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Development of SiC‐Whisker‐Reinforced Lithium Aluminosilicate Matrix Composites by a Mixed Colloidal Processing Route
Author(s) -
Jang Hyun M.,
Kim Kwang S.,
Jung Chang J.
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.tb05524.x
Subject(s) - whisker , materials science , whiskers , composite material , monocrystalline whisker , fracture toughness , aluminosilicate , composite number , ceramic matrix composite , toughness , biochemistry , chemistry , catalysis
Based on the surface properties of aqueous silica, boehmite, and SiC‐whisker dispersions, SiC‐whisker‐reinforced lithium aluminosilicate (LAS) matrix composites were fabricated by a mixed colloidal processing route. The composites were characterized by a uniform spatial distribution of SiC whiskers throughout the matrix. The fracture toughness increased from 1.3 MPa.m 1/2 for the LAS specimen to 5.0 MPa.m 1/2 for the hot‐pressed composite (950°C and 20 MPa for 20 min) containing 20 wt% SiC whisker. The increase in fracture toughness appears to result mainly from crack deflection and crack bridging by whiskers with some additional toughenings from load transfer and whisker pullout.