HEXACELSIAN-CELSIAN PHASE TRANSFORMATION KINETICS IN POWDERED STATE

摘要

Transformation kinetics from hexacelsian to monoclinic celsian which is an attractive material as a matrix of fiber-reinforced ceramics were studied. Rate constants for nucleation and crystal growth were determined by isothermal transformation using classified powders in a particle size range of 2.0-4.0μm. Kinetic analysis was performed by a modified first order equation. Activation energies for nucleation and crystal growth were evaluated separately from the temperature dependence of the rate constants.