钎接界面的动态金属学行为  

DYNAMIC METALLURGICAL BEHAVIOR OF BRAZING INTERFACE OF STEEL ROD

作　　者：陈祝平[1] 王可寰[1] 

机构地区：[1]煤炭科学研究总院

出　　处：《煤炭学报》1998年第2期175-178,共4页Journal of China Coal Society

基　　金：煤炭科学基金;国家"八五"重点科技攻关子专题资助

摘　　要：通过钎接界面动态金属学研究，揭示了界面熔解－扩散过程中硬质合金亚表层形成贫钴带和碎晶区从而成为微观裂纹萌发源的事实．该行为系导致破岩刀具早期脱断齿失效的主要原因之一．采用自催化沉积对硬质合金表面改性，可有效建立钴栅，阻止钴熔失与碳化钨熔蚀，增强焊缝强度，降低早期脱断齿率，并为低钴型硬质合金的选用提供了基础．Study of the dynamic metallurgical behavior of the brazing interface of cobalttungsten insert and steel rod revealed a fact that a poor cobalt belt and a clastic crystalline zone formed on the subsurface of cobalttungsten carbide in the dynamic process of fusion and diffusion, which, in turn, brought about microscopic cracks. This behavior was considered to be one of the main reasons for detachment of the inserts and failures of cutting tools at early stages. Surface modification with selfcatalytic deposition can built a cobalt barrier, can control loss of cobalt by the fusion and melting of tungsten carbide, can increase the strength of the weld, reduce the rate of detachment of the inserts at the early stages and lay a foundation for application of low cobalt inserts.

关 键 词：硬质合金 钎接界面 动态金属学 表面改性 钎具 

分 类 号：TD421.25[矿业工程—矿山机电] TH11[机械工程—机械设计及理论]