Method for protecting a hybrid ceramic structure from moisture attack in a high temperature environment

Patent metadata

Field	Value
Publication number	US-10112875-B2
Application number	US-201615087324-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Jul 22, 2008
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A method for protecting the hybrid ceramic structure from moisture attack in a high temperature combustion environment is provided. The structure includes a ceramic matrix composite (CMC) substrate (12). A thermal insulation material (14) is disposed on the substrate. A vapor resistant material (20) is applied through at least one surface of the hybrid ceramic structure while the hybrid ceramic structure is in a bisque condition that provides a degree of porosity to the hybrid ceramic structure so that the vapor resistant material is infiltrated through interstices available within a thickness of the hybrid ceramic structure.

First claim

The invention claimed is:

1. A method for protecting a hybrid ceramic structure from moisture attack in a high temperature combustion environment containing moisture, the hybrid ceramic structure comprising a ceramic matrix composite substrate and a thermal insulation material disposed on the substrate, the method comprising:
processing the hybrid ceramic structure to be in a bisque condition that provides a degree of porosity to the hybrid ceramic structure;
applying a vapor resistant material through surfaces of the thermal insulation material and the ceramic matrix composite substrate while the hybrid ceramic structure is in the bisque condition;
as a result of the degree of porosity provided by the bisque condition, infiltrating the vapor resistant material through interstices available within a thickness of the hybrid ceramic structure; and
sintering the hybrid ceramic structure to a fully sintered condition.

2. The method of claim 1 , wherein the applying of the vapor resistant material comprises applying the vapor resistant material when the hybrid ceramic structure is in a temperature range from 500° C. to 1350° C.

3. The method of claim 1 , wherein the infiltrating of the vapor resistant material comprises partially filling at least some of the interstices available within the thickness of the hybrid ceramic structure.

4. The method of claim 1 , wherein the infiltrating of the vapor resistant material comprises filling at least some of the interstices available within the thickness of the hybrid ceramic structure.

5. The method of claim 1 , wherein the infiltrating of the vapor resistant material comprises infiltrating into a binder material of the thermal insulation material where a plurality of geometric shapes is packed, the infiltrating into the binder material incrementing a densification level of a body formed by the binder material.

Assignees

• Siemens Energy Inc

Inventors

• Lane Jay E
• Merrill Gary B

Classifications

• C04B41/5042

  Zirconium oxides or zirconates; Hafnium oxides or hafnates · CPC title

• C04B41/457

  Non-superficial impregnation or infiltration of the substrate · CPC title

• Y10T428/249953

  Composite having voids in a component [e.g., porous, cellular, etc.] · CPC title

• C04B41/5045

  Rare-earth oxides · CPC title

• B32B18/00

  Layered products essentially comprising ceramics, e.g. refractory products · CPC title