シラスに含まれる火山ガラスの粒子形状によるガラス構造の変化と加熱発ぽう性

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タイトル別名
  • The Variation of the Glass Structure and Foaming Characteristics of Volcanic Glass Particles with Different Shape in the Shirasu
  • シラス ニ フクマレル カザン ガラス ノ リュウシ ケイジョウ ニヨル ガラ

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抄録

Various kinds of volcanic glass particles with different shape are contained in the Shirasu, which is a kind of acidic volcanic ejecta occurred in the southern Kyushu. The volcanic glass particles can be classified into five kinds of shape under the microscopic observation such as plate, needle-bundle, spongy, mussive and foamed bubble type. The glass structures of these glasses were analysed on the basis of radial distribution function obtained from the data of X-ray powder diffraction. The bloated lightweight particles were made the each samples by heat treatment using small scaled rotary kiln. And, comparing the obsidian and perlite occured in Imari district with Shirasu glass, the relationship between glass structure and foaming characteristics of Shirasu glasses were discussed. The results obtained are summarized:<br>1) The weathering of volcanic glass in the Shirasu (Shirasu glass) seemed to proceed in the order of plate, needle-bundle and spongy type. In general, volcanic glass is changed into clay minerals by wethering, however, Shirasu glass seemed not to have been completely altered into clay mineral structures judging from the pattern of X-ray powder diffraction.<br>2) The water molecule content in Shirasu glass was increased by the reaction with secondary water. Cutting the Si-O network structure having long range order into the one with short range order in the glass structure by secondary hydration might make the viscosity of glass decrease at high temperature.<br>3) Long range order of the glass structure became low from the plate and needle-bundle type to the spongy type Shirasu glass.<br>4) The Shirasu glass was similar to perlite in the glass structure, however, foaming characteristics of the needle-bundle and spongy type were lower than those of perlite. This relation seemed depend on the particle shape and texture.<br>5) The plate type Shirasu glass and perlite were similar in the glass structure and foaming characteristics, however, the shape and number of bubble in the bloated particles were different between them.

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  • 窯業協會誌

    窯業協會誌 90 (1045), 503-510, 1982

    公益社団法人 日本セラミックス協会

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