セラミック基ナノ複合材料における残留応力と擬強化

概要

論文の詳細を見る
Residual stresses in Al_2O_3 and Si_3N_4-matrix nanocomposites (added with β-SiC or WC phase) have been measured by piezo-spectroscopy. The highest residual stress value was found in Al_2O_3-matrix materials. Machining procedures have been found to play a minor role in the formation of residual stresses. Analyses of both spectroscopic and strength data suggest that, when the coefficient of thermal expansion of the matrix material is much higher than that of the added dispersoid, an apparent strengthening effect may arise in nanocomposite materials. However, this effect does not arise from an actual enhancement of the inherent material toughness, since it is proved that any strength enhancement vanishes in presence of externally introduced flaws ≧30μm.
社団法人日本セラミックス協会の論文
1996-06-01