Multilayer coating with self-sealing properties for carbon-carbon composites

摘要

This work proposes a simple and low cost method to deposit an effective multilayer protective coating on carbon-carbon composites (C/C). The first layer is made of molybdenum disilicide particles in a barium boron aluminosilicate glass (SABB); the second (external) layer is made of yttrium oxide modified SABB. A study of the reactions between the yttrium oxide and the SABB glass is presented. The coated C/C were submitted to thermal cycling or thermal aging tests up to 1300 deg C in air. Weight losses were less than 0.5 percent in 50 h of thermal cycling and less then l percent in 150 h of thermal aging.