(1. 武漢理工大學(xué) 材料復(fù)合新技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，武漢 430070； 2. 武漢理工大學(xué) 能源與動(dòng)力工程學(xué)院，武漢 430063)
摘 要: 采用超音速火焰噴涂(HVOF)制備普通微米和微納米WC-10Co4Cr金屬陶瓷涂層，使用光學(xué)顯微鏡、掃描電鏡和X射線衍射儀方法分析涂層的組織結(jié)構(gòu)；測(cè)量涂層的顯微硬度、孔隙率及開(kāi)裂韌性；采用超聲振動(dòng)空蝕裝置在淡水介質(zhì)中研究WC-10Co4Cr涂層的抗空蝕性能和空蝕行為，并探討涂層的空蝕機(jī)理。結(jié)果表明：采用HVOF制備的微納米WC-10Co4Cr涂層主要由WC相、非晶CoCr相和微量的W2C相組成，涂層中WC未產(chǎn)生明顯的脫碳現(xiàn)象；HVOF工藝制備的微納米WC-10Co4Cr涂層的力學(xué)性能和抗空蝕性能明顯優(yōu)于普通WC-10Co4Cr涂層的，在穩(wěn)定空蝕階段淡水中微納米涂層的抗空蝕性能比普通涂層的提高大約1倍。
關(guān)鍵字: WC-10Co4Cr涂層；微納米；HVOF；空蝕
（1. State Key Laboratory of Advanced Technology for Materials and Processing, Wuhan University of Technology, Wuhan 430070, China; 2. School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China）
Abstract:Micro-nano and conventional WC-10Co4Cr cermet coatings were deposited by high velocity oxygen fuel spraying (HVOF), and the coating structures were investigated by SEM, OM and XRD. Microhardness, porosity and fracture toughness of the coatings were measured. Cavitation erosion resistance of the coatings were carried out by ultrasonic vibration cavitation equipment in fresh water medium, and cavitation behavior was analyzed and the cavitation mechanisms were explored. The results show that the phase compositions of the micro-nano WC-10Co4Cr coating produced by HVOF were mainly composed of WC, amorphous CoCr and a little W2C, and obvious WC decarburization of the coating is not discovered. The mechanical properties and cavitation erosion resistance of the micro-nano WC-10Co4Cr coatings deposited by HVOF are much more superior to conventional one. The cavitation erosion resistance of the micro-nano WC-10Co4Cr coatings sprayed by HVOF is enhanced approximately one times than that of conventional one at stable cavitation period in fresh water.
Key words: WC-10Co4Cr coating; micro-nano; high velocity oxy-fuel spraying; cavitation erosion
