针对2D C/SiC复合材料存在碳布层间缺乏纤维增强,层间结合较差的问题,提出通过Z-向穿刺工艺提高碳布层间结合,克服材料使用时可靠性不高的问题,并比较了穿刺工艺对复合材料微观结构和力学性能的影响.结果表明,通过Z-向穿刺工艺制得试样2D C/SiC-Z_(pin)的弯曲强度、弯曲模量和剪切强度分别为247.8 MPa、37.8 GPa和32.1 MPa,而未穿刺试样2D C/SiC的弯曲强度、弯曲模量和剪切强度分别只有219.3 MPa、34.4 GPa和23.3 MPa,由此可见,采用Z-向穿刺工艺能明显提高复合材料的力学性能.微观结构分析认为,试样力学性能提高的根本原因在于采用Z-向穿刺纤维加强了碳布层间结合,使材料具有较好的整体性,克服了复合材料层间结合较弱对力学性能带来的不利影响.
In order to improve the poor laminar shear strength of 2D C/SiC composites without in-depth carbon fiber reinforcement, a novel proposal to increase shear strength by introducing Z-pin carbon fiber was presented, and accordingly effect of Z-pin process on the microstructure and mechanical properties of C/SiC-Z_(pin) was investigated. The results show that the flexural strength, flexural modulus and shear strength of 2D C/SiC-Z_(pin) composites were 247.8 MPa, 37.8 GPa and 32.1 MPa, respectively, while those of 2D C/SiC composites without Z-pin fiber reinforcement were 219.3 MPa, 34.4 GPa, and 23.3 MPa, respectively, leading to the conclusion that that Z-pin process enhances significantly the laminar shear strength of the composites. Further analysis of microstructure of the composites gives that the improvement of mechanical properties is ascribed to the strong laminar joining of carbon cloths after Z-pin fiber introduction, getting better integration of the composites and structure.
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