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作 者:庞生洋[1] 王佩瑶 胡成龙[1] 赵日达[1] 汤素芳 PANG Sheng-Yang;WANG Pei-Yao;HU Cheng-Long;ZHAO Ri-Da;TANG Su-Fang(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110116,China;Northeastern University,Shenyang 110819,China)
机构地区:[1]中国科学院金属研究所,沈阳110016 [2]东北大学,沈阳110819
出 处:《无机材料学报》2019年第12期1272-1278,共7页Journal of Inorganic Materials
基 金:国家自然科学基金(U1537204,51802313);国家重点研发计划(2018YFF01013600);装备预研项目(61409220101);青促会优秀会员人才项目(2014171)~~
摘 要:以2D碳纤维预制体为增强体,采用电耦合和等温化学气相渗联合工艺制备C/C复合材料,研究不同预制体结构对C/C复合材料及其螺栓力学性能的影响。结果表明,不同预制体结构增强的C/C复合材料表现出不同的力学行为。对于针刺结构,随着针刺密度由35 pin/cm2降至25 pin/cm2,C/C复合材料的拉伸、弯曲强度分别由60.1、119.9 MPa增大至69.5、176.8 MPa;随着碳纱丝束由12 K变为3 K,C/C复合材料的拉伸、弯曲强度分别由69.5、176.8 MPa增大至105.5、184.4 MPa。对于12 K双向缝合结构,C/C复合材料的拉伸、弯曲强度分别为68.1、123.7 MPa。不同碳纤维预制体结构增强的C/C复合材料力学性能的差异主要取决于长纤维的完整性、大孔的分布和数量等因素。C/C复合材料的螺栓性能由于体材料性能和加工过程中缺陷的影响,其拉伸强度略低于其体材料,并表现出更为明显的脆性断裂模式。The C/C composites reinforced by 2D-preforms were fabricated using an electro-coupling chemical va-por infiltration(E-CVI)technique.The effects of different preform's structure on the mechanical properties of C/C and their bolts were investigated.The results show that the C/C composites reinforced by different preforms pa-rameters exhibit different mechanical behaviors.For needle-punched preforms,as the needle-punched density de-creasing from 35 pin/cm2 to 25 pin/cm2,the tensile and flexural strengths of C/C composites increased from 60.1,119.9 MPa to 69.5,176.8 MPa,respectively.With the carbon yarn tow changing from 12 K to 3 K,the tensile and flexural strengths of C/C composites increased from 69.5,176.8 MPa to 105.5,184.4 MPa,respectively.For bidi-rectional stitched preforms,the tensile and flexural strengths of C/C composites are 68.1 and 123.7 MPa,respec-tively.The different mechanical behaviors is mainly attributed to structural integrity of long fibers,and the distribu-tion and quantity of large pores.The mechanical properties of bolts are impacted by their bulk materials and surface status,which are slightly lower than those of their counterparts.
分 类 号:TG174[金属学及工艺—金属表面处理]
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