Low‐Temperature Sintering of Seeded Sol—Gel‐Derived, ZrO2‐Toughened Al2O3 Composites

Gary Lynn Messing, Masato Kumagai

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Seeding a mixture of boehmite (AIOOH) and colloidal ZrO2 with α‐alumina particles and sintering at 1400°C for 100 min results in 98% density. The low sintering temperature, relative to conventional powder processing, is a result of the small alumina particle size (∼0.3 μm) obtained during the θ‐to α‐alumina transformation, homogeneous mixing, and the uniform structure of the sol‐gel system. Complete retention of pure ZrO2 in the tetragonal phase was obtained to 14 vol% ZTA because of the low‐temperature sintering. The critical grain size for tetragonal ZrO2 was determined to be ∼0.4 μm for the 14 vol% ZrO2—Al2O3 composite. From these results it is proposed that seeded boehmite gels offer significant advantages for process control and alumina matrix composite fabrication.

Original languageEnglish (US)
Pages (from-to)40-44
Number of pages5
JournalJournal of the American Ceramic Society
Volume72
Issue number1
DOIs
StatePublished - Jan 1 1989

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Aluminum Oxide
Alumina
Sintering
Composite materials
Powders
Process control
Gels
Particle size
Fabrication
Processing
Temperature
aluminum oxide hydroxide

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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title = "Low‐Temperature Sintering of Seeded Sol—Gel‐Derived, ZrO2‐Toughened Al2O3 Composites",
abstract = "Seeding a mixture of boehmite (AIOOH) and colloidal ZrO2 with α‐alumina particles and sintering at 1400°C for 100 min results in 98{\%} density. The low sintering temperature, relative to conventional powder processing, is a result of the small alumina particle size (∼0.3 μm) obtained during the θ‐to α‐alumina transformation, homogeneous mixing, and the uniform structure of the sol‐gel system. Complete retention of pure ZrO2 in the tetragonal phase was obtained to 14 vol{\%} ZTA because of the low‐temperature sintering. The critical grain size for tetragonal ZrO2 was determined to be ∼0.4 μm for the 14 vol{\%} ZrO2—Al2O3 composite. From these results it is proposed that seeded boehmite gels offer significant advantages for process control and alumina matrix composite fabrication.",
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Low‐Temperature Sintering of Seeded Sol—Gel‐Derived, ZrO2‐Toughened Al2O3 Composites. / Messing, Gary Lynn; Kumagai, Masato.

In: Journal of the American Ceramic Society, Vol. 72, No. 1, 01.01.1989, p. 40-44.

Research output: Contribution to journalArticle

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AB - Seeding a mixture of boehmite (AIOOH) and colloidal ZrO2 with α‐alumina particles and sintering at 1400°C for 100 min results in 98% density. The low sintering temperature, relative to conventional powder processing, is a result of the small alumina particle size (∼0.3 μm) obtained during the θ‐to α‐alumina transformation, homogeneous mixing, and the uniform structure of the sol‐gel system. Complete retention of pure ZrO2 in the tetragonal phase was obtained to 14 vol% ZTA because of the low‐temperature sintering. The critical grain size for tetragonal ZrO2 was determined to be ∼0.4 μm for the 14 vol% ZrO2—Al2O3 composite. From these results it is proposed that seeded boehmite gels offer significant advantages for process control and alumina matrix composite fabrication.

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