HOT-PRESSING OF ACICULAR MULLITE FINE POWDERS PREPARED BY HYDROTHERMAL CRYSTALLIZATION OF AMORPHOUS POWDERS HYDROLYZED MIXED ALKOXIDES.

Toshihide Yamaguchi, Matsuo Suzuki, Shun ichi Hiraishi, Masahiro Yoshimura, Shigeyuki Somiya

Research output: Contribution to journalArticle

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Abstract

In order to characterize the mullite powder prepared by hydrothermal crystallization of amorphous powder obtained by hydrolysis of mixed alkoxides (Al//2O//3/SiO//2 mol ratio equals 3/2), hot-pressing experiments were conducted in graphite at 1400 degree to 1600 degree C under 20 to 40 MPa for 0 to 30 min. Mullite ceramics hot-pressed at 1600 degree C under 40 MPa for 30 min had a bulk density of 3. 1 g/cm**3 for every powder. But below 1600 degree C, crystallized mullite powder gave less dense ceramics than the amorphous powder. Flexural strength was 195 MPa for mullite ceramics prepared by hot-pressing of powders crystallized hydrothermally at 600 degree C under 20 MPa for 24 h at 1600 degree C under 20 MPa for 30 min.

Original languageEnglish
Pages (from-to)101-104
Number of pages4
JournalYogyo Kyokai Shi/Journal of the Ceramic Society of Japan
Volume93
Issue number2
Publication statusPublished - 1985 Jan 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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