Oxidation behavior of WC-Co hard metal with designed multilayer coatings by CVD

被引：36
作者：
Chen, Xiangming [1 ,2 ]
Liu, Huiqun [1 ,3 ]
Guo, Qinghua [1 ,3 ]
Sun, Shunping [1 ,3 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Zhuzhou Cemented Cutting Tools Co Ltd, Zhuzhou 412007, Hunan, Peoples R China
[3] Cent S Univ, Minist Educ, Key Lab Nonferrous Mat, Changsha 410083, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2012年 / 31卷
关键词：
WC-Co alloy; CVD multilayer coatings; Oxidation kinetic; Microstructure; CUTTING TOOLS; CEMENTED CARBIDES; WEAR BEHAVIOR; ABRASIVE WEAR; RESISTANCE; KAPPA-AL2O3; STRENGTH;
D O I：
10.1016/j.ijrmhm.2011.10.012
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Multilayer coatings composed of TiN, TiCN, alpha-Al2O3 and kappa-Al2O3 were designed and then deposited on WC-Co alloy by chemical vapor deposition (CVD) technique, the samples of WC-Co alloy with multilayer coatings were oxidized in the temperature range of 600 degrees C-950 degrees C for various times in a Muffle furnace, and weight gain was measured by electronic balance. Phase component and microstructure evolution of coating samples after oxidation were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the oxidation resistance of WC-Co alloy was improved markedly after deposition of multilayer coatings. The oxidation kinetics of multilayer coating samples obeyed linear law and diffusion-controlled parabolic law at different oxidation conditions. The oxidation product of coatings was rutile TiO2. The sample exhibited excellent oxidation resistance when the outermost layer was alpha-Al2O3, which was consistent to the results of apparent activation energy of oxidation reaction. The oxidation resistance of multilayer coatings was improved with the increase of thickness of alpha-Al2O3 layer. The kappa-Al2O3 transformed into alpha-Al2O3 over 900 degrees C. The interface between TiN and TiCN disappeared in the coating sample without alpha-Al2O3 and kappa-Al2O3 layer. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：171 / 178
页数：8
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