Rare earth doped new cemented carbide with Ni-Co binder for mining

Abstract

A method, doping WC with La(NO₃)₃, of producing cemented carbide with rare earth was introduced. The effects of lanthanum on the mechanical properties and microstructure of WC-9(Co-75%Ni) cemented carbide were studied and a rock drilling experiment was carried out. The experimental results show that both transverse rupture strength (TRS) and hardness of WC-9(Co-75%Ni) rare earth cemented carbides can match that of WC-9Co cemented carbide, when La₂O₃/(Co + Ni) ratio is 0.3%, the abnormal growth of WC grain in the cemented carbide can be restrained effectively, the homogeneity of grain size in microstructure and the wear resistance are improved, which can be matchable to that of WC-9Co cemented carbide for mining.

Keywords

cemented carbide / rare earth / cobalt substitution / application

References

[1] LIU Chun-lin, YAN Ban-ming, FAN Zheng-kan, et al. Study on the new mining carbides with rare-earth addition[J]. Rare Metals and Cemented Carbides (in Chinese), 1995(2): 11–13.

[2] ZhangLi, ChenShu, HuShun-sui, et al.. Review on the way of addition and additive category of rare earth in cemented carbide[J]. Cemented Carbide, 1996, 13(2): 117-120(in Chinese)

[3] ASM Handbook Committee. Metals handbook Vol.8—Metallography, structures and phase diagrams[M]. American Society for Metals, 1973. 288.

[4] Metal Department of Zhongshan UniversityPhysicochemistry deta of rare earths (in Chinese) [M], 1978, Beijing, Metallurgical Industry Press: 314-314

[5] YuanYi, BaiYuan-qiang. Role of yttrium in cobalt based alloy and cemented carbide[J]. Powder Metallurgy Technology, 1995, 13(2): 93-98(in Chinese)

[6] WuYing-fang, YuanYi, WangXin-yi. Study on the rare earth phase in cemented carbide[J]. Powder Metallurgy Materials Science and Engineering, 1997, 2(1): 1-6(in Chinese)