High temperature characterization of LPS-SiC based materials with oxide additives

Abstract This paper dealt with the microstructure and the flexural strength of monolithic SiC and SiC f /SiC composite materials. Especially, the mechanical property of SiC based materials were investigated at the elevated temperatures of 1000 and 1200 °C in the argon atmosphere. The microstructural variation of SiC based materials by the thermal exposure at the bending test temperature was also analyzed. SiC based materials were fabricated by a liquid phase sintering process (LPS), using an additive materials of Al 2 O 3 and Y 2 O 3 . A two-dimensional weave of Tyranno SA fibers were utilized as a reinforcing material for SiC f /SiC composite. SiC based materials was sintered at the temperature of 1820 °C for the creation of secondary phases. LPS-SiC materials represented a good density of about 3.1 Mg/m 3 and an average flexural strength of about 750 MPa at the room temperature. The sintering density of LPS-SiC f /SiC was also similar to that of LPS-SiC materials. However, the flexural strength of LPS-SiC based materials greatly decreased with the increase of test temperature.