Si_3N_4-SiC复相耐磨材料的冲蚀磨损性能

Solid-Liquid Two-Phase Flow Erosion Wear Properties of Si_3N_4-SiC Composite

以Si粉和SiC为原料,采用半干法冷等静压成型,通过反应烧结成功制备了Si3N4-SiC复相耐磨材料。并将其和95Al2O3耐磨陶瓷在以水和SiC混合颗粒为冲蚀介质实验条件下,进行液固两相流冲蚀磨损对比实验。结果表明:原料中Si粉加入量为40%～80%(质量分数)试样的耐冲蚀磨损性能优于95Al2O3耐磨陶瓷。原料中Si粉加入量为70%试样的耐固液两相流冲蚀磨损性能最好,在平均线速度分别为132和67m/min的实验条件下的冲蚀率分别仅为0.87%和0.30%。此外,通过SEM观察了冲蚀后试样的显微形貌,探讨了其耐液固两相流冲蚀磨损的机理。

Si3N4-SiC composites were fabricated from the compact of Si powder and SiC formed by cold isostatic pressing via reactive sintering in nitrogen atmosphere. And contrast experiments of liquid-solid two-phase erosion-wear were taken with 95Al2O3 wear resistant ceramic using water and SiC particles as erosion medium. The results showed that erosion-wear resistance of samples with the addition of 40-80wt% Si powder was better than that of 95Al2O3 wear resistant ceramic. And the sample with the addition of 70wt% Si powder possessed an optimum liquid-solid two-phase erosion-wear property. The erosion rate were only 0.87% and 0.30% under a line speed of 132 m/min and 67 m/min, respectively.