TiC-Al_2O_3複合材料の***ージョン摩耗特性

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Erosion wear properties of pressureless sintered TiC/Al_2O_3 composites were measured by a collision test between Al_2O_3 or SiC particles accelerated in an air stream. TiC/Al_2O_3 composites with a different TiC fraction up to 30 mass%, which had nearly theoretical density, were used as the target materials. In the case of collision by Al_2O_3 particles, the composites including 20-30 mass% TiC had an excellent wear resistance, which wear rate was 1/20 times that of Al_2O_3 monolithic ceramics. On the other hand, in the case of collision by SiC particles, the wear rate of each composite was almost the same as that of Al_2O_3 monolithic ceramic. In order to analyze the effect of the collision particles on wear rate of each composite target material, the relation between the median crack length and the Vickers indentation load was plotted in logarithmic coordinates for both TiC/Al_2O_3 composite and Al_2O_3 monolithic ceramics. The slope of TiC/Al_2O_3 composite was larger than 2/3, which was the theoretical value estimated by indentation fracture model. Since the mean fracture strength of the SiC particles determined by a diametral compression test under quasi-static loading was 2.3 times that of the Al_2O_3 particles, the mean impact force produced by the SiC particles was much larger than that of the Al_2O_3 particles. It seems that the resistance to crack propagation of TiC/Al_2O_3 composites was reduced by collision of SiC particles.
社団法人日本セラミックス協会の論文
2003-07-01

TiC-Al_2O_3複合材料の***ージョン摩耗特性

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