Al_2O_3/SiC粒子分散複合材料の高強度化メカニズム

概要

論文の詳細を見る
Effects of sub grain boundaries (SGB) formed in Al_2O_3 grains and residual stress caused by additions of SiC particles in Al_2O_3 phase on the strength of Al_2O_3/SiC composites were investigated. The number of the SGB and the residual tensile stress in Al2O3 were found to in crease with increasing SiC content. The experimental results suggest that the strengthening in Al_2O_3/SiC composites is attributable not only to the formation of the SGB but also to the toughness increases which is possibly related with the residual stress. The strengthening by annealing in Ar was also investigated. The all nearing resulted in the strength increase of more than 200 MPa, whereas the annealed and subsequently ground specimens did not show the strength increase. It is therefore concluded that the strengthening due to the anneal is mainly caused by healing of surface defects.
社団法人日本セラミックス協会の論文
1994-01-01