Yttria doped zirconia in glassy matrix useful for thermal barrier coating

摘要

Properties of thermal barrier coating (TBC) prepared from 3 wt./100 yttria doped zirconia (YDZ) dispersed in a high temperature resistant alumino-borosilicate glassy phase in the system AO-B_2O-C_2O_3-DO_2 (where A=Ca, Mg, Ba; B=na, K; C=Al; and D=Si) have been studied. The resultant coating compositions have been applied with good adherence on stainless steel (AISI-310) by simple and cost effective enameling technique. The thermal gradient of TBC with coating thickness of about 800μm has been found to be within 175-180degC when it was exposed at 1000degC for 30 min. A signficant improvement of the gradient to 650-675degC has been observed with a long exposure of coated surface at a temperature of 1000degC aided by a cooling system made of continuous flow of compressed air. Evaluation, characterization, and microstructure studies have been reported in this paper.