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研制了一套表征碳/碳(C/C)复合材料界面力学性能的单丝顶出测试系统,实现了对碳纤维的单丝顶出测试。利用该仪器测定了不同工艺条件下制备的几组C/C复合材料样品的界面粘接性能,研究了界面剪切强度和复合材料拉伸强度之间的关系。 相似文献
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原位法表征碳/碳复合材料界面性能的研究 总被引:1,自引:0,他引:1
用单丝顶出和束顶出法分别测试了细编穿刺碳/碳(C/C)复合材料不同层次的界面粘结性能,研究了生产工艺对不同层次界面性能的影响,建立了顶出试验的力学模型,并用有限元方法分析了界面上应力的分布情况,对可能的界面破坏模式进行了预测,为最终优化C/C复合材料的生产工艺提供了依据。 相似文献
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本文用自制装置研究了多向细编C/C复合材料纤维束性能,分析了工艺过程的影响。同时用界面微脱粘实验技术研究了C/C复合材料界面性能,给出了相应的理论模型和界面应力分布,提出了由界面脱粘力,纤维、基体和复合材料性能表征界面剪切强度的方法,为C/C复合材料优化设计提供了定量参数。结果表明:织物结构、织物编织工艺以及织物/基体复合对纤维的强度影响很大,降为原始纤维的20%左右,对模量影响小。不同界面层次,纤维/基体的界面结合情况和界面剪切强度不同,Z向纤维束中纤维/基体结合好,具有最高的结合强度,SEM观察证实有大量基体碳在纤维上枝联。 相似文献
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中间相沥青具有高残碳率、高密度、低的密度变化及易石墨化等优点,是较理想的碳/碳复合材料基体前驱体。本文从C/C复合制备工艺的角度,阐述了制备C/C复合材料用的中间相的主要特性,其中包括中间相的流动性,在碳化过程中的稳定化、、微观结构以及中间相基C/C复合材料的界面结构。 相似文献
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化学气相沉积碳/碳复合材料性能研究 总被引:1,自引:0,他引:1
分析了化学气相沉积碳/碳(C/C)复合材料的刹车力矩和刹车速度的关系曲线及影响因素,结果表明,刹车力矩一刹车速度曲线上的初始力矩峰值随着摩擦界面温度的升高而增大,提高材料的石墨化度、改变刹车盘的结构、降低刹车比压的施加速度都可以降低初始力矩峰值,改善C/C材料的摩擦性能.C/C复合材料具有良好的自润滑性能,其磨损率仅为1.2×10-3mm/次.它们具有较高的机械性能和热物理性能,完全可以满足飞机刹车的要求. 相似文献
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通过理论模型和界面顶出实验分析了微观结构对碳/碳复合材料界面性能的影响机制。使用高分辨Micro-CT系统获得C/C复合材料界面的微观结构特征,并对界面的微观结构特征进行统计分析,得到界面微观结构尺度分布的概率密度函数。对C/C复合材料的界面层建立力学分析模型,计算获得C/C复合材料界面力学性能,在计算过程中引入界面微观结构的随机性统计分布,获得C/C复合材料界面力学性能的分布规律。设计纤维束顶出实验,测试分析C/C复合材料的界面力学性能。将力学分析模型的计算结果与界面顶出实验获得的实验结果进行对比分析,表明通过模型计算获得的界面性能的均值和离散度与实验获得的结果具有较好的一致性。 相似文献
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碳/碳复合材料及其在航空上的应用前景 总被引:8,自引:0,他引:8
本文分四部分论述了碳/碳(以下称为C/C)复合材料及其发展形势:C/C复合材料的现状,工艺,性能及应用:C/C复合材料的制造工艺及其发展趋势:C/C复合材料的抗氧化保护涂层;C/C复合材料在航空上的应用前景。最后指出:C/C复合将逐渐由短期应用走向长期应用,制造工艺将由长时间走向短时间,抗氧化保护涂层将由单纯的表面涂覆走向立体多重涂覆,成本将大大降低,主要应用范围将逐渐由航天技术的结构功能材料发展 相似文献
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Ling LIU Boming ZHANG Zhanjun WU Dianfu WANGCenter for Composite Materials Harbin Institute of Technology Harbin ChinaProf. 《材料科学技术学报》2005,21(1):87-91
This work aims at designing a set of curing pressure routes to produce laminates with various void contents. The effects of various consolidation pressures resulting in different void contents on mechanical strength of carbon/epoxy laminates have been examined. Characterization of the voids, in terms of void volume fraction, void distribution, size, and shape, was performed by standard test, ultrasonic inspection and metallographic analysis. The interlaminar shear strength was measured by the short-beam method. An empirical model was used to predict the strength vs porosity. The predicted strengths conform well with the experimental data and voids were found to be uniformly distributed throughout the laminate. 相似文献
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本文根据连续介质理论,采用代表性体积元的方法计算了碳纳米管增强铝基复合材料的力学性能。使用有限元软件ABAQUS对代表性体积元模型进行分析,研究了不同碳纳米管体积分数对复合材料弹性模量、屈服强度、泊松比及剪切模量的影响。结果表明碳纳米管体积分数对复合材料力学性能有显著影响,随着碳纳米管体积分数的增加,复合材料的弹性模量、屈服强度及剪切强度都明显提高,泊松比略有下降。 相似文献
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对国产炭纤维与T300炭纤维复合材料层合板在常温干态、常温湿态、高温干态与高温湿态四种环境条件下进行了短梁剪切实验.采用宏观和微观相结合的方法,对其剪切性能、失效模式与损伤机理进行了对比研究.结果表明:界面性能是影响纤维树脂基复合材料剪切性能与失效模式最为重要的因素,而国产炭纤维复合材料在界面性能的控制上还有待改进.因... 相似文献
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Michael Q. Tran Kingsley K.C. Ho Gerhard Kalinka Milo S.P. Shaffer Alexander Bismarck 《Composites Science and Technology》2008,68(7-8):1766-1776
The quality of interfacial interaction is dictated by the surface chemistry of the carbon fibres and the composition of the matrix. The composition of poly(vinylidene fluoride) (PVDF) was modified by the addition of maleic anhydride grafted PVDF. The surface properties of the various matrix formulations were characterised by contact angle and electrokinetic measurements. Carbon fibres were modified by industrial electrochemical oxidation and oxidation in nitric acid, or the use of a traditional epoxy-sizing of industrially oxidised fibres. The surface composition, morphology and wetting behaviour of the carbon fibres was characterised. The interaction between modified PVDF and the carbon fibres was studied by direct contact angle measurements between PVDF melt on single carbon fibres and by single fibre pull-out tests. The best wetting and adhesion behaviour was achieved between PVDF containing 5 ppm grafted maleic anhydride (MAH) and epoxy-sized carbon fibres. The addition of MAH-grafted PVDF to the unmodified PVDF caused the apparent interfacial shear strength to increase by 184%. The apparent interfacial shear strength of this fibre–matrix combination allowed for the utilisation of 100% of the yield tensile strength of PVDF. 相似文献
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Renée K. Duncan Xinyu G. Chen J.B. Bult L.C. Brinson L.S. Schadler 《Composites Science and Technology》2010
This paper presents a bulk composite method for determining the critical aspect ratio and relative interfacial shear stress (ISS) for multiwalled carbon nanotube (MWNT)/polymer composites. Through a modified pullout test and fragmentation test, it was found that the critical aspect ratio was 300 and decreased by a factor of 3 due to surface modification, and that MWNTs at an angle of greater than 60° to the loading direction failed in bending instead of pulling out of the matrix. Finite element analysis was used to determine the critical bending shear strength and MWNT modulus. The obtained bending shear strength was used in a mechanics model developed to provide bounds for the ISS in the experimental composite system. The calculated ISS for as-received nanotube falls between 4.8 and 13.7 MPa, and for surface treated nanotube falls in the range of 11.1 and 38.3 MPa. These values are consistent with the ISS reported for carbon fiber/polymer composites and also show that the ISS almost triples due to chemical modification of the MWNT surface. 相似文献
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采用银基活性钎料钎焊碳/碳复合材料 总被引:2,自引:2,他引:0
采用银基活性钎料(Ag-Cu-Ti)对二维层间增强型和三维正交增强型C/C复合材料进行了真空钎焊工艺试验,采用扫描电镜(SEM)观察了钎焊接头和连接界面的微观组织形貌,测定了各元素的面分布,对钎焊接头进行了室温压缩剪切性能试验和三点弯曲强度试验。结果表明:钎料中的元素Ti向钎料和C/C界面区扩散并富集,生成了含元素C的Ti2Cu化合物相,形成了钎料对C/C基体的良好润湿,可获得组织致密的接头,接头室温三点弯曲强度为:39MPa,抗剪强度为22MPa。 相似文献
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Yunxia GUO Jie LIU Jieying LIANG Department of Chemical Engineering North University of China Taiyuan China National Research Center of Carbon Fiber Engineering Technology Beijng University of Chemical Technology Beijing China 《材料科学技术学报》2005,21(3):371-375
Surface of polyacrylonitrile (PAN)-based carbon fibers was modified by electrochemical oxidation. The modification effect on carbon fibers surface was explored using atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Results showed that on the modified surface of carbon fibers, the carbon contents decreased by 9.7% and the oxygen and nitrogen contents increased by 53.8% and 7.5 times, respectively. The surface roughness and the hydroxyl and carbonyl contents also increased. The surface orientation index was reduced by 1.5% which decreased tensile strength of carbon fibers by 8.1%, and the microcrystalline dimension also decreased which increased the active sites of carbon fiber surface by 78%. The physical and chemical properties of carbon fibers surface were modified through the electrochemical oxidative method, which improved the cohesiveness between the fibers and resin matrix and increased the interlaminar shear strength (ILSS) of carbon fibers reinforc 相似文献
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阳极氧化对高聚物基碳纤维复合材料界面性能的影响 总被引:1,自引:0,他引:1
采用阳极氧化法对T-300高强度碳纤维和M-40高模量碳纤维进行了表面处理。发现该方法能剥除T-300碳纤维表面的高涂层,涂覆耐热涂层后可提高T-300/聚酰亚胺复合材料界面的抗热氧化性能,并且可使基体改性的珠M-40/酚醛环氧复合材料界面强度和冲击强度同时获得提高。 相似文献
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确定了一种碳/碳(简称C/C)复合材料飞机刹车盘再生利用新技术,通过对再生后样品力学性能测试和SEM分析表明其层间剪切强度比未再生前高,层间破坏未发生在粘接面上。研制出了与再生炭盘相匹配的防氧化涂层,实验表明这种涂层具有良好的氧化防护性能。地面动力模拟试验证明这种技术安全可靠,用其再生的炭盘满足飞机使用要求。 相似文献