Study on the Microstructure Evolution of WC-10% Co Cemented Carbides during Sintering by Coercive Force
Microstructural evolution of WC-10%Co alloy with two different WC particle average size during sintenng was studied by coercive force.The alloy was sintered at five different temperatures from 1200 to 1450℃ respectively,then cooled down to room temperature.The shrinkage of pores,migration of liquid phase,homogenization of microstructure and coercive force under different sintering temperatures were studied.It is found that during heating the microstructure of cemented carbides undergoes a process from relatively homogeneous to unhomogeneous and then to homogeneous again,meanwhile the value of coercive force undergoes descent to ascent and then descent,which two phenomenons become more dramatic with the reduction of WC particle size.Results show that the more homogeneous the microstructure is the higher coercive force would be.An improved coercive force model is established which can explain the relevance between coercive force and homogeneity of microstructure well.This model shows that the coercive forces is determined by the original magnetic domain of cobalt and the area of WC/Co interfaces which is influenced by the WC particle size and the distribution of cobalt.
cemented carbides coercive force sintering shrinkage microstructure
Xie Wen Huang Wenliang Huang Qianbao Wang Shequan
Zhuzhou Cemented Carbide Cutting Tools Limited Company,Zhuzhou Hunan 412007,China
国际会议
2012 Zhuzhou International Conference on Cemented Carbides(株洲硬质合金国际学术会议)
株洲
英文
417-424
2012-09-12（万方平台首次上网日期，不代表论文的发表时间）