ヒル石─リン酸塩系断熱材の熱的性質

概要

論文の詳細を見る
The effect of firing operation on the thermal properties of heat insulators in the vermiculite-phosphate system was investigated by measuring their compressive strength and thermal conductivity. The aggregates used were the raw vermiculite from Fukushima Prefecture, Japan and Palaboroa area, N.E. Transvaal, S, Afica, and the bonding material of aggregates was sodium metaphosphate. Magnesium dihydrogen phosphate and aluminum dihydrogen phosphate were tried as the additives. The cimpressive strength was increased when a proper quantity of magnesium dihydorgen phosphate was added to the vermiculite-sodium metaphosphate system. This was attributed to the formation of bridge bonds due to the reactions of magnesium oxide component in vermiculite with sodium metaphosphate and magnesium dihydrogen phosphate. A considerable decrease in strength was observed when aluminum dihydrogen phosphate was added. This was explained by the X-raydiffraction evidence that alminum dihydorgen phosphate did not react with vermiculite. The thermal conductivity of the vermiculite-phosphate system was considerably smaller than that of the expanded vermiculite-bond clay-phosphate system or the expanded vermiculite-portland cement system. This corresponded to the porosity increase caused by the dehydration reaction of magnesium dihydrogen phosphate with raw vermiculite on firing.
社団法人日本材料学会の論文
1985-02-15