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Structure and method for protecting a hybrid ceramic structure from moisture attack in a high temperature environment

  • US 9,328,028 B2
  • Filed: 07/22/2008
  • Issued: 05/03/2016
  • Est. Priority Date: 07/22/2008
  • Status: Active Grant
First Claim
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1. A hybrid ceramic structure for use in a high temperature combustion environment containing moisture, the structure comprising:

  • a ceramic matrix composite (CMC) substrate;

    a thermal insulation material disposed on the substrate,the CMC substrate and the thermal insulation material comprising respective materials susceptible to recession when subjected to temperatures of approximately 1,500°

    C. and higher in a combustion environment containing moisture and having respective subsurface cracks or fractures which are inaccessible from respective outward surfaces of the hybrid ceramic structure; and

    a coating of water vapor resistant material on respective inner surfaces of at least some of the cracks or fractures in the CMC substrate to form respective moisture-resistant layers onto the respective inner surfaces of said at least some of the cracks or fractures as the hybrid ceramic structure transitions from a bisque condition to a fully fired condition.

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