(華中科技大學(xué) 材料成形與模具技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，武漢 430074)
摘 要: 利用CO2激光器，在45號(hào)鋼表面熔覆Ni45-CaF2 -WS2粉末制備自潤(rùn)滑復(fù)合涂層，研究熔覆涂層微觀組織和摩擦磨損性能及其影響規(guī)律。結(jié)果表明，熔覆過程中，WS2發(fā)生部分分解，形成新的潤(rùn)滑相CrxSy和CaWO4，CaF2的存在對(duì)熔池的流動(dòng)性有極大的改善；涂層的室溫及400 ℃摩擦性能測(cè)試也表明，復(fù)合自潤(rùn)滑涂層的摩擦因數(shù)顯著降低，且Ni45-7.5CaF2-7.5WS2(質(zhì)量分?jǐn)?shù)，%)涂層的摩擦磨損性能較佳。
關(guān)鍵字: Ni45-CaF2-WS2；激光熔覆；自潤(rùn)滑涂層；顯微組織；摩擦性能
（State Key Laboratory of Material Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract: Self-lubrication coatings were prepared by CO2 laser cladding of Ni45-CaF2-WS2 compound powders on a medium carbon steel. Microstructure and tribological properties of the laser clad coatings were investigated and analyzed. The results show that, partial WS2 powder decomposes to generate some new lubricants, such as CrxSy and CaWO4. During laser cladding process, the fluidity of laser-generated-pool has been improved by adding CaF2, the friction coefficients of coating reduce remarkably in the tribological properties test at room temperature and 400 ℃, and the laser cladding Ni45-7.5CaF2-7.5WS2 (mass fraction, %) coating presents lower friction coefficient and better wear resistance.
Key words: Ni45-CaF2-WS2; laser cladding; self-lubricating coating; microstructure; tribological properties
