Effect of La2O2S and LaCoO3 Phases on the Wear Characteristics and Residual Stress of WC-Co Alloy
During the sintering process of WC-11%Co-0.71%Cr3C2-0.06%La2O3 alloy (cemented carbide) with a WC+β+η structure,whereβ is a cobalt-based solid solution binder phase and η is a carbon deficiency phase,a dispersedly distributed La2O2S phase and an LaCoO3 phase in small amount were formed in situ on the sinter skin (surface).To analyze the wear characteristics and residual stress,as well as the related binding strength between the new phase and the WC+β matrix,both the sinter skin and the ball-milled skin (surface) of the same sample were examined by a scanning electron microscope and two kinds of X-ray diffractometers.The results show that there is a good binding strength between the WC+β matrix and La2O2S phase,and the wear resistance of La2O2S is matchable to the matrix.Dispersedly distributed La2O2S or LaCoO3 phase on the surface can endow WC-Co alloy with a self-lubricating function and a high wear resistance performance.The synergetic wear of the La2O2S,LaCoO3,WC andβ phases resulted in an approximately 28% decrease of residual stresses in WC phase.Nevertheless,a compressive stress state still remains.
cemented carbide rare earth La2O2S wear characteristics residual stress self-lubricating function
Zhang Li Chen Shu Nan Qing Xie Mingwei Wu Houping Xiong Xiangjun
State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China Changsha Mining and Metallurgy Research Institute Co.Ltd.,Changsha 410012,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
342-346
2012-09-12（万方平台首次上网日期，不代表论文的发表时间）