| 摘要 |
PURPOSE:To improve erosion resistance and wear characteristics in a composite material comprising Al2O3 as a matrix and SiC particles a dispersible material, by specifying particle size of SiC particles and the amount of the particles added and making a specific high density. CONSTITUTION:This wear-resistant composite material consists of 20-50vol.% SiC particles having 0.5-2.0mu average particle diameter and the rest of Al2O3 and has >=98% relative density. The composite material is obtained by blending Al2O3 powder with SiC powder and sintering the mixture. In the case, when the average particle diameter of SiC is <0.5mu, a composite material containing 50vol.% SiC can not be processed to have the above-mentioned density even by hot press, etc. and when >2.0mu, the composite material is slightly sintered in a dense state. When the content of SiC is <20vol.%, improvement in erosion resistance and wear characteristics is insufficient and when >50vol.%, a dense sintered material is not obtained. When relative density is <98%, hardness is insufficient and erosion resistance is not obtained even if SiC content is 40-50vol.%. |
