Abstract
Densification and anisotropic grain growth were investigated in sol-gel derived, boria-doped diphasic mullite. Boria enhanced viscous flow densification by reducing the viscosity and also produced a fine grain microstructure. Whisker-like mullite grains evolved from the dense, equiaxed microstructure. The onset temperature was ∼1500°C. Chemical leaching was employed to characterize the anisotropic grains. Growth kinetics showed that anisotropic grains followed the empirical equation G n-G o n=Kt with n=3 and n=4 for the length and thickness directions, respectively. The activation energies for grain growth were 660 kJ mol −1 for elongation and 800 kJ mol −1 for thickening.
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