共查询到17条相似文献,搜索用时 62 毫秒
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随着化石燃料的不断使用,CO2的排放量显著上升,从而严重影响了当今生态环境,为了减少CO2的排放,利用新能源代替化石燃料迫在眉睫。氢能源具有高热值、CO2零排放的优点,是化石燃料的良好替代品,但是其密度小、沸点低导致其储存难度大,从而限制了其大规模应用。现阶段氢能源采用高压储氢罐进行储存,存在储氢容量低、运输成本高以及氢脆现象等缺点。新型储氢材料和技术的开发是氢能源大规模商业应用的关键。空心玻璃微球(Hollow Glass Microspheres, HGMs)作为一种中空小尺寸耐压材料,具有良好的稳定性、储氢容量大、成本低、无氢脆等优点,在储氢方面有着巨大的潜力。对空心玻璃微球储氢的进展进行综述,介绍空心玻璃微球储氢机理、影响因素等,并进一步重点介绍了氢气释放速率以及响应时间的研究。 相似文献
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空心玻璃微球具有低比重、高耐热性、低导热率、低导电率、耐化学侵蚀和耐燃性。它与液态树脂或橡胶混合后,能制造出多种轻质密封剂或胶粘剂,例如防火墙密封剂、绝热胶粘剂、可磨损材料、吸音材料、低介电常数和低电损耗的绝缘灌注料等,均可广泛应用于航空和宇航系统的材料。 相似文献
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本文详细地讨论了空心玻璃微球填料对聚丙烯酸酯/环氧树脂(PA/EP)IPN体系阻尼性能的影响。结果表明,根据IPN的组分配比,微球填料型号以及添加量的差异而表现出不同的作用效果,并为此讨论了结构与性能的关系。 相似文献
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本文较系统地研究了一种超细玻珠的化学成份,矿物组成,谱学特性及表面电性等,并简介了无机-无机-无机-无机-有机复合玻璃微球的研制。 相似文献
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以空心玻璃微球(HGM)填充环氧树脂制备了密度为0.56~0.91 g/cm3的HGM/环氧复合泡沫塑料。研究了HGM含量对复合泡沫塑料黏度、力学性能、动态力学性能及隔热性能的影响。结果表明:表面偶联处理后增加了HGM的表面亲油性,改善了其与基体树脂间的相容性和界面性能,有利于HGM/环氧复合泡沫塑料性能的提高;体系黏度与HGM含量呈正相关,与温度呈负相关;随着HGM含量的增加,HGM/环氧复合泡沫塑料的压缩强度、弯曲强度和拉伸强度均有一定程度的降低,但是比强度变化不大,材料得到很大程度的轻质化;HGM的引入使得HGM/环氧复合泡沫塑料玻璃化转变温度向低温方向偏移,储能模量呈现先减小后增加的趋势,导热系数由纯环氧树脂的0.203 W/(m·K)减小到HGM含量为40wt%时的0.126 W/(m·K)。HGM/环氧复合泡沫塑料阻尼性能和隔热性能均有所提高。 相似文献
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空心玻璃微珠填充固体浮力材料的制备及性能研究 总被引:1,自引:0,他引:1
以双酚A环氧树脂E51为基质原料,甲基四氢苯酐为固化剂,K25空心玻璃微珠为轻质填充物,采用模压成形的方法制备了空心玻璃微珠填充固体浮力材料。研究了玻璃微珠的填充率对体系粘度、浮力材料的密度、抗压强度及耐静水压件能的影响。结果表明,低密度空心微珠的引入,有效降低了固体浮力材料的密度,并且随着玻璃微珠填充量的增大,材料的理论计算密度与实际密度的偏差逐渐变大;浮力材料的单轴压缩强度和耐静水压强度随着空心玻璃微珠填充量的增大而降低,当玻璃微珠填充量超过18%时,材料性能下降幅度增大。 相似文献
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Abstract: This article presents the results obtained in a current study of the viscous properties on hybrid short fibre/hollow glass microspheres composites fabricated with epoxy binder. The effect of the filler volume fraction and of the fibre reinforcement on the dynamic stiffness modulus, damping coefficient and glass transition temperature was studied. These properties were determined using dynamic mechanical analysis (DMA) in three points bending mode. The specimens were cut from plates produced by vacuum resin transfer moulding with microspheres weight contents up to 17%. Net resin exhibits storage modulus significantly higher than the 2% in weight of microspheres foam, while negligible effect was observed on the maximum loss modulus, maximum damping coefficient and glass transition temperature. The increase in filler volume fraction tends to decrease significantly storage and loss modulus at stable regions and the maximum damping coefficient, while glass transition temperature is only marginally affected. The addition of low contents of short fibre increases significantly storage modulus, particularly for carbon fibre, while maximum loss modulus does not exhibit a well‐defined tendency. Important reduction in the maximum damping coefficient was observed by the addition of both fibre reinforcements. 相似文献
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Abstract: Low-density sheet-moulding compounds based on hollow glass micro-spheres are usually classified as syntactic foams if the filler content is relatively high. Syntactic foams are potentially suitable materials for applications where impact loads occur as they are able to reduce impact force. The addition of hollow micro-spheres tends to increase the specific values in terms of impact force and, marginally, in flexural modulus for high-volume fractions of micro-spheres. In this study, the effects of load rate and of immersion of the specimens in water up to 67 days were studied on the flexural mechanical properties and particularly on the fracture toughness, K IC . Hollow micro-spheres (Verre ScotchitTM-K20) with epoxy and polyester polymer binder were used. Fracture toughness, K IC , flexural stiffness modulus and ultimate strength were obtained as functions of load rate and immersion time. The increase of load rate tends to increase stiffness modulus, but effects on K IC were found to be only marginal. Ultimate strength increases significantly with the increase of load rate for epoxy-based composites, but for the case of the polyester-based foams, only a negligible effect was observed. The increase of the immersion time in water tends to reduce stiffness modulus. K IC decreases slightly after 15 days for the polyester-based composites and after 67 days for epoxy-based foams, and only negligible effects on ultimate strength were observed. 相似文献
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本文主要综述了空心玻璃微珠表面镀膜的类型及镀膜方法,经表面包覆改性可提高空心玻璃微珠的性能或使其具有新的性能,拓宽了其应用领域,同时也探讨了空心玻璃微珠表面包覆改性及其应用的发展趋势。 相似文献
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研究了微波辐射改性废胶粉(WRP)、偶联剂改性空心玻璃微珠(HGM)对环氧树脂复合材料的结构和性能的影响.采用差示扫描量热、热重分析等方法进行测试和表征,用扫描电镜观察了复合材料的断面形态.结果表明,少量合适粒径的改性WRP可以提高环氧树脂复合材料的冲击强度,适量的改性HGM可以提高复合材料的T<,g>和弯曲强度,并改... 相似文献