Effects of alloy additives on oxidation behavior and correlative characteristics of WC-based cemented carbides
WANG Chunguang1, ZHANG Li1, HUANG Xiang1, NIE Renxin1, ZHONG Zhiqiang2, LONG Jiawei1
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Chongyi Zhangyuan Tungsten Co., Ltd., Ganzhou 341300, China
Abstract：To explore the methods to improve the oxidation resistance at high temperature and the physical and mechanical properties simultaneously. Thus, this research designed WC-6Co-6Ni, WC-6Co-6Ni-1Cr3C2, WC-6Co- 6Ni-1CeO2 and WC-12Co-1CeO2 WC-based cemented carbides, corresponding to alloys 1#-4#, respectively. The microstructure, physical and mechanical properties and oxidation behavior of the alloys at 700 ℃ for 16 h were investigated by comparison. The results show that the presence of rare earth-containing oxide dispersion phase in the alloy does not lead to the decrease of alloy strength, and the alloy hardness follows the coupling law of hardness, grain size and volume fraction of the phase components. The hardness of alloy 4# is the highest, followed by alloy 2#. The influence of Co and Ni binder metals on the hardness of cemented carbides is significant. Both Cr3C2 and CeO2 can significantly improve the oxidation resistance of the alloys at 700 ℃, but the improvement effect of Cr3C2 is better than that of CeO2. The high temperature oxidation resistance and physical and mechanical properties of WC-based cemented carbide can be improved synchronously by adding appropriate amount of Cr3C2 and CeO2, and using Ni to partially replace Co.
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2023, Vol. 28 
