Water and oxygen corrosion resistance of SiC_f/SiC-SiYBC composites prepared by reactive melt infiltration at 1300C-1500C

In this work, the static water and oxygen corrosion behavior of SiCf/SiC-SiYBC composites was systematically studied at 1 300 degrees C to 1 500 degrees C. With the increase in corrosion temperature from 1 300 degrees C to 1 500 degrees C, both the residual strength and strength retention rate of SiCf/SiC-SiYBC composites initially increased and then decreased. The highest strength retention rate achieved was 132%, which was 35% higher than that of SiCf/SiC composites. During water and oxygen corrosion of composites, self-healing boron silicate glass and the Y2Si2O7 phase with excellent resistance to water and oxygen were generated in situ. The oxidation products are fluid at high temperatures and can fill internal pores and microcracks, thus improving the residual strength of the SiCf/SiC-SiYBC composite. The water corrosion resistance of SiCf/SiC-SiYBC materials has been confirmed to be superior to that of SiCf/SiC composites.