自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第22卷    第6期    总第82期    1991年12月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:(1991)06-76-7
用化学共沉淀法制备Ag-W复合粉
曾德麟; 周红翠

(粉末冶金研究所)

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:AgNO_3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。

 

关键字: 化学共沉淀; 银—钨复合粉; 制备方法

PREPARATION OF Ag-W COMPOSITE POWDERS USING CHEMICAL COPRECIPITATION METHOD
Zeng Delin;Zhou Hongcui

Powder Metallurgy Research Institute

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.

 

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

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号