Erosion resistant coatings and methods thereof

US7141110B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Dennis Michael Gray · Delanson, US
• Krishnamurthy Anand · Bengaluru, IN
• Warren Arthur Nelson · Schenectady, US
• Hans Aunemo · Oslo, NO
• Alain Demers · Suncook, US
• Olav Rommetveit · Sarpsborg, NO

Key dates

• Filing date: Dec 31, 2003
• Grant date: Nov 28, 2006
• Expiry date: Aug 20, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/263
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Erosion resistant coating processes and material improvements for line-of-sight applications. The erosion resistant coating composition includes nanostructured grains of tungsten carbide (WC) and/or submicron sized grains of WC embedded into a cobalt chromium (CoCr) binder matrix. A high velocity air fuel thermal spray process (HVAF) is used to create thick coatings in excess of about 500 microns with high percentages of primary carbide for longer life better erosion resistant coatings. These materials and processes are especially suited for hydroelectric turbine components.