High-Temperature Mechanical Property and Thermal Shock Resistance of Al2o3f/Al2o3 Composites

Abstract

Continuous alumina fiber-reinforced alumina matrix composites (Al2O3f/Al2O3 composites) were produced via Sol-Gel process, then the high-temperature mechanical property and thermal shock resistance of Al2O3f/Al2O3 composites were investigated. The results showed that the composites exhibited excellent high-temperature properties. The mechanical property of the composites was affected by heat treatment (prepared at 1100℃ exhibited the most desirable mechanical property), The tensile strength of the composites abruptly decreased at higher temperatures. Although the mechanical property of the composites deteriorated after the thermal shock test was conducted at high temperatures, they exhibited excellent thermal shock resistance. After 50 thermal shock tests conducted at 1300℃ and 1500°C, the flexural strength of the composites was found to be 124.34 and 93.04 MPa, thus showing a decrease in strength with increasing temperature.

Keywords: Al2O3f/Al2O3 composites, High-temperature properties, Mechanical property, Thermal shock resistance