共查询到20条相似文献,搜索用时 109 毫秒
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金属纳米块体材料制备加工技术和应用 总被引:6,自引:0,他引:6
综述了国内外块状纳米材料的制备技术进展及存在的问题,提出了超短时脉冲电流直接晶化法和深过冷直接晶化法两类潜在的块状金属纳米晶制备技术,并对今后的研究及发展前景进行了展望。同时对大块纳米材料的性能特点及应用前景做了展望。 相似文献
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脉冲电沉积法制备纳米材料的研究进展 总被引:1,自引:0,他引:1
纳米材料具有特殊的磁性、光学、力学、电学、电化学催化等性能,而脉冲电沉积技术在制备纳米材料方面应用广泛且优点多.着重列举了脉冲电沉积技术在制备纳米晶材料、纳米复合材料、纳米析氢材料、纳米金属薄膜及纳米金属多层膜、纳米线材料等方面的应用,总结了纳米材料的一些特点,展望了脉冲电沉积技术制备纳米材料的前景. 相似文献
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准一维氧化物纳米材料因其独特的光学性能、电学性能及几何结构而成为当前纳米材料研究领域的热点和重点.论述了直接氧化法制备准一维氧化物纳米材料原理,着重介绍了这一方法在准一维氧化物纳米材料制备中的应用,并对其前景作了简要的展望. 相似文献
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《功能材料》2021,52(5)
光催化纳米材料是指能直接将太阳能转化为化学能来进行催化的纳米材料。因能直接利用太阳能这一特性,光催化纳米材料成为了缓解能源短缺和环境污染最有潜力的一类材料。光催化纳米材料的制备方法多种多样,其中,微生物制备法是利用微生物生长代谢合成光催化纳米材料,因微生物生长周期短、反应条件简单、无二次污染、节能环保等优点,成为现今极具发展潜力的、绿色环保的制备方法。对此研究者们进行了大量的研究探索。结合了近十年来有关微生物法制备光催化纳米材料的研究文献,介绍了用微生物法合成的各种纳米光催化材料,包括金属单质、硫族金属化合物、金属氧化物、复合材料及其它。重点阐述了光催化纳米材料的微生物制备过程及机理,介绍了各种光催化纳米材料的应用及光催化机理,最后,对光催化技术和微生物制备未来的研究进行了展望。 相似文献
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对ZnO一维纳米材料制备技术的研究进展作了综述,根据制备过程的相态将制备方法分为液相法、固相法和气相法。对各制备方法的特点进行了归纳总结和评述,对ZnO一维纳米材料的发展趋势做了展望,也介绍了本课题组的工作。 相似文献
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晶化法制备的纳米晶材料的研究现状 总被引:4,自引:2,他引:2
介绍了非晶合金晶化法制备纳米晶材料的各种工艺过程和特点,综述了该法的影响因素、机理等方面的现今研究成果,对该法的发展及应用前景作了展望。 相似文献
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介绍了BN纳米材料的研究进展、纳米材料的结构和制备技术发展状况,详细阐述了电孤放电、激光烧蚀、机械球磨、碳热法和化学反应法等多种制备方法,并展望了BN纳米材料的发展前景. 相似文献
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《功能材料信息》2007,(5)
A number of techniques have been developed to synthesize nanocrystalline bulk materials,including inert-gas condensation and consolidation,electrodeposition,severe plastic deformation,crystallization of amorphous solid,surface mechanical attrition,and powder metallurgy.However,it is hard to produce the bulk with controllable nanostructures,especially with the grain sizes controllable in a wide range below 100 nm.In the conventional powder metallurgy,due to the fact that rapid coarsening of the particles ... 相似文献
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Structural nanocrystalline materials: an overview 总被引:1,自引:0,他引:1
Carl C. Koch 《Journal of Materials Science》2007,42(5):1403-1414
This paper presents a brief overview of the field of structural nanocrystalline materials. These are materials in either bulk,
coating, or thin film form whose function is for structural applications. The major processing methods for production of bulk
nanocrystalline materials are reviewed. These methods include inert gas condensation, chemical reaction methods, electrodeposition,
mechanical attrition, and severe plastic deformation. The stability of the nanocrystalline microstructure is discussed in
terms of strategies for retardation of grain growth. Selected mechanical properties of nanocrystalline materials are described;
specifically strength and ductility. Corrosion resistance is briefly addressed. Examples of present or potential applications
for structural nanocrystalline materials are given. 相似文献
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The current state of the researches on diffusionless phase transformations, including allotropic, polymorphous and martensitic transformations, and phase stability are reviewed. The behaviors of phase transformation and phase stability in nanocrystalline materials are markedly affected by the non-equilibrium conditions involved in their preparation, as a result, in this review an ideal demonstrating method of critical size for the stability of a high-temperature phase at low-temperatures is suggested, and the intrinsic conditions of the phase stability are clarified. Our recent experiments exhibit that the reversal transformation temperatures of low-temperature phases in nanocrystalline Co bulk metal and Fe–30Ni wt% alloy are significantly raised up over 800 °C when their grain sizes are smaller than about 15 nm, while in the reported experiments of nanocrystalline particles or films the reversal transformation temperature lowers with decreasing grain size or is independent of grain size. Therefore, the author suggests that more experiments and theories for phase stability in reversal transformation should be performed. The study of grain growth kinetics of nanocrystalline materials, as a basic of investigating phase stability, is another attention aspect. 相似文献
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P. Luo H. Xie M. Paladugu S. Palanisamy M. S. Dargusch K. Xia 《Journal of Materials Science》2010,45(17):4606-4612
It has been demonstrated that severe plastic deformation (SPD) can be used to consolidate particles of a wide range of sizes
from nano to micro into fully dense bulk material with good mechanical properties. SPD consolidation allows processing to
be conducted at much lower temperatures and is therefore suitable for particles with highly metastable structures such as
nanocrystalline. It is especially useful in the fabrication of multiphase materials including metal matrix nanocomposites.
In this investigation, SPD consolidation was applied to recycle Ti machining chips. In particular, the as-received chips were
consolidated by equal channel angular pressing at temperatures between 400 and 600 °C with the application of a back pressure
from 50 to 200 MPa. Fully dense bulk Ti with fine grain sizes was produced, possessing strength comparable or higher than
that of commercially pure wrought Ti. It is concluded that SPD consolidation is a promising method for recycling and value-adding
of Ti chips. 相似文献
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采用放电等离子烧结技术制备了全致密镝纳米晶块体材料,研究晶粒尺寸对其结构和磁性的影响。显微组织分析发现,在573K和773K的烧结条件下,材料的平均晶粒尺寸分别为10nm和100nm左右,晶体结构分析发现,镝纳米晶块体是与原始粗晶镝一样的密排六方结构晶体,磁性能测试结果表明,随着平均晶粒尺寸的下降,样品的奈尔温度(T_N)逐渐降低,而居里温度(T_C)则先降低后升高,在5K温度和9T磁场下,平均晶粒尺寸10nm的镝块体材料比粗晶镝的磁化强度降低了3.35%,矫顽力则增加了3倍。 相似文献
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Uniaxial compression tests were carried out to completely understand the evolution of porosity in porous bulk nanocrystalline materials, and a new evolution law of porosity under uniaxial compression was proposed. Based on the energy principle, we built a mechanical model to calculate the overall mechanical properties of bulk nanocrystalline materials. The comparison between predicted results and the corresponding experimental data indicates that the established model is capable of describing the plastic mechanical behaviors of porous nanocrystalline materials. 相似文献