SiC-MoSi2-TiSi2涂层的设计及热力学分析

为了提高C/C复合材料的高温抗氧化性能,设计了网状的SiC填充高性能的MoSi2和微量的TiSi2涂层,对制备涂层的化学形成机理进行了热力学分析.结果表明,在选择的实验条件下,制备设计的涂层是完全可行的,实验制备的涂层在1773K有氧环境下具有良好的抗氧化性能.     

碳纤维增强陶瓷基复合材料抗氧化技术研究

碳纤维增强陶瓷基复合材料(CFRCMCs)具有良好的高温力学性能和热性能,是航空航天领域非常理想的热结构材料.但CFRCMCs中的碳纤维极易发生氧化,因此CFRCMCs的氧化防护问题一直是CFRCMCs研究的热点.文章对碳纤维改性、基体抗氧化技术、界面层抗氧化技术和表面涂层技术这四种CFRCMCs的抗氧化技术及其原理进行了评述,分析了各类抗氧化技术的特点并对其发展趋势进行了展望.     

一种用于环氧树脂固化监测的自参考型光纤折射率传感器

研究了一种用于定量监测环氧树脂固化度的自参考型的光纤折射率传感器.该传感器用于环氧树脂基复合材料的固化监测时,埋设于复合材料结构内不同部位的传感器能够自参考地定标,使得传感器的输出能够进行实时的比较,从而反映复合材料内部不同部位的固化程度之间的差异.用该传感器对环氧树脂的恒温固化过程进行了监测,测量结果与差示扫描量热法的测量结果进行了对比,验证了该传感器的自参考功能.,A self-referenced fiber-optic refractive index sensor is developed to measure quantitative cure extent of epoxy. In case the sensor is applied to in-situ cure monitoring of epoxy composites, each sensor embedded in different location within the structure is self-referenced and can be normalized to a common scale. Therefore, the real-time comparative of each sensor's output becomes possible and variations in the extent of cure at different locations can be monitored. The developed sensor was used to monitor the isothermal cure of an epoxy system. The output of the sensor was compared with the results of the differential scanning calorimetry (DSC). The self-referencing function of the sensor is confirmed.     

聚丙烯纤维与钢纤维混杂增强水泥基复合材料的断裂性能(英文)

本文讨论了聚丙烯纤维与３ 种尺寸的钢纤维混杂增强水泥基复合材料,总纤维体积率在０－４％ ～０－９５ ％ 范围内．采用带预制裂纹的、尺寸为１００ ｍｍ ×１００ ｍｍ ×５００ ｍｍ 的棱柱体四点弯曲试验,研究混杂纤维的阻裂效果．研究结果表明,在小变形范围内,聚丙烯纤维与钢纤维对于提高承载能力具有协同效应,但该效应随着变形的增加而消失．尺寸大、弹性模量高的钢纤维相对于尺寸小的钢纤维或弹性模量低的聚丙烯纤维而言,对于提高水泥基复合材料的能量吸收能力具有更好的效果．研究表明,荷载———裂纹张开位移曲线呈现“宽峰”或“多峰”形式时,复合材料静态使用条件的确定必须综合考虑材料的极限荷载及相应的裂缝宽度．     

纳米复合材料进展概况

本文简要介绍了纳米技术在结构陶瓷材料, 催化材料、无机/ 有机复合材料和碳纳米管复合材料等方面的研究和应用进展概况.     

聚丙烯／纳米CaCO3复合材料的制备及力学性能研究

采用挤出造粒和注射成型的方法制备聚丙烯／纳米CaCO3复合材料试样条,测试了样条的力学性能,分析和研究了纳米CaCO3粒子的含量对复合材料力学性能的影响。实验结果表明,复合材料的力学性能随着纳米CaCO3含量的增加呈现先升后降的趋势。当纳米CaCO3质量分数达6％左右时复合材料的力学性能较好,超过6％后力学性能开始下降。     

Preparation of the polysulfonamide/titania composites

A series of polysulfonamide （PSA）/TiO 2 modifier nano-composite films were successfully prepared by in-situ polymerization at a low temperature based on 4, 4-diaminodiphenylsulfone and terephthaloyl chloride in the common solvent N, N-dimethylacetamide （DMAc）. It was shown that the nano particles were well dispersed in the polymer substrate. Mean-while, PSA/TiO 2 /modifier composites exhibited good UV-resistant properties and mechanical properties. In addition, the composites’ heat stability improved. These prepared composites are promising in preparing spinning solution and might have potential application in heat-resistant fiber.     

金属基复合材料在汽车工业上的应用

介绍了金属基复合材料的制备与性能及金属基复合材料在汽车上的应用。     

导电高分子材料在电磁屏蔽的效能分析

导电高分子材料在电磁屏蔽领域有着广阔的应用前景．按结构及制备方法不同，可将导电高分子材料分为本征型与复合型两大类．导电填料高分子基体和复合工艺是影响导电高分子材料电磁效能的重要因素．     

Unorthodox thoughts on the nature and mission of contemporary educational psychology

Two commonly held assumptions are questioned—that mental states and processes are to be studied in isolation, and that individuals' psychology can be studied out of social and cultural context. The view presented here is that of an educational psychology focusing on the study and design of complex and contextualized composites, making it analogous to architecture and aerospace science, fields that deal with composites and whose units of analysis reflect rather than reduce the complexity of the phenomena they study and design. Design and study of learning environments are argued to serve as the apex of the field's scholarly activities. Guttman's Small Space Analysis is offered as a useful tool for such activities.