1994•Journal of the American Ceramic SocietyRequires access

Devitrification of the Grain Boundary Glassy Phase in a High‐Alumina Ceramic Substrate

Cynthia A. Powell‐Doǧan, A. H. Heuer, H. M. O’Bryan

Abstract

Devitrification of the (Na, Mg, Ca) aluminosilicate glass phase in a high‐alumina (>99%) ceramic substrate has been studied by TEM. MgAl 2 O 4 (spinel) and a Ca‐rich plagio‐clase (a solid solution between CaAl 2 Si 2 0 8 (anorthite) and NaAlSi 3 O 8 (albite)) are the dominant crystalline phases. Significant spatial variability exists both in the extent of crystallization and in the glass composition.

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Key concepts: Devitrification, Anorthite, Spinel, Mineralogy, Albite, Materials science, Crystallization, Aluminosilicate