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Effects of Aluminum Concentration on the Oxidation Behaviors of Reactively Sputtered TiAlN Films
Author(s) -
Huang JowLay,
Shew BorYuan
Publication year - 1999
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.1151-2916.1999.tb01819.x
Subject(s) - oxidizing agent , aluminium , materials science , crystallite , sputtering , metallurgy , layer (electronics) , thermogravimetric analysis , substrate (aquarium) , sputter deposition , analytical chemistry (journal) , chemical engineering , thin film , composite material , chemistry , nanotechnology , oceanography , organic chemistry , chromatography , geology , engineering
Polycrystalline TiAlN films were deposited on a substrate of high‐speed steel via a radio‐frequency‐bias reactive‐sputtering process. The effects of aluminum concentration (0–60 at.%) on the high‐temperature oxidation behavior of TiAlN films were explored by using in situ thermogravimetric analysis and high‐temperature X‐ray diffractometry. The composition and distribution of the oxidizing layers over TiAlN films were investigated. Results indicated that the oxidation resistance increased as the aluminum concentration increased. The type and location of oxidizing phases also were dependent on the aluminum concentration. Three major oxides‐i.e., Al 2 O 3 , TiO 2 , and TiO‐were observed. The thickness of the Al 2 O 3 layer increased and the TiO 2 gradually changed to TiO as the aluminum content increased. Thermodynamic calculations were compared to experimental observations, and they showed good agreement.