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Enhanced α Phase Stability During Plasma Spraying of Alumina–13 mol% Titania
Author(s) -
Venkataraman R.,
Singh Paramanand,
Krishnamurthy R.
Publication year - 2006
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.1551-2916.2005.00756.x
Subject(s) - metastability , materials science , phase (matter) , plasma , chemical engineering , evaporation , cationic polymerization , mineralogy , chemistry , thermodynamics , physics , organic chemistry , quantum mechanics , polymer chemistry , engineering
Plasma spraying of pure alumina in almost all of the normal spraying conditions results in metastable γ phase only; in contrast titania‐stabilized alumina on spraying results in stable α phase in considerable quantities along with metastable γ phase. Formation of β‐Al 2 TiO 5 and preferential evaporation of alumina leading to phase separated TiO 2 have also been observed in as‐sprayed alumina‐titania samples. Preferential stabilization of the α phase in as‐sprayed samples can be attributed to the Ti 4+ cationic substitution and formation of charge compensating defects in the α‐phased alumina lattice.