摘要
以Ni-42Mo-28Si和Ni-36Mo-24Si(质量分数计)合金粉末为原料,利用激光熔敷技术在1Cr18Ni9Ti不锈钢基材表面制得由三元金属硅化物Mo2Ni3Si初生树枝晶和枝晶间Mo2Ni3Si/NiSi共晶组织组成的复合材料涂层,考察了涂层镍含量及Mo2Ni3Si初生相体积分数对涂层在滑动干摩擦下的耐磨性的影响.结果表明:激光熔敷Mo2Ni3Si/NiSi金属硅化物复合材料涂层在滑动干摩擦条件下具有优异的抗磨性能;随着涂层中三元金属硅化物Mo2Ni3Si初生相体积分数的增加,涂层的耐磨性提高,摩擦系数降低;激光熔敷Mo2Ni3Si/NiSi金属硅化物复合材料涂层具有良好的载荷特性.
Mo2Ni3Si/NiSi wear-resistant metal silicide composite coatings were fabricated on the 1Cr18Ni9Ti austenitic stainless steel substrate by laser cladding, using Ni-Mo-Si elemental powder blends as the raw materials. The microstructures of the resulting composite coating and its worn surface morphology were analyzed by means of optical microscopy and scanning electron microscopy. The phase composition of the composite coating was examined by means of X-ray diffraction and energy dispersive spectrometry. The friction and wear behavior of the composite coating in sliding against quenched and tempered ASIS1045 steel at ambient condition was evaluated on an MM-200 friction and wear tester. Results indicated that the laser clad Mo2Ni3Si/NiSi metal silicide composite coating had fine microstructure consisting of Mo2Ni3Si primary dendrites and the interdendritic Mo2Ni3Si/NiSi eutectics. The composite coating had excellent dry sliding wear resistance which was improved with the increase of volume fraction of the primary ternary metal silicide Mo2Ni3Si. Moreover, the wear mass loss of the laser clad Mo2Ni3Si/NiSi metal silicide composite coating was much insensitive to the increase of the applied load.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2003年第3期183-187,共5页
Tribology
基金
国家自然科学基金资助项目(50071004)
北京市自然科学基金资助项目(2022012)
航空基础科学基金资助项目(O2H51007).
关键词
激光熔敷
Mo2Ni3Si
NISI
涂层
抗磨性能
金属硅化物
复合材料
Cladding (coating)
Energy dispersive spectroscopy
Intermetallics
Laser applications
Optical microscopy
Protective coatings
Scanning electron microscopy
Silicon compounds
Substrates
Tribology
Wear resistance
X ray diffraction analysis
