Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Functionally Graded Material Thermal Barrier Coating Systems for Gas Turbine Components Grown by Electron Beam Physical Vapor Deposition

IP.com Disclosure Number: IPCOM000198728D
Original Publication Date: 2010-Aug-23
Included in the Prior Art Database: 2010-Aug-23
Document File: 1 page(s) / 294K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Ceramic Thermal Barrier Coatings (TBC) are widely used in land-based and jet-engine gas turbines. The ceramic TBC does not adhere strong enough directly to the Ni- and Co-based superalloy surface (Ni: Nickel; Co: Cobalt). Usually an additional metallic layer, the bond-coat, is added between the superalloy and the TBC. The different thermal expansion coefficients of the ceramic and the metal lead to thermal stresses during service and eventually spall of the TBC occurs.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 69% of the total text.

Page 1 of 1

Functionally Graded Material Thermal Barrier Coating Systems for Gas Turbine y Electron Beam Physical Vapor Deposition

Components Grown b

Idea: Dr. Kai Kadau, DE-Mülheim

Ceramic Thermal Barrier Coatings (TBC) are widely used in land-based and jet- The ceramic TBC does not adhere strong enough directly to the
(Ni: Nickel; Co: Cobalt). Usually an additional metallic layer, the bond-coat, is added superalloy and the TBC. The different thermal expansion coefficients of the ceramic lead to thermal stresses during service and eventually spall of the TBC occurs.

In order to reduce the thermal stresses an application of a Functionally Graded Ma
system is suggested that ensures a smooth transition between the bond coat material and the (see Figure 1). Furthermore, as there is no sharp interface between the bond coat a probability of crack formation will be reduced. To produce such FGM coating sy
components (such as blades and vanes), an Electron Beam Physical Vapor Depo suggested. Evaporation of a gradually changing concentration from pure bond co
ceramic TBC material can be achieved by a rotating ingot plate with radial varying a materials. The homogeneity of the coating system

and an adjustment of their concentrations by having appropriate structures on the rotating plat multiple single species ingots that are movable (or adjustable electron beam). In
an EB-PVD with only two evaporation electro

engine gas turbines.

Ni- and Co-based superalloy surface
between the

and the met...