摘要
以Mo、Ni、Si金属粉末为原料,利用激光熔化沉积工艺制备出以难熔金属Mo初生树枝晶为增韧相,以三元金属硅化物Mo2Ni3Si为基体的金属硅化物耐磨合金,在室温干滑动磨损条件下测试了合金的耐磨性能。结果表明,初生树枝晶的体积分数随着Mo含量的增加而增加,而硬度却随之降低。由于金属硅化物Mo2Ni3Si的高硬度和难熔金属Mo树枝晶的高强韧性,合金在室温干滑动磨损条件下具有良好的耐磨性能。
The wear resistant Mo/Mo2 Ni3 Si metal silicide alloys consisting of refractory metal molybdenum primary dendrites toughening phase and interdendritic Mo2 Ni3 Si ternary metal silicide matrix were designed and fabricated by the laser melt deposition process with molybdenum, nickel and silicon elemental powder as the raw materials. Microstructures of the alloys were characterized by optical microscopy （OM）, scanning electron microscopy （SEM）, X-ray diffraction （XRD） and energy dispersive spectroscopy （EDS）. The volume fraction of molybdenum primary dendrites increases with increasing of the molybdenum atomic fraction in the raw material, while the hardness of the alloy decreases as increasing the molybdenum atomic fraction in the raw material. Wear resistance of the laser melt deposited Mo/Mo2 Ni3 Si metal silicide alloys was evaluated under dry sliding wear test conditions at room tempera- ture. The results indicate that Mo/Mo2 Ni3 Si metal silicide alloys have outstanding wear resistance because of the excellent combination of high strength and ductility of the refractory metal molybdenum primary dendrites and the high hardness and strong atomic bonds of the Mo2 Ni3 Si ternary metal silicide.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2006年第6期86-91,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金资助项目(50331010)
