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CHARACTERIZATION OF ALUMINA/SILICON CARBIDE CERAMIC NANOCOMPOSITES

机译:氧化铝/碳化硅陶瓷纳米复合材料的表征

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Ceramics of an alumina matrix containing SiC reinforcements of approximately 100-300 nm diameter have been reported to have considerably higher strengths than monolithic polycrystalline aluminas. Niihara has reported strength increases from 320 MPa to 1050 MPa and an increase in fracture toughness from 3.1 MPa m~(1/2) to 4.7 MPa m~(1/2). Although strength and possibly toughness increases over those of similar grain size alumina have been reported by a number of workers, maximum strengths of only about 800 MPa have been achieved. In all cases the increase in strength is accompanied by a change in fracture mode from intergranular failure in the monolithic alumina to transgranular failure in the composite.
机译:据报道,含有直径约为100-300 nm的SiC增强材料的氧化铝基体陶瓷,其强度要比整体多晶氧化铝高得多。 Niihara报道了强度从320 MPa增加到1050 MPa,断裂韧性从3.1 MPa m〜(1/2)增加到4.7 MPa m〜(1/2)。尽管许多工人已经报告了强度和可能的韧性比类似粒度的氧化铝有所提高,但仅达到了约800 MPa的最大强度。在所有情况下,强度的增加都伴随着断裂模式的变化,从整体式氧化铝中的晶间破坏到复合材料中的跨晶破坏。

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