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首页> 外文期刊>Journal of the Ceramic Society of Japan >The carbon black effect on crack formation during pyrolysis step in liquid silicon infiltration process for Cf/C-SiC composites
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The carbon black effect on crack formation during pyrolysis step in liquid silicon infiltration process for Cf/C-SiC composites

机译：炭黑对Cf / C-SiC复合材料液硅渗透过程中热解步骤中裂纹形成的影响

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摘要

The formation of crack patterns during the pyrolysis step, which converts the carbon fiber-reinforced plastic composite (CFRP) to a Cf/C composite as one step in the liquid silicon infiltration (LSI) process, was investigated. Generally, cracks occur as a result of variances in thermal shrinkage between the matrix and the fiber during pyrolysis. The addition of carbon black powder as a filler resulted in a reduction in the shrinkage, but more cracks were formed. The transversal crack increased, and the partial delamination was newly occurred as the filler was increased. The properties of the matrices also changed; the fracture toughness decreased, and the void area increased. Consequently, the crack formation occurs not only by the thermal shrinkage difference between fiber and matrix but also the effect of matrix fracture toughness or void content. The flexural strength of LSI-processed samples was also measured, and the filler improved the mechanical strength but reduced its reliability.
机译：在热解步骤中形成裂纹图案，该裂化步骤将碳纤维增强塑料复合材料（CFRP）转变为C f / C复合物，这是液态硅渗透（LSI）过程的一个步骤。调查。通常，由于热解过程中基体和纤维之间的热收缩差异而产生裂纹。加入炭黑粉作为填料可减少收缩率，但会形成更多的裂纹。横向裂纹增加，并且随着填料的增加，新出现部分分层。矩阵的属性也发生了变化。断裂韧性降低，空隙率增加。因此，不仅由于纤维与基体之间的热收缩差而产生裂纹，而且还由于基体断裂韧性或空隙率的影响而产生裂纹。还测量了LSI处理的样品的抗弯强度，填料提高了机械强度，但降低了其可靠性。

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