초록 ▼

The invention provides an improved near net-shape VPS formed multilayered combustion system component having an inner surface consisting of a smooth protective thermal barrier coating, and an outer layer of superalloy capable of withstanding temperatures in excess of 700.degree. C. The invention als

The invention provides an improved near net-shape VPS formed multilayered combustion system component having an inner surface consisting of a smooth protective thermal barrier coating, and an outer layer of superalloy capable of withstanding temperatures in excess of 700.degree. C. The invention also includes the method of forming such components by first vacuum plasma spraying a suitable mold with a ceramic top coat, followed by a bond coat and followed by a thick structural layer of superalloy. The mold is then separated from the multilayered structure which results in the desired near net-shape component. Combustor liners and transition ducts of gas turbine engines can be advantageously formed in this manner.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of near net-shape forming by vacuum plasma spray of a multi-layered combustion system component having at least an inner ceramic top coat, an intermediate metallic bond coat and an outer structural superalloy layer, which comprises:(a) providing a mold within a

[ What is claimed is:] [1.]1. A method of near net-shape forming by vacuum plasma spray of a multi-layered combustion system component having at least an inner ceramic top coat, an intermediate metallic bond coat and an outer structural superalloy layer, which comprises:(a) providing a mold within a vacuum plasma spray chamber, which mold has the shape of the inner surface of the desired component and is capable of operating at high temperatures;(b) heating said mold to a surface temperature above 400.degree. C. and vacuum plasma spraying said mold with the ceramic top coat until a desired thickness thereof is achieved;(c) then heating the so produced ceramic top coat to a surface temperature in excess of 700.degree. C. and vacuum plasma spraying thereon a thin layer of the metallic bond coat;(d) thereafter vacuum plasma spraying on the so produced bond coat, maintained at a temperature in excess of 700.degree. C., the structural superalloy layer until a predetermined thickness thereof is achieved; and(e) cooling the so produced structure and removing the mold therefrom, thereby forming the near net-shape multilayered component from inside out in a single overall operation.