共查询到19条相似文献,搜索用时 93 毫秒
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氮化硼(BN)纤维具有较高的强度,较低的密度,良好的耐高温氧化性能,良好的耐腐蚀性能,具有良好的透波性能等特点,在工程领域方面具有很好的应用前景。因而氮化硼纤维的研究成为新型陶瓷纤维领域的研究热点。氮化硼纤维具有较高的力学性能和抗高温氧化性能以及具有其他优秀的性能等而被广泛的应用在工程领域中。氮化硼纤维的制备工艺方法有无机前驱体转化法,静电纺丝法,有机前驱体转化法,硼酸和三聚氰胺化学反应合成法等。本文主要叙述氮化硼纤维的制备工艺方法,物相组成,显微结构,力学性能和其他的性能等。本文还叙述了氮化硼纤维的研究发展现状和发展趋势。最后本文对氮化硼纤维的未来研究发展趋势和发展方向进行分析和预测。 相似文献
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有机前驱体法制备氮化硼纤维的研究进展 总被引:1,自引:0,他引:1
氮化硼纤维作为正在发展中的一种重要的高性能无机纤维,具有优异的耐高温和透波性能。目前高性能氮化硼纤维的制备主要采用类似于碳纤维生产的有机前驱体转化法。介绍了国内外合成氮化硼纤维前驱体的各种合成方法以及各种合成产物制备氮化硼纤维路线的优缺点,并对氮化硼纤维研究的发展趋势进行了展望。 相似文献
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为得到尺寸可控、具有大比表面积的多孔氮化硼材料,以硼酸和三聚氰胺为原料采用前驱体高温裂解法制备了多孔氮化硼纳米纤维(BNNF)。通过改变前驱体合成方式得到不同尺寸的多孔BNNF材料,探究前驱体处理方式对产物结构和形貌的影响;通过选择合适的反应气氛实现BNNF的功能化,以期对BNNF表面性质进行调控。实验结果表明,所得多孔BNNF形貌均一、尺寸可控,纤维表面存在大量孔隙且最高比表面积达到1000 m^(2)/g以上;生长过程中的氨气与氩气的混合气氛可将BNNF功能化,成功将羟基和氨基引入BNNF表面。 相似文献
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陶瓷纤维多孔材料具有轻质、比强度高、导热低、耐热性能好等特点,因此广泛应用到航空航天,汽车制造,建筑材料等领域。陶瓷纤维多孔材料的传统制备方法有真空抽滤法,凝胶注模成型法,模压成型法等,而最近发展的新型制备技术-冰模板法(冷冻铸造法)由于能够精确控制多孔纤维材料微观结构而备受关注。重点综述了冰模板法制备陶瓷纤维多孔材料的研究现状,重点介绍了冷冻凝胶法、纤维自组装冷冻法和超声雾化冷冻法等冷冻铸造技术。 相似文献
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氮化硼具有独特的力学性能、化学稳定性、电性能和热稳定性,作为填料在制备聚合物基复合材料方面受到人们的高度重视。本文介绍了原位聚合法及共混法等氮化硼/聚合物复合材料的制备方法,并综述了氮化硼/聚合物复合材料在导热材料、屏蔽材料及其他方面的应用研究进展。 相似文献
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Sylvain Duperrier Rodica Chiriac Catherine Sigala Christel Gervais Samuel Bernard David Cornu Philippe Miele 《Journal of the European Ceramic Society》2009,29(5):851-855
The thermal behaviour of a series of poly[B-(methylamino)borazine] prepared at various temperatures ranging from 140 to 200 °C is studied in the present paper as potential BN fiber precursors. It was shown that the softening capability of poly[B-(methylamino)borazine] can be tailored by controlling the temperature at which polymers were prepared to achieve melt-spinning and produce high quality green fibers. Thus as-spun fibers could be next converted into boron nitride fibers using ammonia (25–1000 °C) and nitrogen (25–1800 °C) atmospheres. The quality of boron nitride fibers was shown to depend on the first part of the pyrolysis step (25 and 1000 °C; ammonia atmosphere) in which the great majority of the weight loss necessary for boron nitride production occurs. Ideal poly[B-(methylamino)borazine] as BN fiber precursors are those prepared between 170 and 180 °C. They display appropriate melt-spinnability and ceramic conversion capability. 相似文献
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Pascaline Toutois Philippe Miele Sylvain Jacques David Cornu Samuel Bernard 《Journal of the American Ceramic Society》2006,89(1):42-49
A series of boron nitride fibers were prepared by varying the tension applied on a same lot of poly(methylamino)borazine fibers during their pyrolytic conversion at 1800°C. Their microstructure/microtexture was studied by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy investigations. Such analyses showed that ceramic fibers presented good crystallinity, but crystallites oriented along the fiber axis with fiber stress. It is most interesting that stretching was essentially effective during the pyrolysis to 1000°C, preventing fiber crimping, and decreasing the fiber diameter. Therefore, the fiber strength increased, while the fiber modulus also increased because of an improvement of the basal layer orientation along the fiber axis. 相似文献
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Leon Maya 《Journal of the American Ceramic Society》1990,73(9):2714-2719
The feasibility of producing derivatized preformed polymers to be used as ceramic precursors was explored. A borane derivative of polyethyleneimine (PEI) was prepared through a transamination reaction involving Me3 NBH3 . Higher boron loadings were possible with Me3 NB3 H7 . The borane derivative could be cast into films and produced boron nitride upon pyrolysis. Similarly, polyethyleneimine hydrochloride was converted into the cyanohydroborate derivative through a reaction with NaBH3 CN. This derivative was also accessible through a transamination reaction. Both materials produced boron nitride upon pyrolysis. Polyallylamine hydrochloride could not be derivatized. Silyl derivatives of PEI were also prepared, but the products obtained afforded low ceramic yields upon pyrolysis. 相似文献
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《Ceramics International》2020,46(13):20717-20723
High crystalline hexagonal boron nitride nanoplates with high aspect ratio of ~400 have been synthesized by combustion synthesis method through magnesiothermic reduction reaction between B2O3 and Mg in N2 pressure. The synthesized hexagonal boron nitride nanoplates were about 50 nm in thickness and larger than 20 μm in lateral size. The six-fold symmetric spots electron diffraction pattern of transmission electron microscopy shows that the nanoplate is well crystallized. Hexagonal boron nitride nanoplates grow via an Oswald ripening process and have larger lateral size when it was prepared with larger magnesium particles. High temperature liquid magnesium provides an important environment for the growth and crystallization of boron nitride. This work provides an effective way to achieve low-cost and large-scale preparation of high-quality boron nitride nanoplates. 相似文献
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