Fabrication of short carbon fibre reinforced SiC multilayer composites by tape casting
Fabrication of short carbon fibre reinforced SiC multilayer composites by tape casting
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DOI：
10.1016/j.ceramint.2011.08.024
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发表时间：
2012-03
影响因子：
5.2
通讯作者：
Wenshu Yang;L. Fuso;S. Biamino;D. Vasquez;C. Bolivar;P. Fino;C. Badini
中科院分区：
文献类型：
--
作者：
Wenshu Yang;L. Fuso;S. Biamino;D. Vasquez;C. Bolivar;P. Fino;C. Badini
采用流延法和无压烧结法制备了含短碳纤维的碳化硅多层复合材料（Csf/SiC）。将C纤维分散在溶剂中，然后与SiC浆料混合，制成绿色Csf/SiC带。在BYK-163、BYK-410、BYK-2150、BYK-9076、BYK-9077和TritonX-100分散剂中，TritonX-100对Toho Tenax HTC 124纤维（带水溶性涂层）的分散效果最好。Csf/SiC多层复合材料获得纤维（平均纤维长度为3、4.5和6 mm）。添加短C纤维似乎恶化了Csf/SiC多层复合材料的致密化过程，而在Csf/SiC中也观察到各向异性收缩。加入C纤维后，开孔尺寸略有增加，但随着纤维平均长度的增加而减小。机械性能受到高残余孔隙率的影响。短C纤维的加入并没有改变弱界面处的裂纹偏转。与短纤维（3 mm）相比，长纤维（4.5和6 mm）的Csf/SiC多层复合材料具有更高的弹性模量、抗弯强度和维氏硬度。改善烧结性能和纤维含量是改善机械性能所必需的。
Silicon carbide multilayer composites containing short carbon fibres (Csf/SiC) were prepared by tape casting and pressureless sintering. C fibres were dispersed in solvents and then mixed with SiC slurry to make green Csf/SiC tape. Triton X-100 was found to be the best one for Toho Tenax HTC124 fibres (with water soluble coating) among BYK-163, BYK-410, BYK-2150, BYK-9076, BYK-9077 and Triton X-100 dispersants. Csf/SiC multilayer composites containing 5vol.% fibre (mean fibre length of 3, 4.5, and 6mm) were obtained. Addition of short C fibres seems to worsen the densification process in the Csf/SiC multilayer composites, whereas anisotropy shrinkage in Csf/SiC was also observed. Open pores size was increased slightly after the addition of C fibre but it decreased with the mean fibre length. Mechanical properties were affected by high residual porosity. The addition of short C fibre has not changed the crack deflection at weak interfaces. Csf/SiC multilayer composites containing longer fibres (4.5 and 6mm) presented higher elastic modulus, bending strength and Vickers hardness as compared to shorter fibres (3mm). Improved sintering performance and fibre content are necessary to improve mechanical properties.