摘要:
A protective coating for a component comprising a ceramic based substrate, and methods for protecting the component, the protective coating adapted for withstanding repeated thermal cycling. The substrate may comprise silicon nitride or silicon carbide, and the protective coating may comprise at least one tantalate of scandium, yttrium, or a rare earth element. The protective coating may further comprise one or more metal oxides. The coating protects the substrate from combustion gases in the high temperature turbine engine environment. The coating may be multi-layered and exhibits strong bonding to Si-based substrate materials and composites.
摘要:
A component comprising a silicon-based substrate and a diffusion barrier coating disposed on the silicon-based substrate. The diffusion barrier coating comprises an isolation layer disposed directly on the silicon-based substrate and at least one oxygen barrier layer disposed on the isolation layer. The oxygen barrier layer prevents the diffusion of oxygen therethrough, and prevents excessive oxidation of the silicon-based substrate. The isolation layer(s) prevent contaminants and impurities from reacting with the oxygen barrier layer. An environmental barrier coating may be disposed on the diffusion barrier coating, and a thermal barrier coating may be disposed on the environmental barrier coating. Methods for making a component having a diffusion barrier coating are also disclosed.
摘要:
An environmentally and thermally protected component comprising a silicon-based ceramic or composite substrate and an environmental and thermal barrier coating disposed on the substrate. The environmental and thermal barrier coating comprises at least about 50 mole % AlTaO4. The composition of the environmental and thermal barrier coating may be adapted to provide excellent CTE (coefficient of thermal expansion) match with a substrate, such as a SiC-based ceramic or composite. Coating compositions of the invention have a stable crystalline structure at a temperature up to at least about 1550° C. Methods for preparing an environmentally and thermally protected component are also disclosed.
摘要翻译:环境和热保护的组分,其包含硅基陶瓷或复合衬底以及设置在衬底上的环境和热障涂层。 环境和隔热涂层包含至少约50摩尔%的Al Ta O 4。 环境和隔热涂层的组成可以适于提供优异的CTE(热膨胀系数)与诸如SiC基陶瓷或复合材料的基底匹配。 本发明的涂料组合物在高达至少约1550℃的温度下具有稳定的晶体结构。还公开了制备环境和热保护组分的方法。
摘要:
A protective barrier coating system including a diffusion barrier coating and an oxidation barrier coating and method for use in protecting silicon-based ceramic turbine engine components. A complete barrier coating system includes a thermal barrier coating of stabilized zirconia and an environmental barrier coating of an alloyed tantalum oxide. The oxidation barrier coating includes a layer of metallic silicates formed on a substrate of silicon nitride or silicon carbide to be protected. The oxidation barrier coating can include silicates of scandium, ytterbia or yttrium. The oxidation barrier coating may also include an inner layer of Si2ON2 between the diffusion barrier and the metallic silicate layer. The oxidation barrier coating can be applied to the substrate by spraying, slurry dipping and sintering, by a sol-gel process followed by sintering, by plasma spray, or by electron beam-physical vapor deposition. The diffusion layer of essentially pure Si3N4 can be applied to the substrate to prevent the migration of damaging cations from the protective layers to the substrate and is preferably formed by chemical vapor deposition. A method for protecting silicon based substrates can comprise a step of forming an oxidation barrier coating on a substrate, where a step of forming the oxidation barrier includes a step of sintering the oxidation barrier and substrate in a wet gas containing hydrogen.
摘要翻译:一种包括扩散阻挡涂层和氧化屏障涂层的保护性屏障涂层系统以及用于保护硅基陶瓷涡轮发动机部件的方法。 完整的阻隔涂层系统包括稳定的氧化锆的隔热涂层和合金化氧化钽的环境屏障涂层。 氧化阻挡涂层包括在待保护的氮化硅或碳化硅的衬底上形成的金属硅酸盐层。 氧化屏障涂层可以包括钪,镱或钇的硅酸盐。 氧化阻隔涂层还可以包括扩散阻挡层和金属硅酸盐层之间的Si 2 2 2 N 2的内层。 通过喷雾,浆料浸渍和烧结,通过溶胶 - 凝胶法烧结,通过等离子体喷涂,或通过电子束 - 物理气相沉积,可将氧化阻隔涂层施加到基材上。 可以将基本上纯的Si 3 N 4 N 4的扩散层施加到基底上,以防止损伤的阳离子从保护层迁移到基底,并且优选地由化学 气相沉积。 用于保护硅基基板的方法可以包括在基板上形成氧化阻挡涂层的步骤,其中形成氧化屏障的步骤包括在含氢的湿气中烧结氧化阻挡层和基板的步骤。
摘要:
A component comprising a silicon-based substrate and a braze-based protective coating disposed on the silicon-based substrate. The braze-based coating comprises a brazed layer, wherein the brazed layer comprises at least one intermetallic compound. A scale layer may be formed on the brazed layer. An environmental barrier coating may be disposed directly on the brazed layer or directly on the scale layer. A thermal barrier coating may be disposed on the environmental barrier coating. Methods for making a Si-based component having a braze-based protective coating are also disclosed.
摘要:
A turbine engine component includes an electron beam-physical vapor deposition thermal barrier coating covering at least a portion of a substrate. The thermal barrier coating includes an inner layer having a columnar-grained microstructure with inter-columnar gap porosity. The inner layer includes a stabilized ceramic material. The thermal barrier coating also includes a substantially non-porous outer layer, covering the inner layer and including the stabilized ceramic material. The outer layer is deposited with continuous line-of-sight exposure to the vapor source under oxygen deficient conditions. The outer layer may further comprise a dopant oxide that is more readily reducible than the stabilized ceramic material. During deposition, the outer layer may also have an oxygen deficient stoichiometry with respect to the inner layer. Oxygen stoichiometry in the outer layer may be restored by exposure of the coated component to an oxidizing environment.
摘要:
A component for a turbine engine component includes a ceramic substrate having a surface, an environmental barrier layer bonded to the substrate surface, and an impact-resistance layer bonded to the environmental barrier layer, the impact-resistance layer having a melting point higher than about 2700° F., and further having a between about 10 and about 30% porosity. The impact-resistance layer, environmental barrier layer, and interfaces at which the environmental layer is bound to the substrate surface and the impact-resistance layer are more readily shearable than the substrate. A method for protecting a turbine engine component from environmental and particle impact-related damage includes the steps of coating a substrate surface with the environmental barrier layer, and coating the environmental barrier layer with the impact-resistance layer.
摘要:
A durable protective coating may be formed by applying a thin layer of metastable alumina to a bond coating on a substrate. A thermal barrier coating may then be applied to the metastable alumina and the resulting part may be heat treated to transform the metastable alumina to a mixed alpha alumina having particles of the thermal barrier coating, such as zirconia in the case of an yttria stabilized zirconia thermal barrier coating, dispersed therein. The resulting thermal barrier coating may inhibit microbuckling of the thermally grown oxide scale that grows over time at the thermal barrier coating-bond coating interface.
摘要:
A turbine engine component includes an electron beam-physical vapor deposition thermal barrier coating covering at least a portion of a substrate. The thermal barrier coating includes an inner layer having a columnar-grained microstructure with inter-columnar gap porosity. The inner layer includes a stabilized ceramic material. The thermal barrier coating also includes a substantially non-porous outer layer, covering the inner layer and including the stabilized ceramic material. The outer layer is deposited with continuous line-of-sight exposure to the vapor source under oxygen deficient conditions. The outer layer may further comprise a dopant oxide that is more readily reducible than the stabilized ceramic material. During deposition, the outer layer may also have an oxygen deficient stoichiometry with respect to the inner layer. Oxygen stoichiometry in the outer layer may be restored by exposure of the coated component to an oxidizing environment.
摘要:
Platinum containing coatings for corrosion and oxidation protection of a substrate, and platinum electrodeposition methods for coating a substrate. The coating may comprise platinum and at least one supplementary constituent, and the method may involve co-electrodeposition of platinum and the supplementary constituent from a single electrolyte composition. The supplementary constituent may comprise chromium, an oxidation protective reactive element, or an alloy of chromium with a reactive element. Components protected by such coatings are also disclosed.