Sintering and Mechanical Properties of Stoichiometric Mullite

Abstract

Stoichiometric mullite powder (3Al 2 O 3 ·2SiO 2 ) prepared by spray pyrolysis and sintered at 1650°C attained 95% of theoretical density. The flexural strength was 360 MPa at room temperature and decreased slightly at 1400°C. A fairly high K Ic value (2.8 MN/m 3/2 ) was obtained. These mechanical properties can be attributed to the highly homogeneous stoichiometric composition of the raw powder.