Effects of gradient structure on the microstructures and properties of coated cemented carbides

作     者：Li Chen Enxi Wu Fei Yin Jia Li 

作者机构：State Key Laboratory for Powder Metallurgy Central South University Changsha 410083 China Zhuzhou Cemented Carbide Cutting Tools Co. Ltd. Zhuzhou 412007 China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2006年第13卷第4期

页      面：363-367页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：cemented carbide chemical vapor deposition (CVD) coating gradient structure 

摘      要：The effects of gradient structure on the microstructure and properties of coated cemented carbides were researched with optical microscopy （OM）, scanning electron microscopy （SEM）, strength measurements, and cutting tests. It shows that vacuum sintering of WC-Ti（C, N）-TaC-Co cemented carbides results in the formation of a surface ductile zone. The ductile zone prevents crack propagation and leads to the increase of transverse rupture strength of the substrate. The impact resistance of coated gradient inserts was obviously improved on the basis of maintaining resistance to abrasion and the forming mechanism of the gradient structure was also analyzed.