Accession Number:

ADA411861

Title:

Laser Cladding on Carbon-Carbon Composites

Descriptive Note:

Final rept. 14 Dec 1998-15 Aug 2000

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE

Personal Author(s):

Report Date:

2002-12-01

Pagination or Media Count:

45.0

Abstract:

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.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Laminates and Composite Materials
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE