Liquid-phase sintering of alumina coated with magnesium aluminosilicate glass

Akira Nakajima, Gary L. Messing

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42 Scopus citations


Densification of alumina coated with a MgO-Al2O3-SiO2 (MAS) glass was investigated from 1400° to 1460°C. Spinel was observed to form at the liquid-alumina interface, whereas mullite crystallized uniformly in the liquid. Spinel and mullite crystallization kinetics were accelerated by smaller alumina particle size. Mullite and spinel crystallization retarded densification by forming a percolating network. Boron doping suppressed spinel formation, and thus alumina sintered to higher densities at low temperature. The concept of glass basicity is proposed as a useful guide for selecting dopants for low-temperature sintering.

Original languageEnglish (US)
Pages (from-to)1163-1172
Number of pages10
JournalJournal of the American Ceramic Society
Issue number5
StatePublished - May 1998

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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