Fracture behaviors of Al2O3-SiC composites containing various sizes and fraction of fine SiC particles

Indentation techniques were used to study the fracture behaviour of Al2O3-SiC composites containing SiC particles of various sizes (0.05, 0.17, and 2.5 micron) and fractions (1.5 (for 0.17 micron-sized particles only), 3, 6, 12 and 24 vol%). Vickers indentations (loads varying from 5 to 190 N) were...

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Bibliographic Details
Main Authors: ZHANG, D, YANG, H, YU, R, KAN, H, WENG, W, GE, M
Format: Conference Proceeding
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:Indentation techniques were used to study the fracture behaviour of Al2O3-SiC composites containing SiC particles of various sizes (0.05, 0.17, and 2.5 micron) and fractions (1.5 (for 0.17 micron-sized particles only), 3, 6, 12 and 24 vol%). Vickers indentations (loads varying from 5 to 190 N) were made at the centre of the tensile faces of test bars prepared from hot- pressed specimens. Flexural strengths were also determined from three-point bending tests. The fracture toughness and intrinsic flaw size of all the specimens were estimated from indentation strength and indentation dimension data. The fracture toughness and strength were analysed. Surface flaw-size in the specimens was reduced by the dispersed SiC particles due to an improved finish quality, and a dramatic increase in strength was obtained. It is suggested that the toughness behaviour of the composites is due to a positive effect from crack deflection and a negative effect from the residual thermal tensile stress. 8 refs.
ISSN:1013-9826
1662-9795