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《Journal of University of Science and Technology Beijing》 2006-07
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Preparation and properties of Al_2O_3/WC-10Co/ZrO_2 cermets

SHI Xiaoliang, SHAO Gangqin, DUAN Xinlong, XIONG Zhen, YANG HuaState Key Laboratory of Advanced Technology for Materials Synthesis & Processing, Wuhan University of Technology, Wuhan 430070, China  
Al_2O_3/WC-10Co/ZrO_2 cermets were prepared by a hot-pressing process by using WC-10Co nanocomposite powder, Y_2O_3 stabilized nanocrystalline ZrO_2 powder and submicron Al_2O_3 powder. The influences of sintering temperature on the microstructure, grain size and properties were investigated according to the density, fracture toughness, Rockwell A hardness (HRA), hysteresis loops and scanning electron microscopy (SEM) micrographs of fractured surfaces of the specimens. The results show that the composite powders (WC-10Co (50%)/Al_2O_3(40%)/ZrO_2(10%)) after being high-energy ball-milled for 48?h was hot-pressing sintered at 1?450?℃, then submicron Al_2O_3/WC-10Co/ZrO_2 cermets with an average grain size of less than 1?μm and better properties of 97.5% in relative density, 7.446?8?MPa·m 1/2 in fracture toughness, HRA 94.0 is achieved.
【Fund】: 教育部科学技术重点研究项目(No.105123);; 武汉理工大学校基金资助课题(No.xjj2005166)
【CateGory Index】: TF125
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