Study of Interfaces in SiC Fiber Reinforced Nickel-Based Composites

Acta Metall Sin

2007, Vol. 43

Issue (4): 444-448 DOI:

Research Articles

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Study of Interfaces in SiC Fiber Reinforced Nickel-Based Composites

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东北大学

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. Study of Interfaces in SiC Fiber Reinforced Nickel-Based Composites. Acta Metall Sin, 2007, 43(4): 444-448 .

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Abstract Interface reaction between SiC fiber and matrix is a major problem which directly influences the mechanical properties. In this article, the SiO2-Al2O3,C-Al2O3 layers have been coated on the surface of the SiC fibers as the barrier layer to inhibit the SiCf/Ni element mutual diffusion. The SiCf/Ni composites have been prepared by vacuum heat press. The coatings can effectively block the SiCf/Ni element mutual diffusion and protect fiber’s integration well after heat treatment in vacuum at 850-950℃ for150 hours. The SEM observation indicated that a compact Al2O3 layer is well coated on the surface of the fiber. In contrast, the SiO2 coating is weakness and brittleness combine with fiber, and some cracks in the interface can be seen clearly. The C layer in the C-Al2O3 coating disappeared and dissolved after heat treatment at 850-950℃ for 100 hours.

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Received: 27 June 2006

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TG146.2

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