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Forming and Sintering of in Situ Alumina Composite with Hydraulic Inorganic Binder
Author(s) -
Nagaoka Takaaki,
Iwamoto Yuji,
Kikuta Koichi,
Hirano Shinichi
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01439.x
Subject(s) - materials science , sintering , aluminate , barium , amorphous solid , composite number , phase (matter) , chemical engineering , flexural strength , composite material , mineralogy , metallurgy , chemistry , crystallography , cement , organic chemistry , engineering
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 (BaAl 2 O 4 ), and the other was barium aluminate binder (BAH binder) composed of amorphous phase, barium aluminate monohydrate (BaAl 2 O 4 ·H 2 O), and BaAl 2 O 4 . 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 BaAl 2 O 4 powders to Al 2 O 3 powders improved the bending strength of Al 2 O 3 matrix green bodies. The synthesized BaAl 2 O 4 powders led to the in situ forming of barium hexaaluminate (BaO· x Al 2 O 3 , x = 6.9: BA6) platelets in the matrix by reacting with Al 2 O 3 during sintering. The formed BA6 platelets inhibited the grain growth of the matrix Al 2 O 3 grains.