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Formation of an Environmental Barrier Coating Using DC–RF Hybrid Plasma
Author(s) -
Otsuka Akihiko,
Yamamoto Masafumi,
Itoh Takashi,
Kitagawa Kuniyuki,
Hirano Shinichi
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03426.x
Subject(s) - coating , materials science , substrate (aquarium) , plasma , chemical engineering , thermal barrier coating , composite material , oceanography , physics , quantum mechanics , engineering , geology
The characteristics of an Al 2 O 3 coating on a Nb or Mo substrate using a direct current‐radio frequency induction (DC‐RF) thermal plasma of Ar‐H 2 were studied. A porous and crystallographically stable coating with highly preferred orientation of {110} planes of α‐Al 2 O 3 crystals was obtained. The preferred orientation was strongly dependent on the diameter of the introduced Al 2 O 3 powder. The formation mechanism of the preferred orientation of the coating is explained by accumulation of charged clusters on the substrate. The coating prepared by this procedure revealed the superior capability of protecting the substrate against high‐temperature oxidation.