用化学共沉淀法制备Ag-W复合粉

来源期刊：中南大学学报(自然科学版)1991年第6期

论文作者：曾德麟 周红翠

文章页码：76 - 82

关键词：化学共沉淀; 银—钨复合粉; 制备方法

Key words：chemical coprecipitation; silver-tungsten composite powder; preparation method

摘    要：用氢还原Ag₂WO₄制得的Ag-W复合粉烧结的Ag-W电接触合金由于晶粒细和成分均匀,能提高合金的抗熔焊性和电腐蚀性能。本文研究了Ag₂WO₄-Ag₂CO₃共沉淀的生成条件及还原工艺对所得Ag-W复合粉性能的影响,证明:AgNO₃溶液的pH值和共沉淀时Na₂CO₃的加入量影响共沉淀料的Ag含量;反应温度,特别是二阶段还原的温度和时间决定了复合粉的费氏平均粒度。

Abstract: Ag-W electrical contacts made from composite powders produced by H₂-reduction of a precipitated silver tungstate have excellent electrical propertiesbecause of their finer grain structure and homogeneous chemical compositions.In this paper, a silver tungstate and silver carbonate mixture coprecpitated by an aqueous solution reaction has been investigated with respect to the reaction conditions and the influence of reduction procedure on the properties of the composite powder. The results showed the pH-value of AgNO₃ solution and the amount of added Na₂CO₃ have a significant effect on the silver content of thecoprecipitated mixture, and the reaction temperature especially the temperatureand time of the second stage reduction are the main parameters affecting themean particle size of the composite powder.