Layer system

US7250222B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Knut Halberstadt · Mülheim, DE
• Werner Stamm · Mülheim an der Ruhr, DE

Key dates

• Filing date: Oct 30, 2003
• Grant date: Jul 31, 2007
• Expiry date: Jan 2, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/26
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A system for bonding layers (1) of different chemical compositions, such as bonding a thermal barrier layer to a metal substrate on a surface of a gas turbine component. A substrate (4) made either of a ceramic material or particularly of a metal super-alloy may be bonded to an outer layer (16) such as a ceramic by means of a fine-grained intermediate layer (7) bonded to the substrate (4), and a coarse-grained layer (10) bonded to the intermediate layer (7) to create a studded surface (9). The fine and coarse layers (7, 10) provide a transition between the substrate (4) and the outer layer (16) for improved bonding between them. The studded surface (9) may provide at least a 20% increase in bonding surface area for the outer layer (16). Additionally, a medium-grained layer (13) may be applied to the studded surface (9) before applying the outer layer(16).