THERMAL-STABILITY OF PARTIALLY-YTTRIA-STABILIZED ZIRCONIA THERMAL BARRIER COATINGS DEPOSITED BY RF PLASMA-ASSISTED PHYSICAL VAPOR-DEPOSITION

The paper first summarizes the results of earlier work on the development of thermal barrier coatings produced by plasma-assisted physical vapour deposition (PAPVD). The results of burner rig trials on coatings produced by different processes are then discussed. All processes were based on electron beam PVD techniques. It was found that the most durable coating was deposited by use of two different techniques to form a coating with a thin dense layer adjacent to the substrate followed by a thicker, more open structure. In addition, the coatings were examined after failure and it was found that each different process had a separate failure mechanism. © 1990.