Protection of carbon materials from high-temperature gas corrosion

A study is made of composite carbon-borosilicide on carbon materials prepared by gas-phase deposition, diffusion impregnation, liquid-phase impregnation, and fusion. It is shown that multilayer coatings prepared from carbon-borosilicide materials, particularly silicon and titanium carbides, and molybdenum, tungsten, and hafnium borides and silicides have greater heat resistance in the temperature range 1500-2000 degrees C in air. Their protective properties are strongly dependent on composition, coating structure, and preparation methods as well of the grade of the original carbon materials.