Li5La3Nb2O12颗粒增强铝基复合材料阻尼性能的研究

Li5La3Nb2O12陶瓷颗粒作为添加剂并利用粉末冶金的方法制备金属铝基复合材料Li5La3Nb2O12/Al--80%,该复合材料在325K的温度下阻尼值可以达到0.011（测量频率为1.6Hz）,是同温度范围下金属铝阻尼性能的5倍左右,并且该复合材料在室温附近的阻尼性能均超过了0.008,使得其在工业科技方面有着十分广阔的应用前景。     

Two Sorts of Fiber Optic Sensor Monitoring the Cure Process of Composite Laminate

Two new sorts of fiber optic sensor are designed.Firstly, the variation of refractive index of resin surrounding the embedded fiber optic was mean to observed by measuring the speckle spatial spectrum at the end-face of the fiber optic.Secondly, it is proposed to measuring the change of thickness of the laminate by using fiber optic microbend attenuation.The experiment results measured by the fiber optic sensors are given.The first sort of sensor was found to be able to detect the viscosity process of the resin matrix during cure process includeing the minimum point of viscosity, the gelation point and the end point of cure process; the second sort of sensor could detect the course of change of the thickness of composite laminate pressed by operation pressure.It is benefit for us to optimize the operation technology and to establish the intelligent monitoring system about curing process of composites for the reason that the viscosity process and the change course of the thickness of laminate can be monitored.     

基于均匀化方法的颗粒增韧增强聚合物基复合材料有效性能预测

将数学上的均匀化方法与有限元法相结合,预测了颗粒增韧增强聚合物基复合材料的有效性能。利用编写的计算程序和ANSYS软件,具体地分析了颗粒尺度、颗粒形状、颗粒体积份数、颗粒与基体的模量比等参数对颗粒增韧增强聚合物基复合材料有效性能的影响.计算结果表明,对于刚性颗粒,有效弹性模量随着体积份数的增加而增加,随着模量比的增加而增加,同一模量比下方形颗粒有效弹性模量大于圆形颗粒;对于柔性颗粒,有效弹性模量随着体积份数的增加而减小,随着模量比的增加而增加,同一模量比下方形颗粒有效弹性模量大于圆形颗粒.均匀化方法用于预测颗粒增韧增强聚合物基复合材料有效性能是可行的     

SMA智能复合材料结构的弯曲振动方程

介绍了形状记忆合金智能复合材料结构的基本概念、结构类型、振动分析建模，并按照SMA纤维和基体的不同复合方式，详细总结了近年来关于形状记忆合金智能复合材料结构的弯曲振动方程．     

新型双马来酰亚胺树脂的合成及其碳纤维复合材料性能的研究

本文介绍了以N,N＇—亚甲基二对亚苯基双马来酰亚胺(BMI)与活泼亚甲基化合物——丙二腈、乙酰丙酮、乙酰乙酸乙酯和丙二酸二乙酯进行Michacl加成反应制成一类新型双马来酰亚胺树脂BMI—1～4。用于碳纤维复合材料的树脂是在BMI:活泼亚甲基化合物=1:0.7摩尔比下合成的,这种树脂的碳纤维复合材料具有较好的加工性、力学性能和热性能。     

复合材料在民用工业中的应用和发展

本文综述复合材料在国内外民用工业中的应用和发展动态，并对未来研究重点提出建议。     

SiCp／ZA-27复合材料SiC颗粒预处理工艺研究

对ＳｉＣ粒子进行子多种预处理工艺试验,得出ＳｉＣ粒了在９２０℃高温焙烧氧化,再在ＨＦ酸（１．５ｖｏｌ．）％）与丙酮混合液、丙酮中清洗球磨工艺是较优的预处理工艺。应用搅熔铸造工艺,处理后的ＳｉＣ颗粒能较易分散到含镁的ＺＡ－２７合金流中,用ＳＥＭ、ＥＤＳ、ＸＲＤ和ＴＥＭ测定和分析了预处理前后ＳｉＣ表面状态,得出ＳｉＣ颗粒表面物理,化学吸附的气体是阻止其分散进入ＺＡ－２７合金流的主要原因,ＳｉＣ表面的微     

Cu-(B4C)p metal matrix composites processed by accumulative roll-bonding

In this study, Cu/B4C metal matrix composites were prepared by accumulative roll-bonding (ARB). The microstructure of the processed samples was characterized by TEM, SEM and optical microscopy. The microhardness, uniaxial tensile and four-point probe tests were carried out to evaluate the mechanical properties and electrical resistivity of the ARBed monolithic and composite samples. The results showed that the reinforcement distribution was improved by increasing ARB cycles, which was quantitatively confirmed by some models. Based on TEM observations, the formation of an ultrafine grained structure in the composite matrix was also approved. It was shown that with increasing ARB cycles, the microhardness and tensile strength of the monolithic Cu samples were enhanced up to the 3rd cycle and then saturated, but the microhardness and tensile strength of the composites showed an increasing trend to the last cycle. Apart from a substantial improvement in the mechanical properties of the Cu/B4C composites, a minor decrement in electrical conductivity was detected after six ARB cycles.     

SiC/Al层状复合材料的弹道冲击动态响应

本文设计并制备了两种不同结构的多层SiC/Al合金复合材料,对其进行了弹道冲击测试。其中结构A为具有两层陶瓷板和一层金属内衬板;结构B为具有三层陶瓷板和两层金属内衬板。具有三层陶瓷板的结构B,相对于具有两层陶瓷板的结构A,在弹道冲击作用下,表现出较好的结构完整性。弹道冲击后,作用于结构A的弹体质量损失大,但是其长度损失小。对于结构B,单层陶瓷板厚度较小,但是对弹体的磨蚀作用强于结构A。陶瓷/金属层状复合材料作为一个整体,金属内衬板自身也吸收一部分冲击动能,从而导致了向后的变形,同时也产生阻力对断裂锥和弹体进行减速。此外,弹－靶结合瞬间产生巨大的热量,导致弹体发生部分熔蚀,也是弹体质量和长度损失的原因之一;同时金属内衬板也发生部分熔化。     

聚合物/碳纳米管复合材料的最新研究进展

综述了聚合物/碳纳米管复合材料的最近研究进展,介绍了聚合物/碳纳米管复合材料的制备方法以及存在的问题,特别强调了碳纳米管在聚合物基体中的分布情况对复合材料性能的影响;最后探讨了聚合物/碳纳米管复合材料进一步发展所面临的挑战。