Optimization on Influencing Factors of Fracture Toughness of Corundum-mullite Toughened by In-situ Synthesized Mullite Whiskers by Response Surface Methodology

摘要

The corundum-mullite was toughened by in-situ synthesized mullite whiskers and the process parameters influencing the fracture toughness of corundum-mullite, such as sintering temperature, addition amount of AlF_3 and V_2O_5, were optimized by means of response surface method. Corundum-mullite with fracture toughness of 9.44 Mpa·m~(-1/2) could be obtained under the optimized conditions, i.e. sintering temperature of 1400°C, 4.8 wt.% of AlF_3 and 5.8 wt.% of V_2O_5. The results showed that it was feasible to prepare corundum-mullite toughened by in-situ synthesized mullite whiskers by the optimized parameters. In addition, an accurate model based on response surface method was proposed to predict the experimental results.