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Cmas resistant thermal barrier coating

A thermal barrier coating and resistance technology, applied in the direction of coating, metal material coating process, plating of superimposed layers, etc., can solve the problems of metal peeling, accelerated oxidation, etc., and achieve the effect of reducing damage

Inactive Publication Date: 2007-07-25
UNITED TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Grit-related damage is caused by quicksand deposits penetrating the thermal barrier coating, which will cause any exposed metal to flake off and accelerate oxidation

Method used

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  • Cmas resistant thermal barrier coating

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Embodiment Construction

[0010] Certain coatings have been found to react with quicksand deposits and form reaction products that inhibit the penetration of quicksand into the coating. The reaction product has been determined to be a silicic acid oxyapatite / garnet consisting mainly of gadolinia, calcia, zirconia and silica. The present invention relates to a coating system for components, such as turbine engine components, which makes use of the above findings.

[0011] In accordance with the present invention, referring now to FIG. 1 , the coating system 18 of the present invention comprises alternating layers of yttria stabilized zirconia and fused silicate resistant material. To form the coating system 18, a first layer 10 of yttria-stabilized zirconia is applied to a surface 12 of a substrate 14, such as a turbine engine component including, but not limited to, a blade or bucket. Substrate 14 may be formed from any suitable material, such as nickel-based superalloys, cobalt-based alloys, molybden...

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Abstract

A turbine engine component is provided which has a substrate and a thermal barrier coating (18) applied over the substrate (14). The thermal barrier coating comprises alternating layers (10, 20, 22, 24) of yttria-stabilized zirconia and a molten silicate resistant material. The molten silicate resistant outer layer (24) may be formed from at least one oxide of a material selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, indium, zirconium, hafnium, and titanium or may be formed from a gadolinia-stabilized zirconia. If desired, a metallic bond coat may be present between the substrate and the thermal barrier coating system. A method for forming the thermal barrier coating system of the present invention is described.

Description

technical field [0001] The present invention relates to a thermal barrier coating having alternating layers of yttria stabilized zirconia and fused silicate resistant layers applicable to turbine engine components, a method of forming the coating and a Turbine engine components having the coating. Background technique [0002] Aging of turbine blades due to sand-related damage to thermal barrier coatings is a very important issue for all turbine engines used in desert environments. This type of damage requires removal of a running engine for overhaul. [0003] Grit-related damage is caused by quicksand deposits penetrating the thermal barrier coating, which will cause any exposed metal to flake off and accelerate oxidation. Contents of the invention [0004] According to the present invention, a coating system is provided that reduces grit-related damage on turbine engine components. The coating system broadly includes alternating layers of yttria stabilized zirconia an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/28F01D5/14C23C14/30C23C14/08C23C16/40C23C4/00
CPCC23C28/048F05C2253/12C04B35/50C23C28/00C23C28/345F05C2203/0886F05D2300/611C23C28/36C23C28/3215F01D5/288Y02T50/67C23C26/00C23C28/3455C23C28/042C23C28/42C23C28/321F05D2230/90F05C2203/0852F05C2201/043C04B2235/3224F05D2300/15F05D2300/211F05D2300/2285C23C4/10Y02T50/60
Inventor M·弗雷林K·W·施利奇廷M·J·马洛尼D·A·利顿J·G·斯梅吉尔D·B·斯诺
Owner UNITED TECH CORP
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