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Preparation and Characterization of Aluminum Borate
Author(s) -
Ray Siba P.
Publication year - 1992
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.1151-2916.1992.tb05622.x
Subject(s) - boron , aluminium , stoichiometry , materials science , sintering , ceramic , thermal expansion , characterization (materials science) , dielectric , mineralogy , analytical chemistry (journal) , nuclear chemistry , metallurgy , chemistry , nanotechnology , organic chemistry , chromatography , optoelectronics
Aluminum borate, 9Al 2 O 3 ·2B 2 O 3 or Al 18 B 4 O 33 , was synthesized by the reaction of stoichiometric amounts of α‐Al 2 O 3 and B 2 O 3 . The Al 18 B 4 O 33 material was formed into a dense ceramic by pressureless sintering with CaO, MgO, or CaAl 2 B 2 O 7 additives. The material was characterized by low bulk density, moderate coefficient of thermal expansion (3 × 10 −6 /°C to 5 × 10 −6 /°C), moderate strength (210 to 324 MPa), and low dielectric constant.