Study On Thermal Shock Resistance Simulation Of Nanocomposite Ceramic Tool Materials

Toughening-strengthening mechanisms and thermal shock resistance of nanocomposite ceramic tool materials were investigated as the main content of this thesis, which are of great importance for the design and development of nanocompsite ceramic tool materials with high toughening and strengthening as well as high thermal shock resistance.The theoretical model for studying the micro residual thermal stresses in nanocomposite ceramic tool material was established, by which the values and the distribution of residual thermal stresses induced by the nano inclusions were obtained. The effect of plasticity deformation on residual thermal stress was investigated. The residual thermal stresses in the intra and the inter granular of nanocompsite ceramic tool materials were analyzed .The toughening and strengthening mechanisms of nanocompsite ceramic tool materials were thoroughly researched. The contributions of several toughening and strengthening mechanisms were analyzed. The optimal content and critical size formulas of nano granule were educed. The relation between nanocompsite ceramic strength and residual thermal stresses was established. The thesis had finished the qualitative analyse of nanocompsite ceramic tool thermal shock resistance, by Al₂O₃-based nanocompsite ceramic tool thermal thock simulation test.