Development of SiC-Whisker-Reinforced Lithium Aluminosilicate Matrix Composites by a Mixed Colloidal Processing Route

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...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1992-10, Vol.75 (10), p.2883-2886
Main Authors: Jang, Hyun M., Kim, Kwang S., Jung, Chang J.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
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Summary: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.m1/2 for the LAS specimen to 5.0 MPa.m1/2 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1992.tb05524.x