Forming and Sintering of in Situ Alumina Composite with Hydraulic Inorganic Binder

Two types of barium aluminate binders were prepared by heat treatment of barium aluminate precursors, synthesized by using solution processes, at low temperatures (T < 500°C). One was barium monoaluminate (BaAl2O4), and the other was barium aluminate binder (BAH binder) composed of amorphous phas...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 83; no. 7; pp. 1613 - 1616
Main Authors Nagaoka, Takaaki, Iwamoto, Yuji, Kikuta, Koichi, Hirano, Shin-ichi
Format Journal Article
LanguageEnglish
Published Westerville, Ohio American Ceramics Society 01.07.2000
Blackwell
Wiley Subscription Services, Inc
Subjects
alumina
Applied sciences
binders/binding
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
composites
Exact sciences and technology
Miscellaneous
Technical ceramics
Inorganic binder
Sintering
Chemical preparation
Mechanical properties
Manufacturing
Barium Aluminates
Experimental study
Hydraulic binder
Microstructure
Alumina
Oxide ceramics
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Summary:Two types of barium aluminate binders were prepared by heat treatment of barium aluminate precursors, synthesized by using solution processes, at low temperatures (T < 500°C). One was barium monoaluminate (BaAl2O4), and the other was barium aluminate binder (BAH binder) composed of amorphous phase, barium aluminate monohydrate (BaAl2O4·H2O), and BaAl2O4. The setting time of the BAH binder was controlled by adjusting the heat‐treatment temperature of the BAH binder precursor. The addition of the synthesized BaAl2O4 powders to Al2O3 powders improved the bending strength of Al2O3 matrix green bodies. The synthesized BaAl2O4 powders led to the in situ forming of barium hexaaluminate (BaO·xAl2O3, x= 6.9: BA6) platelets in the matrix by reacting with Al2O3 during sintering. The formed BA6 platelets inhibited the grain growth of the matrix Al2O3 grains.
Bibliography:ark:/67375/WNG-3H1BS4Z6-R
istex:6DFE03950CE0A7A2AE081B2F68DEAC8ED0DAB2E9
ArticleID:JACE1613
R.S. Roth—contributing editor
Fellow, American Ceramic Society.
Member, American Ceramic Society.
Supported by NEDO as part of the Synergy Ceramics Project under the Industrial Science and Technology Frontier (ISTF) Program promoted by AIST, MITI, Japan. The authors are members of the Joint Research Consortium of Synergy Ceramics.
Present address: Japan Fine Ceramics, Nagoya, 456‐8587, Japan.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2000.tb01439.x