The Properties of Fused Silica Composites

The carbon fibers and nitride silicon particles reinforced fused silica composite was fabricated using hot Pressing method. The fused silica matrix is mostly amorphous except for a little amount of tridymite precipitated. The flexural strength value of 113.7MPa, and the fracture toughness value of 1.53MPa·m ^1/2. Show the reinforced effects to be very obvious.The addition of some Si ₃N ₄particles retards the oxidation of carbon fibers and increases the burning-erosion resistance.Result of simulation carried out on the ground shows that such composite can meet the requirements for application to some spaceflight parts.