Evolution of microstructure and mechanical properties in laser induced reaction coating of Al(sub 2)O(sub 3) on SiC/Al(sub 2)O(sub 3) composite

摘要

Protection of a SiC(p)/Al2O3 composite (SiC particulate-reinforced Al(sub 2)O(sub 3)-matrix) at high temperature from deleterious reactions occurring within and with the surrounding environment is required for high temperature applications. Development of a continuous Al2O3 coating on SiC(p)/Al2O3 ceramic composite for such protection is achieved using the laser assisted in-situ reaction technique. The as-deposited alumina coating was analyzed using optical microscopy and XRD. The coated samples were also evaluated for mechanical properties using 3-point bend tests.