Non-isothermal Oxidation Kinetics of WC-6%Co Cemented Carbides in Air

摘要：

　　The oxidation of WC-Co cemented carbides cutting tools is a key factor in determining tools life during dry and high speed cutting.Thus,its investigation is of great importance to the design and development of cutting tool materials.In this paper,the non-isothermal oxidation of WC-6%Co cemented carbides was carried out on simultaneous thermogravimetry-differential scanning calorimetry (TG-DSC) thermal analyzer (Netzsch STA 449C) between room temperature and 1 273 K with different heating rates (β=5,10,15 and 20 K/min) in a dry air atmosphere under the atmospheric pressure.On DSC curves,with the heating rate increasing from 5 K/min to 20 K/min,the extrapolated initial temperature (T(ei)),the peak temperature (Tp),and the extrapolated final temperature (Tef) of the oxidation of WC-6%Co cemented carbides increased from 957 K to 997 K,from 1014 K to 1079 K,and from 1030 K to 1094 K,respectively.The apparent activation energy (Ea) of the oxidation of WC-6%Co cemented carbides was 206.85 kJ/moL calculated by FWO method,and preexponential factor (A) was 5.02 × 109 min-1.The oxidation experiment data of WC-6%Co was in good agreement with R2 kinetic model.The reaction rate can be described by dα/dt=1010exp (-24 879/T)(1-α)1/2.

关键词： WC-6 Co non-isothermal oxidation kinetic

作者: Chen Liyong Yi Danqing Liu Huiqun Wang Bin

作者单位: School of Materials Science and Engineering,Central South University,Changsha,Hunan,410083,China;Key Laboratory for Nonferrous Materials Science and Engineering,Education Ministry,Central South University,Changsha 410083,China

会议类型: 国际会议

会议名称: 2012 Zhuzhou International Conference on Cemented Carbides(株洲硬质合金国际学术会议)

会议地点: 株洲

会议语种:英文

页码: 396-402

在线出版日期: 2012-09-12（万方平台首次上网日期，不代表论文的发表时间）