Evolution of Mullite Texture on Firing Tape-Cast Kaolin Bodies
Resource
Journal of the American Ceramic Society 85 (5): 1121-1126
Journal
Journal of the American Ceramic Society
Journal Volume
85
Journal Issue
5
Pages
1121-1126
Date Issued
2002
Date
2002
Author(s)
Chen, Chin-Yi
Abstract
Kaolin undergoes a series of phase changes on heating to elevated temperature, proceeding through kaolin, metakaolin, γ-Al2O3 spinel, and mullite. The morphologic evolution of the kaolin-mullite reaction series was investigated in the present study. A highly textured kaolin green body was prepared by a tape-casting technique, and the morphology evolution from kaolin flakes to mullite aciculars on firing from 450° to 1600°C was then monitored using X-ray diffractometry and scanning electron microscopy. Equiaxed mullite nuclei first appeared at 1000°C; the aspect ratio of the mullite grains then increased with increased firing temperature. The mullite aciculars rearranged their orientation in a glassy phase until they impinged on each other. A highly textured mullite specimen was prepared by firing the kaolin tape at a temperature > 1500°C.
Other Subjects
Grain growth; Morphology; Scanning electron microscopy; Textures; X ray diffraction analysis; Mullite textures; Kaolin
Type
conference paper
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