(1. 中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083；
2. 萊蕪職業(yè)技術(shù)學(xué)院 萊蕪市粉末冶金先進(jìn)制造重點實驗室，萊蕪 271100；
3. 湖南大學(xué) 化學(xué)化工學(xué)院，長沙 410082；4. 自貢長城硬面材料有限公司，自貢 643011)
摘 要: 采用超音速火焰噴涂(HVOF)工藝制備微米結(jié)構(gòu)WC-10Co4Cr涂層，分別采用金相顯微鏡、掃描電鏡 (SEM)、X射線衍射(XRD)和滑動磨損設(shè)備分析涂層的微觀結(jié)構(gòu)和滑動磨損行為。結(jié)果表明：采用液體煤油燃料HVOF噴涂的微米結(jié)構(gòu)WC-10Co4Cr涂層的脫碳程度較低，涂層中僅出現(xiàn)WC和W2C相，而無η相(Co3W3C、 Co6W6C)以及軟相W。涂層微觀結(jié)構(gòu)致密，孔隙率約為1%，平均顯微硬度為1 322HV0.3；在相同試驗條件下，WC-10Co4Cr涂層的摩擦因數(shù)(約0.8)高于不銹鋼(1Cr18Ni9Ti)的摩擦因數(shù)(約0.5)，其滑動體積損失量僅為不銹鋼涂層的1/146，具有優(yōu)異的抗滑動磨損性能。涂層在滑動磨損過程中首先是粘結(jié)相的脫落，然后是WC顆粒的磨損。
關(guān)鍵字: WC-10Co4Cr涂層；超音速火焰噴涂(HVOF)；滑動磨損
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Key Laboratory for Powder Metallurgy in Advanced Manufacturing,
Laiwu Vocational and Technical College, Laiwu 271100, China;
3. School of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
4. Zigong Cement Carbide Co., Ltd., Zigong 643011, China）
Abstract:The micro-structured WC-10Co4Cr coatings were deposited by the high-velocity oxy-fuel (HVOF) spray process. The microstructure and sliding wear behavior of the coatings were respectively characterized by optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and sliding wear test. The results show that decarborization of the coating is low by using liquid kerosene as fuel. Only WC and W2C exist in the sprayed coating, while there is no η phase (Co3W3C, Co6W6C) or the soft phase W. The coating is highly densified with porosity as low as about 1% and the microhardness of the coating is 1 322 HV0.3. The coefficient of friction for WC-10Co4Cr coating (about 0.8) is higher than that for 1Cr18Ni9Ti stainless steel (about 0.5) and the volume loss of sliding wear is only 1/146 of that of 1Cr18Ni9Ti, indicating the excellent sliding wear resistance performance of the WC-10Co4Cr coating. The failure of the WC-10Co4Cr coating during sliding wear is due to binder phase loss followed by wearing of WC particles.
Key words: WC-10Co4Cr coating; high-velocity oxy-fuel (HVOF) spray; sliding wear
