Laser Cladding on Carbon-Carbon Composites
Final rept. 14 Dec 1998-15 Aug 2000
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
Pagination or Media Count:
This report describes the results of experiments on laser cladding a variety of protective coatings onto carbon-carbon substrates as oxidation-protection coatings. The work was performed using a 12-kW flattop CO2 laser and a powder delivery system to inject the material to be deposited into the laser beam at the surface of the sample to be coated. The laser beam is delivered by a series of optics to the substrate, where it is focused to an approximately 1.3-cm-diameter spot size. Most of the test cases used 6 kWsq cm to clad the coating material to the substrate surface. Coating materials included powdered aluminum, nickel chromium alloy, gray alumina ceramic, and a magnesium oxidezirconium oxide ceramic. Mixed results were obtained, with the alumina providing a slightly better cladding, based on visual appearance and micrographic views.
- Coatings, Colorants and Finishes
- Laminates and Composite Materials
- Fabrication Metallurgy