Effect of Al2O3 and Cu on the microstructure and oxidation properties of Mo5Si3 composite

摘要

Al2O3/Mo5Si3 and Al2O3/Mo5Si3-Cu composites were successfully synthesized via a ball-milled mixture of MoO3, Mo, Si and Al powders and consolidated by hot pressing. The microstructure and oxidation properties of the composites were investigated. Results show that Al2O3/Mo5Si3 and Al2O3/Mo5Si3-Cu composite powders were obtained after 10 h of milling. At 600 degrees C, the addition of Al2O and Cu in the Mo5Si3 could effectively restrain its pest oxidation. At 1200 degrees C, the corresponding oxidation rate constants of the composites are almost an order of magnitude lower than the Mo5Si3 alloy. The composites have better oxidation resistance than the Mo5Si3 alloy. (C)5 Elsevier Ltd. All rights reserved.