Microstructure and Properties of the Cermet Coating Prepared by Spraying Multimodal WC-17Co Powders Using HVOF Technique
CHEN Xiao1,2, BAI Xiaobo2, WANG Hongtao2, JI Gangchang2
1 Xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing, Xinyu University, Xinyu 338004; 2 Jiangxi Province Engineering Research Center of Materials Surface Enhancing & Remanufacturing, Jiujiang University, Jiujiang 332005
Abstract: The purpose of the present work is to explore the microstructure and properties of the HVOF (high velocity oxygen fuel) sprayed cermet coa-ting of WC-17Co. We conducted the preparation of the cermet coatings under various oxygen flow rates (322 L/min,402 L/min,482 L/min and 543 L/min) by spraying and depositing multimodal WC-17Co powders (60% nano-WC and 40% micro-WC) onto Q235 steel substrate, and characterized and determined the coatings’ microstructures, phase compositons, microhardness values and wear resistance performances by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), hardness test and abrasion test, respectively. The results showed that the decrease of the oxygen flow rate could cause more serious decomposition of WC phase, and WC phase content reaches the minimum value at the oxygen flow rate of 322 L/min. It could also be concluded that the oxygen flow rate had significant influences on the contents of W, W2C, Co3W3C phases (inverse correlation), the microhardness (positive correlation), and the wear resistance performance (positive correlation) of the resultant coating. When the oxygen flow rate during HVOF spraying process was controlled at 543 L/min, the sprayed coating had a composition principally of WC phase, a maximum microhardness value ((979±52.9)Hv0.3), as well as a small weight loss ((6.6±0.57) mg) after wear testing.
陈枭, 白小波, 王洪涛, 纪岗昌. 超音速火焰喷涂多尺度WC-17Co粉末制备的金属陶瓷涂层的组织结构与性能[J]. 材料导报, 2019, 33(4): 684-688.
CHEN Xiao, BAI Xiaobo, WANG Hongtao, JI Gangchang. Microstructure and Properties of the Cermet Coating Prepared by Spraying Multimodal WC-17Co Powders Using HVOF Technique. Materials Reports, 2019, 33(4): 684-688.
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2019, Vol. 33 
