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Annealing of Thermally Sprayed Ti 2 AlC Coatings
Author(s) -
Frodelius Jenny,
Johansson Emma M.,
Córdoba José M.,
Odén Magnus,
Eklund Per,
Hultman Lars
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02569.x
Subject(s) - materials science , max phases , annealing (glass) , intercalation (chemistry) , thermal diffusivity , thermal expansion , graphite , diffraction , metallurgy , chemical engineering , composite material , carbide , inorganic chemistry , thermodynamics , chemistry , physics , optics , engineering
Phase transformations during annealing of coatings sprayed with the high‐velocity oxy‐fuel technique using Ti 2 AlC powder have been investigated by in situ X‐ray diffraction. The as‐deposited coatings, consisting of Ti 2 AlC, Ti 3 AlC 2 , TiC, Ti–Al, and oxides, are stable up to 500°C. Ti 3 AlC 2 forms above 550°C and Ti 2 AlC forms above 700°C by intercalation of Al into TiC x . For temperatures between 900°C and 1100°C, Ti 3 AlC 2 and Ti 2 AlC decompose by losing Al to the surrounding matrix resulting in TiC x and Al 2 O 3 . The thermal expansion coefficient between ambient and 700°C is 11.9 × 10 −6 K −1 . The thermal diffusivity at room temperature is 10.5 × 10 −6 m 2 /s.