(Ti,W,Ta)(C,N)_p/Ti(C,N)基金属陶瓷的组织与性能

采用自制的多元复式碳氮化物陶瓷粉末 ((Ti,W,Ta) (C,N) p)制备 (Ti,W,Ta) (C,N) p/Ti(C,N)基金属陶瓷。研究了 (Ti,W,Ta) (C,N) p 粉末的组织结构特征及其加入对金属陶瓷的组织及性能的影响。结果表明 ,多元复式碳氮化物粉末的晶格常数与元素的固溶度有很好的对应关系 ,调整粉末中元素的固溶度可控制粉末的晶格常数 ,进而控制材料的性能。 Ti(C,N)基金属陶瓷中 (Ti,W,Ta) (C,N) p 粉末的加入 ,有利于重金属元素 W和 Ta向粘结相中扩散 ,从而降低了硬质相在粘结相中的溶解度 ,阻碍了晶粒长大。(Ti,W,Ta) (C,N) p/Ti(C,N)基金属陶瓷各项性能指标优于 Ti(C,N)基金属陶瓷和国外对应的金属陶瓷牌号 CT5 2 5的产品。强化机制主要表现为细晶强化与固溶强化。

MICROSTRUCTURE AND PROPERTIES OF (Ti,W,Ta)(C,N)p/Ti(C,N)-BASED CERMETS

(Ti,W,Ta)(C,N) p/Ti(C,N)-based cermets were produced using the self-made pre-alloyed solid solution powders of (Ti,W,Ta)(C,N) p. The microstructure of (Ti,W,Ta)(C,N) p powders and effects of (Ti,W,Ta)(C,N) p addition on the microstructure and properties of cermets 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 performance of cermets can be improved by controlling the solid solution extent of elements and the lattice constant of powders. (Ti,W,Ta)(C,N) p addition is favorable to the spreading of heavy metal elements of W and Ta in the binders. The dissolution of hard phases reduce. The grains of cermets are refined. The properties of (Ti,W,Ta)(C,N) p /Ti(C,N)-based cermets are superior to those of Ti(C,N)-based cermets and CT525 products made in foreign country. The strengthening mechanisms are chiefly grains refining and solution reinforcing.