不同工艺方法制备的Cu／AI2O3复合材料的组织与性能

比较了用两种不同工艺方法制备的金属氧化物增强铜基复合材料的组织和性能，分析了工艺方法对复合材料组织和性能的影响机理，提出了不同工艺条件下复合材料质量控制方法。     

TiB2/Al复合材料的组织性能研究进展

TiB2/Al复合材料是一种很有潜力的复合材料,在耐磨、航空航天等领域有着广阔的应用前景.复合材料的性能除了取决于基体和增强体外,还与制备材料所用的工艺有关.综述了采用不同工艺制备的TiB2/Al复合材料的显微组织、力学性能和摩擦磨损性能,详细介绍了采用不同工艺制备出的TiB2/Al复合材料组织性能的特点,并展望了其研究趋势.     

液-固两相区压缩变形对SiCw/6061Al复合材料组织和性能的影响

研究了液固两相区压缩变形对SiC_w/6061A l 复合材料组织和性能的影响。结果表明, 压缩变形温度对变形后复合材料中晶须长径比、取向, 复合材料组织的致密性、均匀性和界面结合状态均有不同程度的影响。复合材料组织的变化又影响到复合材料的性能。复合材料高温大变形后性能的变化是评价复合材料高温塑性成形加工工艺的最重要指标。通过分析复合材料的组织和性能, 从而确定了复合材料最佳压缩变形工艺。     

液-固两相区压缩变形速率对SiCw/6061Al复合材料组织和性能的影响

研究了液固两相区压缩变形对ＳｉＣｗ／６０６１Ａｌ复合材料组织和性能的影响。结果表明,压缩变形速率对变表后复合材料中晶须长径比、取向,复合材料组织的均匀性和界面结合状态均有不同程度的影响,进而又影响到复合材料的性能。通过分析复合材料高温大变形后的组织和性能确定了复合材料最佳压缩变形工艺。     

非连续体增强铝基复合材料热机械处理工艺与性能研究

研究了不同工艺参数对粉末冶金法制造的非连续体增强铝基复合材料性能的影响规律，发现热挤压可大大改善复合材料的组织与性能。复合材料的最佳热处理工艺也与单一合金材料有很大不同。分析了影响复合材料基体时效力学的主要因素。     

碳纳米管增强铜基复合材料性能研究

采用球磨混料工艺,真空热压法烧结方法制备了碳纳米管/Cu复合材料,研究了该纳米复合材料组织与性能之间的关系,分析碳纳米管对Cu基复合材料组织和性能的影响规律。结果表明:随着复合材料碳纳米管含量的增加,复合材料的孔隙增多,复合材料的硬度和相对密度逐渐下降。     

原位自生Ti-B-Si-C系复合材料的制备和性能

以Ti粉、B4C粉和SiC粉为原料,用真空热压烧结工艺制备了原位自生颗粒增强的Ti-B-Si-C系钛基复合材料,研究了复合材料的显微组织和力学性能。结果表明,使用的初始粉末不同,原位自生颗粒的组成不同,复合材料的性能也有明显的差别。     

浸渗铸造纤维增强金属基复合材料及界面反应

讨论了纤维增强金属基复合材料的浸渗铸造，重点从浸渗机理与工艺方法的关系角度讨论了浸渗工艺类型及对复合材料组织性能的影响，并对常用的碳及氧化铝纤维增强复合材料结构相（其中包括纤维本身结构的纳米组元及反应产物中的新生相）进行了讨论，由于反应相的形成条件。形成区域不同，对复合材料性能的影响也不同，另外还讨论了其它组元如SiO2对反应相形成的作用。     

不同陶瓷颗粒增强Cu基复合材料的制备及导电性能

以纯铜为基体,以WC、AlN、TiN、MgB2等具有不同导电性能与密度的陶瓷颗粒为增强相,采用球磨-冷压-烧结工艺制备了WCp/Cu、AlNp/Cu、TiNp/Cu和MgB2p/Cu系列复合材料.研究了制备工艺的不同环节对铜基复合材料导电性能的影响,讨论了不同陶瓷颗粒增强铜基复合材料的导电性能.结果表明相同制备工艺及体积分数条件下,以具有不同导电性能与密度的陶瓷颗粒作为增强相的铜基复合材料的导电性能相近,球磨、冷压、烧结、复压及复烧等工艺环节对铜基复合材料导电性能有不同程度的影响,提高铜基复合材料的致密度为提高其导电性能的关键.     

金刚石/碳化硅复合材料的研究进展

金刚石/碳化硅复合材料综合了碳化硅与金刚石的优点，具有高热导率、低热膨胀系数、高比刚度、高硬度以及耐磨损等优异性能，具有广阔的应用前景，是陶瓷基复合材料领域研究的重点之一。金刚石/碳化硅复合材料的制备最早采用高温高压法，该方法可以有效避免金刚石颗粒石墨化带来的有害影响。随着技术的不断发展，出现了多种制备方法。不同的制备工艺下，金刚石/碳化硅复合材料内部的主要相含量、界面相结构及微观组织等因素决定了复合材料的整体性能水平。本文综述了国内外金刚石/碳化硅复合材料的研究与发展现状，从制备方法、性能特点、微观组织及界面反应机制等方面进行了阐述，分析了当前金刚石/碳化硅复合材料研究存在的问题，并对该复合材料的未来发展方向进行了展望。     

Effect of fabrication process on the microstructure and dynamic compressive properties of SiCp/Al composites fabricated by spark plasma sintering

The effect of fabrication process on the microstructure and dynamic properties of SiC_p/Al composites was studied in this paper. Pure Al matrix composites reinforced with 20 vol.% SiC particles were fabricated by spark plasma sintering, and the pre-blended powders were prepared by two different processes. One was to mix the powders in conical flask by using a mechanical stirrer, and the other was the mechanical alloying process by using a planetary ball mill. The sintering temperature was also explored. The conventional split Hopkinson pressure bar was used to test the dynamic properties of these composites. The results show that the sintering temperature significantly affects the consolidation of the composites. The composites, which have not been fully densified, have very loose microstructure and poor mechanical properties. Mechanical alloying process can improve the microstructure and mechanical properties of the composites. These composites are rate dependent, their strengths increase with increasing strain rates.     

感应烧结Fe-Cu-Al-石墨复合材料的力学性能和摩擦学性能

为了进一步提高材料的力学性能和摩擦学性能,以感应加热烧结的方法,制备了Fe-Cu-Al-石墨复合材料。利用XRD,EDS,SEM等分析了复合材料的组成、结构、表面形貌;研究了其力学性能、摩擦学性能及磨损机理。结果表明：Fe-Cu-A1-石墨复合材料具有多孔结构;随着石墨含量的增加,复合材料的力学性能降低,摩擦学性能提高...     

球磨工艺对原位合成碳纳米管增强铝基复合材料微观组织和力学性能的影响

将原位化学气相沉积法合成的碳纳米管(CNTs)与铝的复合粉末进行球磨混合,进而粉末冶金制备CNTs/Al复合材料,研究球磨工艺对复合材料的微观组织和力学性能的影响。结果表明:球磨过程中不添加过程控制剂所得到的复合材料力学性能优异;随着球磨时间的增加,CNTs逐步分散嵌入铝基体内部,复合材料的组织也变得更加致密均匀。CNTs/Al复合材料的硬度和抗拉强度均随球磨时间的延长持续增加,但是伸长率先增后减。经90min球磨的CNTs/Al复合材料展现了强韧兼备的特点,其硬度和抗拉强度较原始纯铝提高了1.4倍和1.7倍,并且具有17.9%的高伸长率。     

高摩擦学性能碳／碳复合材料研制

探索了高摩热学性能碳／碳（Ｃ／Ｃ）复合材料的制备途径，设计出了高摩擦学性能Ｃ／Ｃ材料的组织模型，并按模型制备出了在碳纤维上分布着球状沉积碳组织的Ｃ／Ｃ材料，实验表明：这种Ｃ／Ｃ材料具有良好的摩擦磨损性能，刹车力矩和速度的关系曲线平稳，初始力矩峰值小，摩擦系数适中；磨损率小，摩擦面光滑；试样无分层、碎裂、掉块等失效情况。     

Effect of flax fibres individualisation on tensile failure of flax/epoxy unidirectional composite

The study of plant fibres composites is a widespread research topic; nevertheless, the reinforcement mechanism understanding of these materials must be still improved. The paper presents a study of the effect of the mechanical properties, the dispersion and the fibre/matrix interface property of elementary fibres on the tensile properties of unidirectional composites. Our work shows that the mechanical performances of unidirectional composites could be linked to those of the elementary fibres as well as to the composites microstructure. Flax fibres individualisation, linked to the homogeneity of the microstructure, is highly dependent on the fibre extraction process. The importance of the composites homogeneity has been confirmed by the Rosen model, which could be used thanks to interfacial shear strength measurements.     

Synthesis of A356 Al–high-Ca fly ash composites by pressure infiltration technique and their characterization

Eight types of A356 Al–fly ash composites were produced by pressure infiltration of high-Ca lignite fly ash. This type of ash was used for the first time in Al-composites synthesis, and particularly by liquid metal infiltration techniques. After examining mineralogy and chemistry, specific, narrow ash size fractions were used for the synthesis of composites, and properties linked to microstructure and wear strength of the materials. The effect of using ground ash particles on the microstructure and tribological performance of the composites was also investigated. It was concluded that using fine, high-Ca ash particles can improve the properties of composites, and that using ash particles in a ground form can better facilitate the production process of MMCs.     

纤维独石陶瓷复合材料的研究进展

纤维独石陶瓷复合材料是一种新型的陶瓷材料,具有独特的三维微结构排列和力学性能,尤其是高韧性,在结构陶瓷方面具有潜在的应用前景。本文总结了国内外纤维独石结构陶瓷基复合材料的制备工艺、组成与结构及性能,提出了仍需研究的问题。     

Effects of processing methods and parameters on the mechanical properties and microstructure of carbon/carbon composites

The influence of the fabrication parameters during carbonization and densification processes on the mechanical properties and the microstructure of carbon/carbon (C/C) composites were investigated. The C/C composites were made by using phenolic resin as precursor and two-dimensional carbon fabrics as reinforcements for the first carbonization. The effects of heating rate and heat-treatment temperature during the initial carbonization process on the properties of C/C composites are presented. Further densification treatment was completed by chemical vapour infiltration (CVI) and a liquid-resin impregnation process. The CVI route was found to be more efficient than the resin-impregnation process. The interlayer spacing of C/C composites did not change after resin re-impregnation for several times. However, the interlayer spacing of the C/C composites was reduced when the processing temperature in the CVI process was increased. Higher flexural strength and flexural modulus were obtained because the densities of the composites were enhanced either by the chemical vapour infiltration process or by the resin-impregnation route. The variation in thickness of the CVI deposited carbon within the preformed composite was studied and the morphology of the fracture surface of the C/C composites was also examined.     

MoSi2-SiC 抗氧化涂层对碳/碳复合材料弯曲性能的影响

在C/C 复合材料表面制备了MoSi₂-SiC 抗氧化涂层, 分析了涂层工艺对C/C 复合材料组织的影响, 测试了材料的室温弯曲力学性能。结果表明, 该工艺在C/C 复合材料表面生成抗氧化涂层的同时, 基材内部的层间和纤维束界面, 以及孔隙周围也被硅化。C/C 复合材料经涂层工艺处理后, 弯曲断裂行为发生改变, 弯曲强度明显升高,塑性有一定程度的降低。