Articles with enhanced temperature capabilities
A kind of product, high-temperature technology, applied in the area of thermal growth oxide, high-temperature ceramic matrix composite product and its formation field
Active Publication Date: 2021-07-06
GENERAL ELECTRIC CO
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0004] The coating systems described above can provide suitable thermal and environmental protection for articles in harsh environments, but there are opportunities to improve coating performance
Method used
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[0092] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
[0093] Some articles having a substrate, such as a ceramic matrix composite (CMC) substrate comprising silicon, may include an environmental barrier coating (EBC), such as an oxide-containing EBC, to provide thermal barrier protection and to protect the substrate from volatilization or corrosion. decline. As discussed above, a bond coat can be used between the substrate and the EBC to enhance the adhesion of the EBC to the substrate and potentially act as a sacrificial oxide layer.
[0094] The inventors have realized that when a bond coat comprising silicon is utilized between a silicon-containing substrate (e.g., a ceramic substrate) and an EBC, the bond coat can oxidize during thermal exposure to ...
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Abstract
The present disclosure provides an article (10) comprising a substrate (12), an environmental barrier coating (EBC) (16), a bond coat (14), and a boron source (20). The substrate (12) may comprise a silicon-containing ceramic material. The EBC (16) may be disposed on the substrate (12), and the bond coat (14) may be disposed between the substrate (12) and the EBC (16). The bond coat (14) may comprise silicon. The boron source (20) may be disposed within the article (10) to provide an effective amount of boron during exposure of the bond coat (14) to an oxidizing environment at a temperature greater than 900°C to form a oxides (18). The oxide (18) may be a substantially devitrification resistant borosilicate glass to avoid spalling of the EBC (16) and thereby enhance the temperature capability of the article (10).
Description
Background technique [0001] The present disclosure generally relates to high temperature articles having environmental barrier coatings and bond coatings with enhanced temperature capabilities. More specifically, the present disclosure relates to high temperature ceramic matrix composite articles having an environmental barrier coating and a bond coating configured to form and / or include an amorphous and devitrification-resistant thermally grown oxide regions. [0002] High temperature materials, such as ceramics, alloys, and intermetallics, offer attractive properties for use in structures designed to operate at high temperatures in such applications as gas turbine engines, heat exchangers, and internal combustion engines. However, the environmental characteristics of these applications often include reactive species, such as water vapor, which at high temperatures can cause significant degradation of the material structure. For example, water vapor has been shown to cause ...
Claims
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IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/00C04B41/5006F01D5/288F05D2230/90F05D2300/6033F05D2300/222F05D2300/123Y02T50/60C04B35/806C04B35/565C04B35/584C04B41/5096C04B41/4558C04B41/5035C04B41/5022C04B41/522C04B41/5024B32B18/00C04B35/58092C04B41/5058C04B41/5062C04B41/5064C23C16/045F05D2220/32
Inventor 万菊林D.M.利普金
Owner GENERAL ELECTRIC CO