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玻璃微珠增强硬质聚氨酯泡沫塑料的性能 总被引:2,自引:0,他引:2
研究了通过不同偶联剂处理后的不同玻璃微珠对全水发泡硬质聚氨酯泡沫的微观形貌、压缩强度和热稳定性的影响。试验结果表明,玻璃微珠的添加量占聚醚多元醇的6%(质量分数)以下时,玻璃微珠对泡孔形貌影响较小,并且应用偶联剂KH550处理后的玻璃微珠K46对聚氨酯泡沫的增强效果最好。在保持硬质聚氨酯泡沫密度不变的情况下,玻璃微珠K46含量为聚醚多元醇的6%时可提高压缩强度约10%,压缩模量约8%。同时,用玻璃微珠增强后的硬质聚氨酯泡沫热稳定性也有一定的提高。 相似文献
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为提高粒子增强体对聚氨酯泡沫的增强效率,将空心玻璃微珠及氧化石墨烯分别进行表面改性,并反应制备成协同增强体。该增强体可以借助空心玻璃微珠良好的分散性,带动表面接枝氧化石墨烯在机械搅拌下实现有效分散。实验表明,协同增强体中空心玻璃微珠与氧化石墨烯的比例满足阈值要求时,其对聚氨酯泡沫的压缩性能明显提升。其中,空心玻璃微珠与氧化石墨烯质量比为30∶1的协同增强体添加量为9.3份时,压缩性能提升最佳,压缩强度较未增强泡沫提高了30.5%,压缩模量提高了23.77%,优于单一增强体的增强效果。 相似文献
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本文以废玻璃粉为原料,CaCO_3为发泡剂,氧化铝纤维为增强剂,采用熔融发泡法制备泡沫玻璃。研究了发泡温度、发泡剂含量、纤维含量等因素对泡沫玻璃性能的影响。采用材料试验机、SEM、阿基米德法分析测试手段,对泡沫玻璃气泡结构、体积密度、气孔率以及抗压强度等进行了表征和分析。结果显示:随着氧化铝纤维含量的增加,泡沫玻璃的强度提高,气孔逐渐减小,均匀性变差。当氧化铝纤维含量为5%,发泡剂含量4%,烧结温度为820℃时,样品的平均抗压强度为3.5MPa、抗折强度为1.6MPa、气孔率为84%。 相似文献
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泡沫玻璃具有性能优良、环保节能的优点,本文结合国内外发展概况,介绍了泡沫玻璃在建筑节能领域的研究现状,探讨了泡沫玻璃在节能领域的发展趋势。 相似文献
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目前地铁长距离供冷的冷冻水管的保温材料有玻璃棉和泡沫玻璃两种,结合工程实际应用情况,对两种保温材料从系统投资、保温性能、使用年限等方面进行了比较,泡沫玻璃具有相对明显的经济技术优势,是一种值得推广的地铁冷冻水管保温材料. 相似文献
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制备了不同纤维质量分数的玻璃纤维-空心玻璃微珠/环氧树脂复合泡沫材料。通过三点弯曲试验研究了纤维质量分数对复合泡沫材料力学性能的影响。将复合泡沫材料试件置于蒸馏水和海水中浸泡,研究了浸泡腐蚀对试件弯曲性能的影响,并结合扫描电镜照片分析其原因。研究表明:纤维质量分数越高,玻璃纤维-空心玻璃微珠/环氧树脂复合泡沫材料的吸湿率越大,且在蒸馏水中的吸湿率较海水中的更大。试件的弯曲强度随纤维质量分数增加而增大,当纤维质量分数为10%时达到最大,比未添加纤维的试件增强了51%,之后则随纤维质量分数增加逐渐降低。浸泡腐蚀降低了试件的弯曲性能,其中海水浸泡后的试件弯曲性能最低。玻璃纤维-空心玻璃微珠/环氧树脂复合泡沫材料弯曲强度降低的直接原因是浸泡腐蚀使得部分玻璃微珠和玻璃纤维与环氧树脂基体间的界面层受到破坏。 相似文献
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Wondraczek L Mauro JC Eckert J Kühn U Horbach J Deubener J Rouxel T 《Advanced materials (Deerfield Beach, Fla.)》2011,23(39):4578-4586
The development of new glassy materials is key for addressing major global challenges in energy, medicine, and advanced communications systems. For example, thin, flexible, and large-area glass substrates will play an enabling role in the development of flexible displays, roll-to-roll processing of solar cells, next-generation touch-screen devices, and encapsulation of organic semiconductors. The main drawback of glass and its limitation for these applications is its brittle fracture behavior, especially in the presence of surface flaws, which can significantly reduce the practical strength of a glass product. Hence, the design of new ultrastrong glassy materials and strengthening techniques is of crucial importance. The main issues regarding glass strength are discussed, with an emphasis on the underlying microscopic mechanisms that are responsible for mechanical properties. The relationship among elastic properties and fracture behavior is also addressed, focusing on both oxide and metallic glasses. From a theoretical perspective, atomistic modeling of mechanical properties of glassy materials is considered. The topological origin of these properties is also discussed, including its relation to structural and chemical heterogeneities. Finally, comments are given on several toughening strategies for increasing the damage resistance of glass products. 相似文献
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低合金钢亚温淬火强韧化研究 总被引:8,自引:0,他引:8
借助扫描电镜,透射电镜,X射线衍射仪等对低合金钢27SiMn亚温淬火的强韧机理进行了研究。结果表明,位错强化,固溶强化,细晶强化及铁素体韧化等综合作用合金钢亚温淬火后强韧化效果较好。 相似文献
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Characterization of lead, barium and strontium leachability from foam glasses elaborated using waste cathode ray-tube glasses 总被引:1,自引:0,他引:1
Foam glass manufacture is a promising mode for re-using cathode ray tube (CRT) glasses. Nevertheless, because CRTs employ glasses containing heavy metals such as lead, barium and strontium, the leaching behaviour of foam glasses fabricated from CRTs must be understood. Using the AFNOR X 31-210 leaching assessment procedure, the degree of element inertization in foam glasses synthesized from waste CRT glasses (funnel and panel glasses, containing lead and barium/strontium respectively) were determined. The amount of leached lead from foam glasses prepared from funnel glass depends on the nature and concentration of the reducing agent. The effects of the reducing agents on the generation of cellular structure in the fabrication of foam glass were studied. The fraction of lead released from foam glass was less than those extracted from funnel glass and was lower than the statutory limit. Leached concentrations of barium and strontium were found to be approximately constant in various tests and were also below regulatory limits. 相似文献
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研究了TiCP粒径与TiCP/SiC复合材料的抗弯强度和断裂韧性之间的关系,探讨了低温冷处理对复合材料性能的影响.结果表明:添加适宜粒径的TiC颗粒能够提高SiC材料的强度和韧性,但同时提高强度和韧性的粒径范围很窄.对复合材料进行低温冷处理,不仅可以进一步提高强度和韧性,而且可以改变增韧的粒径范围,使增韧和增强的粒径重合范围变宽.因此,形成一个较宽范围的强韧化区,为材料的强韧化设计和工艺的制定提供了依据. 相似文献