影响烧结钽坯料致密度的因素

Factors Affecting Density of Sintered Tantalum Billet

采用金属钽粉为原料,通过冷等静压成型、真空垂熔烧结、轧制、拉拔等粉末冶金加工工艺制取电容器级钽丝。金属钽粉的微观形貌、粒度分布及化学成分等粉末特性,以及钽坯料加工过程及成型与烧结工艺过程特性,直接影响烧结后钽坯料的致密度,也将直接影响电容器级钽丝的理化性能。研究表明:钽粉的平均粒径在5.5~6.5μm时有利于钽坯料的烧结;钽粉的化学杂质含量高、等静压压力小、烧结炉的气氛差等因素不利于钽坯料的致密。

Using metal tantalum powder as raw material,capacitor grade tantalum wire was prepared by powder metallurgy processes such as cold isostatic pressing,vacuum vertical melting sintering,rolling and drawing.The characteristics of tantalum metal powder,such as microstructure,particle size distribution and chemical composition,as well as the characteristics of tantalum blank processing,forming and sintering process,directly affect the density of tantalum blank after sintering,and also directly affect the physical and chemical properties of capacitor grade tantalum wire.The results show that when the average particle size of tantalum powder is 5.5-6.5μm,it is beneficial to the sintering of tantalum blank.High chemical impurity content of tantalum powder,low isostatic pressure,poor sintering furnace atmosphere and other factors are not conducive to the density of tantalum blank.