摘要:
采用自制的多元复式碳(氮)化物陶瓷粉末制备少Mo的(Ti,W,Ta,Mo)(C,N)-(Co,Ni)金属陶瓷。研究了粉末相组成对金属陶瓷组织及性能的影响。结果表明,多元复式碳(氮)化物固溶体的晶格常数与元素的固溶度有很好的对应关系。金属陶瓷中含Ta,W等重金属元素的多元复式碳化物的加入,有利于重金属元素向粘结相中均匀扩散,相对减缓了低元相Ti(C,N)的分解,使材料的性能得到较大的提高,组织主要表现为单层环形相结构特征,富Ti硬质相减少,富(Ta,W)硬质相增多,且晶粒细小,无团聚现象。
关键词:
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粉末相组成
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金属陶瓷
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组织
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性能
Abstract:
(Ti,W,Ta,Mo)(C,N)-(Co,Ni) cermets of less amount of Mo were produced using the self-made pre-alloyed solid solution powders of carbides or/and nitrides. Effects of phase composition of powders on the microstructure and properties were studied. The results suggest that the good corresponding relationships between the lattice constant of the pre-alloyed solid solution powders and the solid solution extent of elements are obtained. The addition of the pre-alloyed solid solution powders including the heavy metal elements of Ta and W is favorable to the spreading of heavy metal elements in the binders. The dissolution of Ti(C,N) reduces. The performance of cerments is improved. The cermets have the monolayer core-rim structure. The content of hard grains of wealthy Ti reduces and the content of hard grains of wealthy Ta and W increases. The grains of cerments are fine. The features of aggregation are not observed.
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