Highly textured mullite was obtained by enhancing anisotropic grain growth by TiO 2 doping and by templating grain growth on oriented acicular mullite seed particles in a mullite precursor. Upon heating, the mullite precursor crystallized and densified to an equiaxed microstructure of 1‐2 µm mullite grains at which time the mullite seed particles grew rapidly in the length direction ( c ‐axis) to produce a highly textured microstructure. By changing the seed (template) particle concentration, a range of oriented microstructures and anisotropic grains could be produced.
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Hong et al. (1999) studied this question.
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