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Effects of gradient structure on the microstructures and properties of coated cemented carbides
作者姓名:Li  Chen  Enxi  Wu  Fei  Yin  Jia  Li
作者单位:[1]State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China [2]Zhuzhou Cemented Carbide Cutting Tools Co. Ltd., Zhuzhou 412007, China
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.

关 键 词:硬质合金  CVD  SEM  涂层  梯度结构
收稿时间:2005-09-11

Effects of gradient structure on the microstructures and properties of coated cemented carbides
Li Chen Enxi Wu Fei Yin Jia Li.Effects of gradient structure on the microstructures and properties of coated cemented carbides[J].Journal of University of Science and Technology Beijing,2006,13(4):363-367.
Authors:Li Chen  Enxi Wu  Fei Yin  Jia Li
Affiliation:1. state Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;Zhuzhou Cemented Carbide Cutting Tools Co. Ltd., Zhuzhou 412007, China
2. state Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
3. Zhuzhou Cemented Carbide Cutting Tools Co. Ltd., Zhuzhou 412007, China;Zhuzhou Cemented Carbide Cutting Tools Co. Ltd., Zhuzhou 412007, China
4. Zhuzhou Cemented Carbide Cutting Tools Co. Ltd., Zhuzhou 412007, China
Abstract: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.
Keywords:cemented carbide  chemical vapor deposition (CVD)  coating  gradient structure
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