초록 ▼

Improved adhesion of thermal barrier coatings to nonmetallic substrates using a dense layer of ceramic on an underlying nonmetallic substrate that includes at least one oxidizable component. The improved adhesion occurs because the application of the dense ceramic layer forms a diffusion barrier for

Improved adhesion of thermal barrier coatings to nonmetallic substrates using a dense layer of ceramic on an underlying nonmetallic substrate that includes at least one oxidizable component. The improved adhesion occurs because the application of the dense ceramic layer forms a diffusion barrier for oxygen. This diffusion barrier prevents the oxidizable component of the substrate from decomposing. The present invention applies ceramic by a process that deposits a relatively thick and dense ceramic layer on the underlying substrate. The formation of the dense layer of ceramic avoids the problem of void formation associated with ceramic formation by most prior art thermal decomposition processes. The formation of voids has been associated with premature spalling of thermal barrier layers and other protective layers applied to substrates.

대표청구항 ▼

1. A method for improving the adherence of thermal barrier coatings to a non-metallic substrate in an oxidizing, high temperature environment, comprising the steps of:providing a nonmetallic substrate having at least one oxidizable component; applying a dense coating of a material selected from the

1. A method for improving the adherence of thermal barrier coatings to a non-metallic substrate in an oxidizing, high temperature environment, comprising the steps of:providing a nonmetallic substrate having at least one oxidizable component; applying a dense coating of a material selected from the group consisting of silica and alumina having a low diffusivity of oxygen by a process that does not form voids to each surface of the nonmetallic substrate exposed to the oxidizing, high temperature environment; applying a thermal barrier coating to the dense coating having a low diffusivity of oxygen.