Abrasive sheathing

Patent metadata

Field	Value
Publication number	US-2017044911-A1
Application number	US-201514611347-A
Country	US
Kind code	A1
Filing date	Feb 2, 2015
Priority date	May 2, 2014
Publication date	Feb 16, 2017
Grant date	—

Abstract

An abrasive sheath for application to a component surface is disclosed. The abrasive sheath may comprise a metallic layer and an abrasive layer plated on a surface of the metallic layer. The abrasive layer may include a metal matrix and abrasive particles protruding from the matrix. An exposed surface of the metallic layer of the abrasive sheath may be joinable to the component surface by a heat treatment.

First claim

What is claimed is:

1 . An abrasive sheath for attachment to a component surface, comprising:
a metallic layer; and an abrasive layer plated on a surface of the metallic layer and including a matrix and abrasive particles protruding from the matrix, an exposed surface of the metallic layer being joinable to the component surface by a heat treatment.

2 . The abrasive sheath of claim 1 , wherein the component surface is metallic.

3 . The abrasive sheath of claim 2 , wherein the abrasive particles consist of particles of cubic boron nitride.

4 . The abrasive sheath of claim 3 , wherein the matrix comprises an alloy having the formula MCrAlY, where M is selected from the group consisting of Ni, Co, Fe, and combinations thereof.

5 . The abrasive sheath of claim 4 , wherein the metallic layer consists of nickel foil.

6 . The abrasive sheath of claim 5 , wherein the heat treatment comprises welding.

7 . The abrasive sheath of claim 4 , wherein the metallic layer consists of nickel braze foil.

8 . The abrasive sheath of claim 7 , wherein the heat treatment comprises brazing.

9 . The abrasive sheath of claim 4 , wherein the component surface is a tip of a turbine blade of a gas turbine engine.

10 . The abrasive sheath of claim 4 , wherein the component surface is a cutting surface of a cutting tool.

11 . A method for attaching an abrasive sheath to a component surface, comprising:
providing the abrasive sheath, the abrasive sheath having a metallic layer and an abrasive layer plated on a surface of the metallic layer; placing an exposed surface of the metallic layer of the abrasive sheath in contact with the component surface; and attaching the abrasive sheath to the component surface by a heat treatment.

12 . The method of claim 11 , wherein the abrasive layer includes a matrix and abrasive particles protruding from the matrix.

13 . The method of claim 12 , wherein the abrasive particles comprise particles of cubic boron nitride, and wherein the matrix comprises an alloy having the formula MCrAlY, where M is selected from the group consisting of Ni, Co, Fe, and combinations thereof.

14 . The method of claim 12 , further comprising shaping the abrasive sheath to cause the abrasive sheath to conform to a shape of the component surface, prior to attaching the abrasive sheath to the component surface by the heat treatment.

15 . The method of claim 12 , wherein the metallic layer consists of nickel foil.

16 . The method of claim 15 , wherein attaching the abrasive sheath to the component surface by the heat treatment comprises welding the metallic layer to the component surface.

17 . The method of claim 12 , wherein the metallic layer consists of nickel braze foil.

18 . The method of claim 17 , wherein attaching the abrasive sheath to the component surface by the heat treatment comprises brazing the metallic layer to the component surface.

19 . A component having a surface covered with an abrasive sheath, the component being fabricated by a method comprising:
providing a metallic layer; plating an abrasive layer on a surface of the metallic layer to provide the abrasive sheath, the abrasive layer including a matrix and abrasive particles protruding from the matrix; placing an exposed surface of the metallic layer in contact with the surface of the component; and attaching the abrasive sheath to the surface of the component by a heat treatment.

20 . The component of claim 19 , wherein the abrasive particles comprise particles of cubic boron nitride, and wherein the matrix comprises an alloy having the formula MCrAlY, where M is selected from the group consisting of Ni, Co, Fe, and combinations thereof.

Assignees

• United Technologies Corp

Inventors

• Stratton Eric W
• Minor Michael J

Classifications

• F01D5/288 Primary

  Protective coatings for blades · CPC title

• B23K2201/001

  Operations & Transport · mapped topic

• B23K1/0018

  Brazing of turbine parts · CPC title

• B24D3/06

  metallic {or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements} · CPC title

• F01D5/20

  Specially-shaped blade tips to seal space between tips and stator {(F01D5/225 takes precedence)} · CPC title