Effects of processing parameters on alumina coatings deposited on nickel substrates by reacting aluminum chloride and hydrogen/carbon dioxide gas mixtures

Yong W. Bae, Woo Y. Lee, Theodore M. Besmann, O. Burl Cavin, Thomas R. Watkins

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Pure nickel coupons were used as substrates in the deposition of alumina (Al2O3) from the reaction of aluminum chloride (AlCl3) with hydrogen/carbon dioxide gas mixtures in the temperature range of 954°-1100°C and system pressures of 2.7-13.3 kPa. The apparent activation energy estimated from the coating growth rate averaged 320 kJ/ mol at 13.3 kPa. At temperatures <1000°C, transition θ, κ, and δ modifications were codeposited with α-Al2O3, whereas single-phase α-Al2O3 was deposited at higher temperatures. At high AlCl3 partial pressures, nickel aluminide phases were sometimes codeposited with Al2O3, which was attributed to the reaction of AlCl3 with the nickel substrate in the presence of hydrogen gas.

Original languageEnglish
Pages (from-to)1945-1948
Number of pages4
JournalJournal of the American Ceramic Society
Volume81
Issue number7
DOIs
StatePublished - Jul 1998

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