排序方式: 共有9条查询结果,搜索用时 15 毫秒
1
1.
Epocast 50-A1/946 epoxy was primarily developed for joining and repairing of composite aircraft structural components. The objective of the present work is to modify the Epocast epoxy resin by different nanofillers infusion. The used nanofillers include multi-walled carbon nanotubes(MWCNTs), SiC and Al2O3 nanoparticles. The nanofillers with different weight percentages are ultrasonically dispersed in the epoxy resin. The sonication time and amplitude for MWCNTs are reduced compared to Al2O3 and SiC nanoparticles to avoid the damage of MWCNTs during sonication processes. The fabricated neat epoxy and twelve nanocomposite panels were characterized via standard tension and in-plane shear tests. The experimental results show that the nanocomposites materials with 0.5wt% MWCNTs, 1.5wt% SiC and 1.5wt% Al2O3 nanoparticles have the highest improvement in the tensile properties compared to the other nanofiller loading percentages.The improvements in the shear properties of these nanocomposite materials were respectively equal to 5.5%, 4.9%, and 6.3% for shear strengths, and 10.3%, 16.0%, and 8.1% for shear moduli. The optimum nanofiller loading percentages will be used in the following papers concerning their effect on the bonded joints/repairs of carbon fiber reinforced composites. 相似文献
2.
3.
张万强%杨鸿昌%裴雨辰%赵英民 《宇航材料工艺》2006,36(3):26-28
为了提高环氧复合泡沫塑料(ESF)的性能,扩大应用范围,采用超声波和高剪切分散工艺制备了纳米SiO2改性ESF。结果表明:纳米SiO2的添加量质量分数为3%时,改性效果最好,其拉伸强度、弯曲强度和不加纳米粒子的ESF相比,分别提高了41%、19%;采用扫描电镜(SEM)对材料的断口形貌进行了观察,从微观结构上研究了纳米SiO2的加入对ESF性能的影响;对材料的介电性能测试表明,纳米SiO2粒子的加入对ESF的高频介电性能影响不显著;动态力学分析(DMA)研究表明纳米SiO2粒子质量分数为1%时,ESF的Tg提高了4℃。 相似文献
4.
5.
A study on the resistance performance of epoxy nano-composites under the vacuum ultraviolet irradiation 总被引:2,自引:0,他引:2
Irradiation damage effects of the epoxy resin 648 and epoxy nano-composites are studied by means of simulating the vacuum ultraviolet (VUV) irradiation whose wavelength ranges from 5 to 200 nm. Experimental results of the mass loss, SEM and XPS show that nano-TiO2 particles exhibit better resistance performance under VUV. Comparing with epoxy resin, the epoxy nano-composite brings significantly less mass loss, slighter flexural strength variation and decreasing gas extraction with less gas component varieties after irradiation. What is more, no new carbon peak-value has been found and principle components of Ols peak-value remain unchanged on the surface. 相似文献
6.
《中国航空学报》2023,36(1):413-422
A series of non-covalently functionalized molybdenum disulfide-silica (f-MoS2-SiO2) nanocomposites was prepared by an in-situ assembled method and used to fabricate the oriented molybdenum disulfide-SiO2/Hydrogenated Nitrile Butadiene Rubber (f-MoS2-SiO2/HNBR) composites. The characterization results show the synergistic dispersion between the functionalized molybdenum disulfide (f-MoS2) nanosheets and SiO2 nanoparticles. The addition of f-MoS2 nanosheets can improve the dispersion of fillers in the rubber matrix and weaken the filler network. The non-covalently functionalization improves the interface interaction between f-MoS2 nanosheets and the rubber matrix. Furthermore, the tensile strength of f-MoS2-SiO2/HNBR is 65.9% higher than that of SiO2/HNBR by adding 1.0wt% of f-MoS2. At the same time, the dielectric constant of f-MoS2-SiO2/HNBR is increased by 23.7% compared to SiO2/HNBR due to the micro-capacitor structure of parallel f-MoS2 nanosheets in the rubber matrix. Our work provides new ideas for the development of high-performance elastomer materials. 相似文献
7.
文章综述了国内外纳米材料(如碳纳米管,SiO2,TiO2)在航天器上的潜在应用。首先介绍了在航天器领域具有应用潜力的纳米材料及其复合材料,然后从结构和功能材料等方面对在航天光学遥感器上的应用前景做了分析。 相似文献
8.
9.
《中国航空学报》2022,35(11):155-177
Smart sensors are becoming one of the necessities for connecting and detecting surrounding stimuli with tremendous convenience, especially when exploiting a single powerful sensor with multifunctionality. To successfully accomplish the design of a self-powered sensor, serving power is becoming a critical issue because of its continuously consumed energy required by electronics. A variety of nanogenerators aiming for the rational design of self-powered system are reviewed and compared, followed by their recent advances with polymer nanocomposites for self-powered sensors. More importantly, the proposed conceptual design of a self-powered unit/device with triboelectric nanogenerator has been emphasized to eventually realize the practical activities towards multiple detections and human–machine interaction. Finally, challenges and new prospects of rational design of self-powered polymer composite sensors in achieving human–machine interaction/interface are discussed. 相似文献
1