Abstract
Al8B4C7 has been synthesized and its oxidation properties have been evaluated in both powder and sintered state. Al8B4C7 can be synthesized at above 1250°C by using Al+B4C+C as a starting material mixture. At 1800°C, no other phase could be identified. The process is achieved via gas phase. In the temperature range 700-1000°C, the results show that oxidation occurred by a parabolic kinetic process, the activation energy of the process is 25.8kJ/mol, indicating that Al8B4C7 powder is liable to oxidation. A sintered pure Al8B4C7 body cannot be satisfactorily used in air at temperatures higher than 1200°C because of its low oxidation resistance.
