Study on modified C/C-Al₂O₃ functionally graded composite

The interfacial properties of C/C-Al₂O₃ functionally graded composite were modified by combining carbon fiber surface coating with matrix modification. The interfacial bond strength between reinforcement phase carbon fiber and ceramic phase Al₂O₃ was studied, the thermal performance, ablative behavior and mechanical properties were tested, and microstructure was analyzed. The results show that the matrix can be modified by adding ZrO₂. The compressive strength of C/C/Al₂O₃ composite increase by 39.1% and the 0thermal conductivity coefficient of C/C/Al₂O₃ composite decreases to 0.902 W/(m·K). And also the interfacial properties can be improved by coating carbon fiber with SiC. The strength of the composite with SiC coating reaches about 70 MPa, 3 times larger than that of composite without SiC coating.