Microstructure and mechanical properties of C/C-SiC composites fabricated by a rapid processing method
Microstructure and mechanical properties of C/C-SiC composites fabricated by a rapid processing method
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DOI：
10.1016/j.jeurceramsoc.2009.04.036
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发表时间：
2009-11
影响因子：
5.7
通讯作者：
Jiping Wang;Min-Feng Lin;Zhuo Xu;Yong Zhang;Zhongqi Shi;Junmin Qian;G. Qiao;Z. Jin
中科院分区：
文献类型：
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作者：
Jiping Wang;Min-Feng Lin;Zhuo Xu;Yong Zhang;Zhongqi Shi;Junmin Qian;G. Qiao;Z. Jin
采用两步法制备C/C-SiC复合材料，节省了时间，降低了成本。以煤油为前驱体，采用热梯度CVI法，在2- 5 h内将准三维碳纤维毡致密化为C/C复合材料。然后对不同孔隙率的C/C复合材料进行反应渗硅40 min，得到C/C-SiC复合材料。研究了C/C复合材料孔隙率对C/C-SiC复合材料显微结构和力学性能的影响。结果表明，随着C/C复合材料孔隙率的增加，C/C-SiC复合材料的密度从2.0g/cm ~ 3增加到2.3g/cm ~ 3，孔隙率从5.8%降低到1.7%。C/C-SiC复合材料的孔隙率不仅影响β-SiC、Si相的含量，而且影响其力学性能。C/C-SiC复合材料的弯曲强度和弯曲模量远高于C/C复合材料。孔隙率为19.7%的C/C复合材料的弯曲强度和弯曲模量最高，分别为132 MPa和14.4GPa。
C/C–SiC composite was fabricated with time efficiency and low cost by a two-step process. A quasi 3D carbon-fiber-felt was firstly densified to C/C composite in 2–5h by a thermal gradient CVI method based on precursor of kerosene. Then, the C/C composite of different porosities was reactively infiltrated with Si for 40min to obtain C/C–SiC composite. The influence of the porosity of the C/C composite on the microstructure and mechanical properties of the C/C–SiC composite was investigated. The results show that the density of the C/C–SiC composite increases from 2.0g/cm3to 2.3g/cm3while its porosity decreases from 5.8% to 1.7% with the increasing porosity of the C/C composite. Moreover, the porosity of the C/C composite affects both the amounts of β-SiC, Si phases and the mechanical properties of the C/C–SiC composite. The flexural strength and modulus of the C/C–SiC composite are much higher than those of the C/C composite. The C/C–SiC composite from the C/C composite of 19.7% porosity has the highest flexural strength and modulus, which are 132MPa and 14.4GPa, respectively.