high purity yttria stabilized zirconia powder, thermally sprayed coating of a high purity yttria stabilized zirconia powder, thermal barrier coating for a substrate, process for producing a thermal barrier coating, thermal spray process , and, article coated with a thermal barrier coating

摘要

ZIRCENIA DUST STABILIZED WITH HIGH PURITY ITERY OR ITERBIA, THERMALLY SPRAYED COATING OF A HIGH PURITY ZYTHRANIC OR ITERBIA, THERMAL BARRIER TESTING, THERAPY PROTECTION, TESTING, TESTING , AND, ARTICLE COATED WITH A THERMAL BARRIER COATING. This invention concerns zirconia powders stabilized with high-purity yttria or iterbia comprising from about 0 to about 0.15 weight percent impurity oxides, from about 0 to about 2 weight percent oxide of hafnium (hafnia), from about 6 to about 25 weight percent of yttrium oxide (yttria) or from about 10 to about 36 weight percent of ytterium oxide (iterbia) and the oxide balance of zirconium (zirconia). Thermal barrier coatings to protect a substrate, such as blades, vanes and sealing surfaces of gas turbine engines prepared from high purity yttria or iterbia-stabilized zirconia powders have a plurality of vertical macro-cracks homogeneously dispersed in the entire coating to improve its resistance to thermal fatigue. The invention also concerns processes for producing thermal barrier coatings.