Effect of crystallized phase on mechanical strength of hot-pressed composites of MgO-B_2O_3-Al_2O_3 type glass and Al_2O_3 filler

概要

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We optimized the crystallized phase for imparting high mechanical strength to a composite of MgO-B_2O_3-Al_2O_3 glass and Al_2O_3 filler by hot-press sintering to achieve densification at low temperature and annealing to induce crystallization. The selective crystallization of Al_4B_2O_9 and/or AlBO_3 successfully yielded a composite with high mechanical strength and low porosity. This required the use of a glass with a high Al_2O_3 content that retained its glassy character even when its entire Al_2O_3 content was converted to crystalline Al_4B_2O_9. The composite of MgO-B_2O_3-Al_2O_3 type glass and Al_2O_3 filler exhibited a higher mechanical strength than conventional borosilicate glass and Al_2O_3 filler composites, a porosity of about 1%, a low coefficient of thermal expansion, and was highly waterproof.
社団法人日本セラミックス協会の論文
2008-03-01