Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 2, Pages 2466-2473Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.10.173
Keywords
Ultra-high temperature ceramics; Microstructure-final; Interfaces; Borides; Carbides
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Funding
- United States Air Force Contract [FA8650-15-D-5230]
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Selective laser melting of a ZrB2, ZrC, and B4C powder blend was chosen to explore the use of the additive manufacturing technology to prepare dense ceramic coatings on a metallic tungsten substrate. Laser powers between 200 and 400 W were used for the application of the ceramic coatings. Adherent coatings were fabricated; however, a thermal expansion mismatch between the coating and substrate proved to be detrimental to coating integrity after cross-sectioning. Analysis of the microstructure and composition of the resulting coatings was used to elucidate the effects of thermal gradients and the effects of tungsten and SiC impurities on the solidification of the ceramic coatings. To the authors' knowledge, these are the first ultra-high temperature ceramic coatings fabricated with a selective laser melting process.
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