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Mechanical properties of SiC fiber-reinforced reaction-bonded Si3N4 composites

机译:SiC纤维增强反应结合Si3N4复合材料的力学性能

摘要

The room temperature mechanical and physical properties of silicon carbide fiber reinforced reaction-bonded silicon nitride composites (SiC/RBSN) have been evaluated. The composites contained 23 and 40 volume fraction of aligned 140 micro m diameter chemically vapor deposited SiC fibers. Preliminary results for composite tensile and bend strengths and fracture strain indicate that the composites displayed excellent properties when compared with unreinforced RBSN of comparable porosity. Fiber volume fraction showed little influence on matrix first cracking strain but did influence the stressed required for matrix first cracking and for ultimate composite fracture strength. It is suggested that by reducing matrix porosity and by increasing the volume fraction of the large diameter SiC fiber, it should be possible to further improve the composite stress at which the matrix first cracks.
机译:已经评估了碳化硅纤维增强的反应结合氮化硅复合材料(SiC / RBSN)的室温力学性能和物理性能。该复合物包含23和40体积分数的对齐的140微米直径化学气相沉积的SiC纤维。复合材料的拉伸强度,弯曲强度和断裂应变的初步结果表明,与孔隙率相当的未增强RBSN相比,复合材料显示出优异的性能。纤维体积分数对基体首次开裂应变几乎没有影响,但确实影响了基体首次开裂和最终复合材料断裂强度所需的应力。建议通过降低基体孔隙率和增加大直径​​SiC纤维的体积分数,应有可能进一步改善基体首先开裂的复合应力。

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    Bhatt R. T.;

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  • 年度 1985
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