Preparation and mechanical properties of high-purity Al2O3 fibre/Al2O3 matrix composite
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Al2O3 matrix composites with unidirectionally oriented high-purity Al2O3 fibre with and without carbon coating, were fabricated by the filament-winding method, followed by hot-pressing at 1573–1773 K. The composite with non-coated Al2O3 fibre exhibited a bending strength (594 MPa) comparable to that of monolithic Al2O3 (589 MPa). While the composite with a carbon-coated fibre had lower strength (477 MPa), it showed improved fracture toughness (6.5 MPa m1/2) compared to the composite with an uncoated fibre (4.5 MPa m1/2) and monolithic Al2O3 (5.5 MPa m1/2). This toughness enhancement was explained based on the increased crack extension resistance caused by the fibre pull-out observed by SEM at the notch tip.
KeywordsCarbon Coating Matrix Interface Improve Fracture Toughness Toughness Enhancement Al2O3 Fibre
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- 3.Chemical Society of Japan (ed.), “Kagaku Binran”, 3rd Edn (Maruzen, Tokyo, 1984) p. II–92.Google Scholar