【摘要】 MoSi₂以其高熔点（2030℃）、高使用温度（>1600℃）、良好的导热性和导电性等优良性能,被认为是继镍基高温合金之后极具竞争力的新型高温结构候选材料之一。但是,MoSi₂的低温脆性和中温氧化碎裂（PEST）难以克服。本文以Mo、Si合金粉末为原料,采用激光熔覆技术,在纯镍基材上制成MoSi₂金属硅化物复合材料涂层。分析了涂层的显微组织,测试了涂层的显微硬度。更多还原

【Abstract】 The metal siliclde MoSi2 is regarded as a promising candidate high-temperature structure material due to its outstanding balance of high melting point (2030℃ ) .lower density(6. 24g/cm3) , excellent oxidation resistance. MoSi2 metal silicide composite coating was fabricated on substrate of nickel- plate by laser cladding using Mo - Si elemental powder blends. Non -equilibrium rapid solidified microstructure was characterized by SEM.XRD and EDS. Microhardness of the composite coating was measured by MH6 semi automatic Vickers hardness tester.更多还原