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WC coating deposited by electric spark process on high speed steel

Zhang Hui1,Ma Yuejin1,Hao Jianjun1,Chen Zhiqiang2(1.Agricultural University of Hebei,Baoding 071001,Hebei,China;2.Zhonghang Huiteng Windpower Equipment Co.,Ltd,Baoding 071001,Heibei,China)  
WC cemented carbide coating was deposited on W18Cr4V high speed steel with electric spark deposition machine modeled DZ-1400,and the WC was used as electrode and the argon gas as shielding gas.The microstructure of coatings was investigated with microscope.The micro-hardness and thickness of coatings was tested by hardness testing device.The results by drilling on cast iron and 45# steel showed that the average tool life of the WC coating on high speed steel twist drill is 10 and 13 times than those of the uncoated drills and the wear rate of the twist drill is significantly reduced.
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