摘要:
A thermal spray process for producing a MCrAlY-based coating wherein M is selected from the group consisting of iron, cobalt, nickel and mixtures thereof and wherein the carbon in the fuel of the thermal spray process converts between 30 to 80 percent by weight of the chromium component in the coating to chromium carbide.
摘要:
A thermal spray process for producing a MCrAlY-based coating wherein M is selected from the group consisting of iron, cobalt, nickel and mixtures thereof and wherein the oxygen in the fuel-oxidant mixture of the thermal spray process converts a substantial portion of the yttrium component to Y.sub.2 O.sub.3, a minor portion of the aluminum component to Al.sub.2 O.sub.3, and the Y.sub.2 O.sub.3 and Al.sub.2 O.sub.3 are present in an amount of less than 15 volume percent of the coating.
摘要:
This invention relates to thermally sprayed coatings of a high purity yttria or ytterbia stabilized zirconia powder, said high purity yttria or ytterbia stabilized zirconia powder comprising from about 0 to about 0.15 weight percent impurity oxides, from about 0 to about 2 weight percent hafnium oxide (hafnia), from about 6 to about 25 weight percent yttrium oxide (yttria) or from about 10 to about 36 weight percent ytterbium oxide (ytterbia), and the balance zirconium oxide (zirconia). Thermal barrier coatings for protecting a component such as blades, vanes and seal surfaces of gas turbine engines, made from the high purity yttria or ytterbia stabilized zirconia powders, have a density greater than 88% of the theoretical density with a plurality of vertical macrocracks homogeneously dispersed throughout the coating to improve its thermal fatigue resistance.
摘要:
This invention relates to high purity yttria or ytterbia stabilized zirconia powders comprising from about 0 to about 0.15 weight percent impurity oxides, from about 0 to about 2 weight percent hafnium oxide (hafnia), from about 6 to about 25 weight percent yttrium oxide (yttria) or from about 10 to about 36 weight percent ytterbium oxide (ytterbia), and the balance zirconium oxide (zirconia). Thermal barrier coatings for protecting a component such as blades, vanes and seal surfaces of gas turbine engines, made from the high purity yttria or ytterbia stabilized zirconia powders, have a density greater than 88% of the theoretical density with a plurality of vertical macrocracks homogeneously dispersed throughout the coating to improve its thermal fatigue resistance.
摘要:
A thermally sprayed coating, coating system and coated article are disclosed. The disclosed embodiments of the thermally sprayed coating, coating system and coated article use a customized ceramic powder comprising ceramic powder particles having an average particle size of about 25 to about 75 microns. In particular, the ceramic powder particles contain from about 70 to about 95 percent by weight of a zirconia-based component, with the balance being an (alumina+silica)-based component and wherein said ceramic powder particles comprise micronized sub-particles of the zirconia-based component and the (alumina+silica)-based component.
摘要:
This invention relates to articles coated with a thermally sprayed coating of a high purity yttria or ytterbia stabilized zirconia powder, said high purity yttria or ytterbia stabilized zirconia powder comprising from about 0 to about 0.15 weight percent impurity oxides, from about 0 to about 2 weight percent hafnium oxide (hafnia), from about 6 to about 25 weight percent yttrium oxide (yttria) or from about 10 to about 36 weight percent ytterbium oxide (ytterbia), and the balance zirconium oxide (zirconia). The articles include, for example, blades, vanes and seal surfaces of gas turbine engines coated with a thermal barrier coating.
摘要:
This invention relates in part to thermal barrier coating systems that comprise at least one metallic or metallic/ceramic inner layer deposited onto a substrate, at least one ceramic intermediate layer deposited onto the inner layer, and at least one ceramic outer layer deposited onto the intermediate layer. The ceramic intermediate layer is a thermally sprayed coating having a plurality of macrocracks distributed throughout the intermediate layer. The ceramic outer layer is a thermally sprayed coating made from composite ceramic powder particles that include a zirconia-based component and an (alumina+silica)-based component. The ceramic outer layer is substantially free of macrocracks. This invention also relates in part to methods of forming thermal barrier coating systems, and articles coated with thermal barrier coating systems. The thermal barrier coating systems are suitable for protecting components exposed to high temperature environments, such as the thermal environment of a gas turbine engine.
摘要:
A compressor or turbine blade having its tip coated with a zirconium-based oxide having a plurality of macrocracks extending at least 100 microns through the coating and the process used to produce such a coating.
摘要:
A thermally sprayed coating, coating system and coated article are disclosed. The disclosed embodiments of the thermally sprayed coating, coating system and coated article use a customized ceramic powder comprising ceramic powder particles having an average particle size of about 25 to about 75 microns. In particular, the ceramic powder particles contain from about 70 to about 95 percent by weight of a zirconia-based component, with the balance being an (alumina+silica)-based component and wherein said ceramic powder particles comprise micronized sub-particles of the zirconia-based component and the (alumina+silica)-based component.
摘要:
This invention relates to ceramic powders comprising a zirconia-based component, e.g., yttria-stabilized zirconia, and an (alumina+silica)-based component, e.g., mullite. The ceramic powders are useful for forming thermal shock resistant coatings having the same composition, through deposition by thermal spray devices. This invention also relates to thermal barrier coating systems suitable for protecting components exposed to high temperature environments, such as the thermal environment of a gas turbine engine. This invention further relates to forming free-standing solid ceramic articles.