Boron Carbide Reinforced Alumina Composites
The mechanical properties of alumina have been successfully improved by adding isolated boron carbide particles of two different shapes. A KIC of 7.26 ± 0.20 MPa·m1/2 for alumina-boron carbide whiskerlike composites and of 5.27 ± 0.12 MPa·m1/2 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.
J. Liu and P. D. Ownby, "Boron Carbide Reinforced Alumina Composites," Journal of the American Ceramic Society, vol. 74, no. 3, pp. 674-677, Wiley-Blackwell, Mar 1991.
The definitive version is available at http://dx.doi.org/10.1111/j.1151-2916.1991.tb04081.x
Materials Science and Engineering
Keywords and Phrases
Mechanical Properties; Boron Carbide; Particles; Whiskers; Alumina
Article - Journal
© 1991 Wiley-Blackwell, All rights reserved.