Determination of characteristic points on commercial glasses by differential thermal analysis

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  • 示差熱分析による実用ガラスの諸特性点の検出
  • シサネツ ブンセキ ニ ヨル ジツヨウ ガラス ノ ショ トクセイテン ノ ケンシュツ

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Description

Glass shows a continuous change of viscosity accompanied with several transformations in an extremely wide temperature range by heating, and the characteristics in this range have a special importance. The conventional viscosimetric or dilatometric methods of measurement about these characteristics can be applied only at a narrow temperature interval.<BR>The author recommended the DTA method as a useful one for the continuous measurement of glass characteristics throughout the above mentioned temperature range, i. e. from room temperature up to the fusing temperature.<BR>The suitable selected analytical conditions of the DTA as well as its optimum structual design enabled us to obtain accurate and stable DTA records of glass samples.<BR>DTA data on commercial glasses, e. g. lead glass, boro-silicate glass, non-alkali glass, and several optical glasses are examined, and a method of detecting the characteristic points of these glasses, including transformation points tg, annealing point ts, incipient deformation point Mg, softening point tsoft, sintering point tsint, flow point tf, and working point tw, is proposed from the exo- and endo-therm peak features.<BR>By the temperature readings of these characteristics points according to the up mentioned method and these corresponding viscosity values which decided by definitions, the possibility of drawing the temperature-viscosity curves for individual samples is suggested.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 14 (8), 692-697, 1965

    The Japan Society for Analytical Chemistry

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