver tin alloy powder; (3) preparing the salt compounds containing the adding elements into aqueous solution or ethanol solution, adding the silver tin alloy powder, mixing materials to obtain silver tin alloy powder sizing agents in which the salt compounds containing the adding elements are distributed evenly; (4) drying and smashing the sizing agents to obtain the silver tin alloy powder in which the salt compounds containing the adding elements are distributed evenly; (5) performing the processes of pre-oxidizing, isostatic pressing, sintering and extruding for the obtained silver tin alloy powder. According to the method, the problem of additive aliquation caused by the traditional atomization and powder mixing technology is well solved, and the densifying degree, the processing performance, the yield and the electrical performance of the materials are improved.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a method for preparing an additive-containing atomized silver-tin oxide electrical contact material. Background technique [0002] From the perspective of environmental protection and human health, the universal silver cadmium oxide (AgCdO) contact material is gradually eliminated from the market. Silver tin oxide (AgSnO 2 ) is a new type of non-toxic electrical contact material that has developed rapidly in recent years, AgSnO 2 The contact material exhibits excellent wear resistance, welding resistance and arc erosion resistance, and has less material migration and uniform surface wear, making it the best substitute for AgCdO. But AgSnO 2 The contact resistance of the contact material is relatively large and the temperature rises, which seriously affects the electrical performance and limits the application of its material. [0003] Studies have shown that AgS...

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Problems solved by technology

Additives in this process are smelted together with Ag and Sn and then atomized. Due to the small amount of additives and the fact that they are easy to agglomerate when oxidized, it is easy to cause the additives to not be evenly distributed in the matrix. Affects the modification of the obtained contact material, and the wettability of silver and tin oxide is not good enough

[0005] The chemical co-deposition method mainly refers to the preparation of AgSnO by co-deposition process. 2 The most representative contact material is to add a precipitant to the silver nitrate solution containing tin oxide powder. This method prepares AgSnO with more uniform structure and higher electrical properties. 2 However, processing the powder through chemical methods will cause serious pollution to the environment, and there are also disadvantages such as cumbersome process, high production cost, and long processing cycle.

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