Electrospark deposition process for oxidation resistant coating of cooling hole

Patent metadata

Field	Value
Publication number	US-2018009051-A1
Application number	US-201715698355-A
Country	US
Kind code	A1
Filing date	Sep 7, 2017
Priority date	Aug 14, 2012
Publication date	Jan 11, 2018
Grant date	—

Abstract

A method of providing an oxidation resistant coating is disclosed. The method includes providing a substrate having a first surface and cooling holes. A portable coating device includes electro-spark deposition (ESD) equipment and an ESD torch connected with the ESD equipment. The ESD torch has an inert gas source and a rotary electrode conductive material. The rotary electrode is positioned within the ESD torch, and is shielded by an inert gas. The rotary electrode applies a compositionally controlled protective coating to the first surface of the substrate. Then the rotary electrode is inserted into the cooling hole and generates an electrospark between rotary ESD electrode and the substrate to form a rounded edge and deposit a coating of electrode material alloy at a cooling hole edge.

First claim

What is claimed is:

1 . A turbine engine component of a metal frame substrate including cooling holes, wherein at least one of the cooling holes comprises a rounded edge with a coating adjacent a first surface, wherein the rounded edge with the oxidation resistant coating is applied using a method for providing the coating, comprising:
providing the substrate having the first surface and the at least one cooling hole; providing a portable coating device including:
electro-spark deposition (ESD) equipment, and
an ESD torch electrically connected with the ESD equipment, the ESD torch including:
an inert gas source; and
a rotary electrode including a conductive material, the rotary electrode disposed within the ESD torch, the rotary electrode shielded by an inert gas, wherein rotary electrode applies a compositionally controlled protective coating to the first surface of the substrate;
inserting the rotary electrode at least partially into the at least one cooling hole; generating an electrospark between the rotary ESD electrode and the substrate to only form the rounded edge as a result of deformation of material from the substrate at an edge of the cooling hole and deposit a coating of electrode material alloy having a thickness of 3 mils or less over the rounded edge.

Assignees

• Gen Electric

Inventors

• Lin Dechao
• Ucok Ibrahim
• Onal Kivilcim

Classifications

• F05D2230/90

  Coating; Surface treatment · CPC title

• F05D2260/202

  by film cooling · CPC title

• B23K9/04 Primary

  Welding for other purposes than joining, e.g. built-up welding · CPC title

• Y10T428/12361

  having aperture or cut · CPC title

• F01D9/023

  Transition ducts between combustor cans and first stage of the turbine in gas-turbine engines; their cooling or sealings · CPC title