Hybrid part made from monolithic ceramic skin and CMC core

Patent metadata

Field	Value
Publication number	US-9505145-B2
Application number	US-201414524065-A
Country	US
Kind code	B2
Filing date	Oct 27, 2014
Priority date	Jun 30, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A hybrid part for use in a gas turbine engine has a platform and an attachment feature. The platform and an exterior portion of the attachment feature are formed from a monolithic ceramic material. A ceramic matrix composite material is located adjacent interior portions of the platform and the attachment feature and is bonded to the monolithic ceramic material.

First claim

What is claimed is:

1. A method for forming a hybrid part comprising the steps of:
casting or shaping a shell having an attachment feature with a core passage located internally of said attachment feature, said core passage extends from said attachment feature to a tip, wherein said core is exposed at said tip;
said casting or shaping step comprising forming said shell from a monolithic ceramic material powder;
densifying the shell;
drawing a ceramic matrix composite material preform through the core passage; and
bonding the ceramic matrix composite material preform to an interior wall of the monolithic ceramic material forming the shell.

2. The method of claim 1 , wherein said casting step further comprises forming said core passage as a passage which tapers from a portion adjacent a platform to said tip portion of said part.

3. The method of claim 1 , further comprising forming an airfoil portion of said part primarily from said ceramic matrix composite material.

4. The method of claim 1 , wherein said bonding step comprises using a polymer infiltration and pyrolysis technique to bond said ceramic composite material to said interior wall.

5. The method of claim 1 , wherein said bonding step comprises using a chemical vapor deposited silicon carbide ceramic matrix.

6. The method of claim 1 , wherein said bonding step comprises using a glass injected matrix.

7. The method of claim 1 , wherein said bonding step comprises using a glass infiltrated matrix.

8. The method of claim 1 , wherein said casting step comprises placing said monolithic ceramic material in powder form in a mold and densifying said monolithic ceramic material to form said shell.

9. The method of claim 1 , wherein said drawing step comprises drawing ceramic fibers coated with a polymer precursor into the core passage.

10. The method of claim 1 , wherein said ceramic matrix composite material comprises a plurality of fibers protruding from said tip and said method further comprises grinding off any protruding one of said fibers.

Assignees

• United Technologies Corp

Inventors

• Mccaffrey Michael G
• Holowczak John E

Classifications

• C04B35/806

  Chemistry & Metallurgy · mapped topic

• F05D2300/2102

  Glass · CPC title

• C04B35/803

  Chemistry & Metallurgy · mapped topic

• C04B35/584

  based on silicon nitride · CPC title

• B28B23/02 Primary

  wherein the elements are reinforcing members {(B28B23/0006 takes precedence)} · CPC title