仲钨酸铵对Ag-Sn合金粉末的氧化作用

来源期刊：中南大学学报(自然科学版)1991年第1期

论文作者：温金海 林炳

文章页码：80 - 85

关键词：银合金; 锡; 金属粉末; 氧化; Wagner氧化理论

Key words：silver alloy; tin; metal powder; oxidation; wagner's theory of oxidation

摘    要：本文采用氧化增重法(TGA),研究了添加少量仲钨酸铵(APT)对Ag-Sn合金粉末的氧化作用,用X射线衍射仪、电子探针和金相观察分析了粉末氧化前后相的转变、氧化物的分布、形貌。结果表明,Ag-Sn+APT混合粉末的氧化规律服从Wagner理论;APT的分解产物及形成的新相Ag₂WO₄作为活性氧原子源,促进Sn的氧化;添加剂APT在0～2.26wt-%成分范围内和相同温度、相同氧化时间条件下,氧化速率随添加量增加而加快;随氧化温度的提高,氧化速率加大,如在800℃下的氧化速率大于700℃下的氧化速率。

Abstract: Oxidation processes of Ag-Sn alloy powders with a small quantity of additional APT were studied by gravimetric measurement (TGA). Microstructure, change of phase, distribution and morphology of oxide were analysed by X-ray diffractometer, scanning electron microscope and optical microscope. The results showed that oxidation process of the mixture agreed with Wagner's theory; dissociated production of APT and new phase Ag₂WO₄ formed in the oxidation were regarded as the sources of active oxygen atom, and enhanced the oxidation of Tin; when the temperature and time were the same, and in the component of 0～2. 26wt-%, oxidation ratio increased with the increase of APT.