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Boron Carbide Reinforced Alumina Composites
Author(s) -
Liu Jenq,
Ownby P. Darrell
Publication year - 1991
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.1151-2916.1991.tb04081.x
Subject(s) - boron carbide , materials science , flexural strength , composite material , fracture toughness , boron , volume fraction , carbide , particle (ecology) , particle size , toughness , chemistry , oceanography , organic chemistry , geology
The mechanical properties of alumina have been successfully improved by adding isolated boron carbide particles of two different shapes. A K Ic of 7.26 ± 0.20 MPa · m 1/2 for alumina—boron carbide whiskerlike composites and of 5.27 ± 0.12 MPa · m 1/2 alumina—boron carbide shardlike particle composites has been achieved. The fracture toughness of these composites is dependent on the volume fraction of the boron carbide particles as well as their size and shape. The flexural strength is also appreciably enhanced to a constant value with from 5 to 20 vol% boron carbide additions. The whiskerlike particles increase the flexural strength by 25% and the shardlike particles produce a 47% improvement.