Study on the densification process of pottery body for building construction. (Part 2). Influence of heating and cooling rates on the densification of pottery body

Hideki Ishida, Osamu Watanabe

Research output: Contribution to journalArticle

Abstract

Using the isothermal method, the densification process of the pottery body was investigated. Feldspathic vitrified body with 57-59% of glassy phase and mullite vitrified body with 20-26% of glassy phase were found to have the Arrhenius relation between the temperature and the time necessary for the densification before the vitrification point. In addition, by developing this relation, the degree of the vitrification of pottery body under the heating-cooling and isothermal conditions can be expressed by the following equation. Under the isothermal condition: V = exp {-(A/T+C)}·t Under the heating-cooling condition: V=A/α exp (-C) [exp(-x)/x2/F(x)]x(1) x(2) F(x)=1- 2!/x + 3!/x2-... where V is the degree of vitrification, A and C are the constants for body, T is the absolute temperature (K), t is the soaking time (min), α is the heating or cooling rate (deg/min) and x = A/T. In order to investigate the validity of this equation, an experiment was carried out using a 58 m long roller hearth kiln. The results of the calculation and the experiment showed a good correspondence. It is thus believed that, evaluation of the influence of the heating and cooling rates as well as that of the temperature on the degree of vitrification, not extensively studied so far, has become possible.

Original languageEnglish
Pages (from-to)1006-1010
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume98
Issue number9
Publication statusPublished - 1990 Dec 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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