激光熔覆硅化物涂层强化相的研究进展

Research Progress on Strengthening Phase in Laser Clad Silicide Coating

综述了采用激光熔覆方法制备硅化物涂层中原位生成的强化相类型、分布以及强化机理,主要分析了各种强化相强化的涂层在室温、高温条件下的摩擦磨损性能。三元Laves相作为涂层强化相的研究最多,应用较成熟,是一类理想的激光熔覆涂层强化相。σ相和Cr3Si相因自身存在严重的室温脆性,应用受到一定限制。Me5Si3型相有突出的抗磨粒和粘着磨损的能力,其作为强化相应用到激光熔覆涂层中具有很大潜力。MeSi2型相自身的高熔点特性使其在制备高温耐磨涂层过程中得到应用。对过渡族金属与硅通过激光熔覆制得耐磨涂层的应用做出了展望。

The type,distribution and strengthening mechanism of strengthening phase generated in situ in silicide coating by laser cladding are reviewed.The friction and wear performance of coatings with different strengthening phase under room or high temperature conditions are mainly analyzed.The ternary Laves phase as the most studied and applied coating strengthening phase,is a kind of ideal laser cladding coating strengthening phase.Because of the existence of serious room-temperature brittleness,σphase and Cr3 Si phase are prevented from applying in industry.Good combination of anti-abrasive and anti-adhesive wear ability had made Me5Si3 phase exhibiting promising prospect in the application of laser cladding strengthening phase.Due to the high melting point,MeSi2 phase is applied to produce coating with excellent wear resistance under high temperature.The characteristics of diversified strengthening phase are summarized to forecast the prospect to the application of transition metal and silicon created wearable coating which fabricated by laser cladding process.