Chen, Chin-YiChin-YiChenTuan, Wei-HsingWei-HsingTuan2008-12-312018-06-282008-12-312018-06-28200200027820http://ntur.lib.ntu.edu.tw//handle/246246/95442https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036571864&doi=10.1111%2fj.1151-2916.2002.tb00232.x&partnerID=40&md5=390fe1cefb267ab7cd271e0b88037b60Kaolin 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.application/pdf2177089 bytesapplication/pdfen-USGrain growth; Morphology; Scanning electron microscopy; Textures; X ray diffraction analysis; Mullite textures; Kaolinconference paper10.1111/j.1151-2916.2002.tb00232.x2-s2.0-0036571864http://ntur.lib.ntu.edu.tw/bitstream/246246/95442/1/37.pdf