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Journal of Materials Engineering and Performance

, Volume 28, Issue 1, pp 557–566 | Cite as

Fabrication, Analysis of Microstructure and Oxidation Resistance of Cemented C/C Composites by Laser

  • Jorge A. Ramos-GrezEmail author
  • David L. Bourell
  • Madhavrao Govindaraju
Article
  • 25 Downloads

Abstract

Cylindrical carbon–carbon composites have been cemented using a CO2 laser actuated by a raster scanning mirror system in a four-step sequence. Complete and homogenous surface cementation as well as thermal stability of the composites was sought after and achieved. The line of heat created from the laser beam impinged parallel to the axis of the pre-coated cylinder, while suspended from one end and slowly rotated. Four slurry compositions, all containing chloride salts from refractory elements, some combined with silicon, were pre-deposited by air spraying it over each specimen and then laser treated sequentially. Confined heat sublimed the chlorine ions resulting in silicide compounds that reacted with the carbon substrate to form a bonding layer. Microstructure characterization was performed using scanning electron microscopy, energy-dispersive spectroscopy and x-ray diffraction, immediately after the cementation was consolidated and after heat treated under argon. Preliminary oxidation weight loss tests were performed up to 1423 K under argon and air, revealing a 9.8 and 30.6% weight reduction, respectively, after 9 h of exposure. Cemented specimens were then coated with a glass overcoat layer that allowed them to perform moderately better against oxidation achieving up to a 28% weight loss after 20 h at 1273 K in air.

Keywords

3D cylindrical C/C composites cementation laser processing refractory coatings 

Notes

Acknowledgments

The authors would like to acknowledge the University of Texas at Austin, SBIR Phase II Seed Fund, BMDO program, Wright Patterson Air Force Research Laboratory and the University of Texas at San Antonio. The corresponding author advanced this manuscript during his stay at the University of Notre Dame Aerospace and Mechanical Engineering Department in South Bend, Indiana, USA.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Jorge A. Ramos-Grez
    • 1
    Email author
  • David L. Bourell
    • 2
  • Madhavrao Govindaraju
    • 3
  1. 1.Mechanical and Metallurgical Engineering DepartmentPontificia Universiad Católica de ChileMaculChile
  2. 2.Mechanical Engineering DepartmentUniversity of Texas at AustinAustinUSA
  3. 3.Mechanical Engineering DepartmentUniversity of Texas at San AntonioSan AntonioUSA

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