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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.116  No.1351 (March) (2008)  >  pp.475-480

Journal of the Ceramic Society of Japan
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Effect of crystallized phase on mechanical strength of hot-pressed composites of MgO-B2O3-Al2O3 type glass and Al2O3 filler

Masahide OKAMOTO1), Hironori KODAMA2) and Kazuo SHINOZAKI3)
1) Production Engineering Research Laboratory, Hitachi Ltd.
2) Hitachi Research Laboratory, Hitachi Ltd.
3) Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology


  We optimized the crystallized phase for imparting high mechanical strength to a composite of MgO-B2O3-Al2O3 glass and Al2O3 filler by hot-press sintering to achieve densification at low temperature and annealing to induce crystallization. The selective crystallization of Al4B2O9 and/or AlBO3 successfully yielded a composite with high mechanical strength and low porosity. This required the use of a glass with a high Al2O3 content that retained its glassy character even when its entire Al2O3 content was converted to crystalline Al4B2O9. The composite of MgO-B2O3-Al2O3 type glass and Al2O3 filler exhibited a higher mechanical strength than conventional borosilicate glass and Al2O3 filler composites, a porosity of about 1%, a low coefficient of thermal expansion, and was highly waterproof.



Keyword:
Glass-ceramics, Composites, Crystallization, Hot pressing, Mechanical strength, MgO-B2O3-Al2O3 glass

Received: August 15, 2007
Accepted: January 17, 2008 , Published online: March 01, 2008
Copyright (c) 2008 The Ceramic Society of Japan

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