Composite blade with an integral blade tip shroud and method of forming the same

Patent metadata

Field	Value
Publication number	US-9845688-B2
Application number	US-201314138627-A
Country	US
Kind code	B2
Filing date	Dec 23, 2013
Priority date	Mar 15, 2013
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A gas turbine engine airflow member including a blade core portion, a shroud tip portion extending from the blade core portion, and an airfoil portion formed exteriorly to the blade core portion, where the blade core portion and the shroud tip portion are constructed as a first unitary structure and the airfoil portion is constructed as a second structure. A method of forming a gas turbine engine component is also disclosed.

First claim

What is claimed is:

1. A gas turbine engine airflow member, comprising:
a blade core portion;
a shroud tip portion extending from the blade core portion;
an airfoil portion formed exteriorly to and surrounding the blade core portion and terminating at the shroud tip portion forming a shroud interface at a lateral portion of the shroud tip portion; and
wherein the blade core portion and the shroud tip portion are constructed as a first unitary structure and the airfoil portion is constructed as a second structure,
wherein the first unitary structure is formed of a single-piece monolithic material and the second structure is formed of a composite material having a plurality of fiber plies with a two dimensional orientation,
wherein the single-piece monolithic material comprises a first composite material and wherein the second structure comprises a second composite material, and
wherein the first composite material includes a first plurality of fiber plies having a three dimensional orientation, and wherein the second composite material includes a second plurality of fiber plies having a two dimensional orientation,
further including a sealing knife portion extending from the shroud tip portion opposite the shroud interface.

2. The gas turbine engine airflow member of claim 1 , wherein the blade core portion and the shroud tip portion form the single-piece monolithic structure.

3. The gas turbine engine airflow member of claim 1 , wherein the first composite material and the second composite material are subjected to a singular infiltration process with a common matrix material.

4. The gas turbine engine airflow member of claim 3 , wherein the common matrix material includes a ceramic material.

5. A gas turbine engine turbomachinery component, comprising:
a plurality of airflow members structured to direct a flow stream through the turbomachinery component, each of the plurality of airflow members including:
a blade core portion and a shroud tip portion integral with one another to define a first single-piece unitary structure; and
an airfoil portion defining a second structure formed external to and surrounding the blade core portion and terminating at a lateral portion of the shroud tip portion, and
wherein the first single-piece unitary structure comprises a first composite material construction comprising a first plurality of fiber plies.

6. The gas turbine engine turbomachinery component of claim 5 , wherein the first composite material construction comprises a ceramic matrix composite.

7. The gas turbine engine turbomachinery component of claim 5 , wherein the first composite material construction comprises a first plurality of fiber plies with a two dimensional architecture.

8. The gas turbine engine turbomachinery component of claim 5 , wherein the first composite material construction comprises a first plurality of fiber plies with a three dimensional architecture.

9. The gas turbine engine turbomachinery component of claim 8 , wherein the second structure comprises a second composite material construction including a second plurality of fiber plies.

10. The gas turbine engine turbomachinery component of claim 9 , wherein the second plurality of fiber plies includes a two dimensional architecture.

11. A method, comprising:
forming a single-piece unitary construction of a gas turbine engine component including
a blade core portion and an integral shroud tip portion; and

laying up at least one ply of a second construction to form an airfoil portion external to and surrounding the blade core portion and terminating at a lateral portion of the shroud tip portion, and
wherein said forming further includes constructing a first fiber reinforced composite having a first plurality of fiber plies with a three dimensional architecture.

12. The method of claim 11 , wherein said laying up further includes constructing a second fiber reinforced composite having a second plurality of fiber plies with a two dimensional architecture.

13. The method of claim 11 , further including infiltrating the single-piece unitary construction and the second construction with a common matrix material.

Assignees

• Rolls Royce Corp
• Rolls Royce Nam Tech Inc
• Rolls Royce Nam Tech Inc

Inventors

• Thomas David J
• Freeman Ted J
• Uskert Richard C
• Junod Larry A
• Lamusga Joseph

Classifications

• F01D5/282

  Selecting composite materials, e.g. blades with reinforcing filaments · CPC title

• Y10T29/49321

  Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member · CPC title

• F05D2300/6033

  Ceramic matrix composites [CMC] · CPC title

• F01D5/284

  Selection of ceramic materials · CPC title

• F01D5/225 Primary

  by shrouding · CPC title