Liquid-phase sintering of alumina coated with magnesium aluminosilicate glass

Akira Nakajima; Gary L. Messing

doi:10.1111/j.1151-2916.1998.tb02464.x

Liquid-phase sintering of alumina coated with magnesium aluminosilicate glass

Akira Nakajima, Gary L. Messing

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45 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	1163-1172
Number of pages	10
Journal	Journal of the American Ceramic Society
Volume	81
Issue number	5
DOIs	https://doi.org/10.1111/j.1151-2916.1998.tb02464.x
State	Published - May 1998

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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10.1111/j.1151-2916.1998.tb02464.x

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title = "Liquid-phase sintering of alumina coated with magnesium aluminosilicate glass",

abstract = "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.",

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AU - Nakajima, Akira

AU - Messing, Gary L.

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N2 - 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.

AB - 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.

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Liquid-phase sintering of alumina coated with magnesium aluminosilicate glass

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