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Microstructure and mechanical properties of short-carbon-fiber/TiSiC composites

Journal of Advanced Ceramics, ISSN: 2227-8508, Vol: 9, Issue: 6, Page: 716-725
2020
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Article Description

Short-carbon-fibers (C) reinforced TiSiC matrix composites (C/TiSiC, the C content was 0 vol%, 2 vol%, 5 vol%, and 10 vol%) were fabricated by spark plasma sintering (SPS) using TiSiC powders and C as starting materials at 1300 °C. The effects of C addition on the phase compositions, microstructures, and mechanical properties (including hardness, flexural strength (σ), and K) of C/TiSiC composites were investigated. The C, with bi-layered transition layers, i.e., TiC and SiC layers, were homogeneously distributed in the as-prepared C/TiSiC composites. With the increase of C content, the K of C/TiSiC composites increased, but the σ decreased, and the Vickers hardness decreased initially and then increased steadily when the C content was higher than 2 vol%. These changed performances (hardness, σ, and K) could be attributed to the introduction of C and the formation of stronger interfacial phases.

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