乾式摩砕法によるカオリンからのムライトの合成

概要

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Preparation of mullite from a mixture of kaolin and gibbsite by dry-grinding has been investigated by XRD, DTA and SEM. The structure of the mixture transformed to an amorphous structure by dry grinding for 240h and the spherical particles 0.2-0.3μm diameter were obtained. The mixture ground for 240h formed the spinel phase and mullite after firing at 950℃. It was therefore considered the dry-grinding was effective to promote the formation of mullite. The activation energy for the mullite formation from 240h ground specimen decreased to 544 kJ/mol from 1047 kJ/mol in no grinding specimen. The lattice parameters of mullite formed from the specimens ground various time and fired at 1500℃ for I h were similar values with those of mullite with 3Al_2O_3・2SiO_2 composition.
社団法人日本セラミックス協会の論文
1990-07-01