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采用低压化学气相渗透法制备了具有和不具有热解炭界面层的2.5维连续SiC纤维增强的SiC复合材料(SiC_f/SiC)。SiC纤维的体积分数为30%和41%。所制备复合材料的气孔率为20%左右。当纤维为30%时,沉积有0.1μm热解炭界面层的复合材料的弯曲强度由未加热解炭界面层的232MPa增加到328MPa,而且材料由灾难性断裂转变为非灾难性断裂。在同一制备条件下,纤维体积分数为41%的SiC_f/SiC比30%的SiC_f/SiC具有更高的气孔率。纤维为41%时,热解炭界面层厚度为0.1μm的SiC_f/SiC的弯曲强度只有244MPa,但是它具有更高的韧性和更长的纤维拔出长度。
A 2.5-D continuous SiC fiber-reinforced SiC composite (SiC_f / SiC) with and without pyrolytic carbon interfacial layer was prepared by low pressure chemical vapor infiltration. The volume fraction of SiC fibers is 30% and 41%. The prepared composite material has a porosity of about 20%. When the fiber is 30%, the bending strength of the composites deposited 0.1μm pyrolytic carbon interfacial layer increases from 232MPa to 328MPa at the non-pyrolytic carbon interfacial layer, and the material changes from disastrous to non-catastrophic. Under the same preparation conditions, SiC_f / SiC with fiber volume fraction of 41% had higher porosity than 30% SiC_f / SiC. When the fiber is 41%, the flexural strength of SiC_f / SiC with pyrolytic carbon interface layer thickness of 0.1μm is only 244MPa, but it has higher toughness and longer fiber pull-out length.