High performance SiC/SiOC composites with in situ carbon interface

A novel SiC/SiOC composite was prepared via the polymer infiltration and pyrolysis (PIP) process by using a low-cost poly-methyl-silsesquioxane resin as matrix precursor and continuous thin SiC fibers as reinforcements. A carbon coating is in situ formed on SiC fiber prior to the composite processing. The high yield of the resin resulted in a short period of the composites achieving densification. The composites exhibited pseudoplastic fracture with a high flexural strength of 315.10 MPa and a fracture toughness of 21.6 MPa m1/2. With the help of the in situ coating, the SiC fibers pulled out of the matrix independently, leading to optimization of the rein-forcing effect and enhancement of the composite strength compared to chemical vapor deposition (CVD) fiber coatings. After annealing in N2 at 1000 degrees C for 10 h, the strength retention rate of the composites is 92.21%, showing excellent stability to be used in thermal structural components.

Automated summary

A novel SiC/SiOC composite with a carbon coating on SiC fibers was prepared through the polymer infiltration and pyrolysis (PIP) process using a low-cost poly-methyl-silsesquioxane resin as the matrix precursor. The composites exhibited pseudoplastic fracture with a high flexural strength of 315.10 MPa and a fracture toughness of 21.6 MPa m1/2. The in situ coating allowed the SiC fibers to be pulled out of the matrix independently, optimizing the reinforcing effect and enhancing the composite strength compared to chemical vapor deposition (CVD) fiber coatings. After annealing in N2 at 1000 degrees C for 10 h, the composites showed excellent stability with a strength retention rate of 92.21%, making them suitable for thermal structural components.