火山ガラスの風化による変化と加熱発泡性について

概要

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The weathering process of obsidian occured at Imari district in Saga prefecture was studied on the basis of the data for X-ray powder diffraction analysis, differential thermal analysis and microscopic observation. The samples collected at different weathering degree were examined to obtain a good raw material for bloating by heat treatment using small scaled rotary kiln. To discuss the relationship between glass structure and the bloating properties, the structures of the glass were analysed by using the method of radial distribution function. The following results were summarized. (1) In proportion to the increase of the weathering degree, a lump of the obsidian was weathered into many needle like glass paritcles, and then those particles were also weathered into some spherical glass particles. (2) The expanding ratio of weathered glass particles becomes higher than those of fresh ones. (3) Long range order of the glass structure becomes low from fresh glass to weathered glass. (4) Cutting the Si-O network structure having long range order into one with short range order in the glass structure by weathering might make the bloating properties of glass particles more active than unweathered structure by heat treatment.
日本粘土学会の論文
1982-03-25