Deposition and Modification of Tantalum Carbide Coatings on Graphite by Laser Interactions

Deposition and Modification of Tantalum Carbide Coatings on Graphite by Laser Interactions

Written by:

FREE
  • Publisher:
  • Publish Date: 1992
  • ISBN-10: OCLC:727316304
  • ebook-deposition-and-modification-of-tantalum-carbide-coatings-on-graphite-by-laser-interactions.pdf
DOWNLOAD NOW READ ONLINE

In order to read or download eBook, you need to create FREE account.
eBook available in PDF, ePub, MOBI and Kindle versions

Recent Activity

Book Summary

Graphite surfaces can be hardened and protected from erosion by hydrogen at high temperatures by refractory metal carbide coatings, which are usually prepared by chemical vapor deposition (CVD) or chemical vapor reaction (CVR) methods. These techniques rely on heating the substrate to a temperature where a volatile metal halide decomposes and reacts with either a hydrocarbon gas or with carbon from the substrate. For CVR techniques, deposition temperatures must be in excess of 2000[degrees]C in order to achieve favorable deposition kinetics. In an effort to lower the bulk substrate deposition temperature, the use of laser interactions with both the substrate and the metal halide deposition gas has been employed. Initial testing, involved the use of a CO[sub 2] laser to heat the surface of a graphite substrate and a KrF excimer laser to accomplish a photodecomposition of TaCl[sub 5] gas near the substrate. Results of preliminary experiments using these techniques are described.

Members Online