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Metastable Phase Relationship in the Al2O3-Cr2O3 System and Phase Equilibria of 1:1 Composition at 1200.DEG.C..
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2002
Year
EngineeringPhase EquilibriaChemistryTio2 AdditionCeramic PowdersMetastable Phase RelationshipCalcium AluminateEquilibrium Thermodynamic PropertyHigh Temperature GeochemistrySolidificationAl2o3-cr2o3 SystemMaterials ScienceInorganic ChemistryPhysical ChemistryPowder SynthesisMicrostructurePhase EquilibriumApplied PhysicsAlloy PhaseChemical Kinetics
(1) A metastable phase relationship in the Al2O3-Cr2O3 system was made by investigating the existing phases in the samples obtained by heating the coprecipitated powders for 10h in the temperature range from 1000 to 1400°C (Fig. 1). There was a metastable two-phase region of AC+CC phases below about 1330°C.(2) Equilibrium state of 1:1 composition at 1200°C was confirmed to be a single phase of the corundum solid solution.(3) TiO2 addition to the 1:1 composition was found to increase the reaction rate from the AC+CC phases into a single corundum phase at 1200°C.