共查询到19条相似文献,搜索用时 78 毫秒
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泡沫金属应变率效应研究概述 总被引:1,自引:0,他引:1
泡沫金属是一种优良的冲击吸能材料.研究高应变率下泡沫金属力学性质多采用分离式Hopkinson压杆系统.国内外采用分离式Hopkinson压杆对各种类型的泡沫金属材料做了大量的研究,并对应变率效应作出了各种解释.但是,由于泡沫金属制备方法、材质、结构等的不同,一些实验结果和原因解释也不尽一致.据此,对近年来国内外的研究进展成果做了进一步的介绍. 相似文献
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泡沫钛融合了泡沫结构与金属钛的双重属性,具有出色的力学性能、优异的耐腐蚀性和良好的生物相容性等优点,在航空、航天、海洋工程、生物医学、能源与环保等领域应用前景广阔。基于粉末冶金技术的造孔剂法是目前制备泡沫钛的主流方法,不仅具有操作简单、设备要求低的优点,而且能通过调整造孔剂参数来控制最终制品的结构与性能。本文综述了造孔剂法制备泡沫钛领域的研究现状与进展,通过分析文献、整理数据,讨论了高孔隙率泡沫钛的研究历程和瓶颈问题,指出了泡沫钛孔隙率研究的发展趋势。 相似文献
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多孔材料孔率的测定方法 总被引:7,自引:0,他引:7
孔率是多孔材料的关键指标,是多孔材料若干性能最主要的决定性因素。简单介绍了测定多孔材料孔率的几种常用方法,包括显微分析法、质量.体积直接计算法、浸泡介质法、漂浮法和压汞法等。 相似文献
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多孔材料孔径及孔径分布的测定方法 总被引:7,自引:0,他引:7
孔径及其分布显著影响着多孔体的透过性、渗透速率、过滤性等一系列性能。本文介绍多孔材料孔径及其分布的常用测定方法,包括断面直接观测法、气泡法、透过法、压汞法、气体吸附法、液.液法、悬浮液过滤法、X射线小角度散射法等,并对几种测量方法进行了比较。 相似文献
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In the project introduced here, the manufacture of light‐metal foams based on magnesium are investigated and enhanced. Such foams possess an excellent mass‐volume ratio and are therefore perfectly suited as light and effective reinforcing elements. Apart from other functional properties, their suitability as energy absorbing crash elements is to be particularly emphasised and is the focus of the investigations here. In the case of impact loading, the energy is largely transformed into the work of plastic deformation during a reduction in volume. Although metallic foams themselves possess only low absolute strengths, it is expedient to employ them in the form of material combinations like sandwich structures or composites by integrating additional internal reinforcing elements. The latter approach is pursued in the present project. Both the initial results of the feasibility study and also the metallographic and mechanical investigations for characterising reinforced magnesium foams are presented. 相似文献
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熔体吹气发泡法制备泡沫铝合金研究 总被引:9,自引:1,他引:8
泡沫金属是近年来发展起来的一种新型材料。文章采用熔体吹气发泡法制备出了孔径为5.0—8.3mm,壁厚为0.040—0.076mm,密度为0.19—0.40g/cm^3,孔隙率为85.2%—93.0%的Al—Si泡沫铝合金,并着重讨论了发泡温度、气体流量、SiC粉末体积百分含量对泡沫铝合金形成的孔径和壁厚的影响关系。 相似文献
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Porous materials featuring cellular structures are known to have many interesting combinations of physical and mechanical properties. Some of them have been extensively used in structural applications (i.e. balsa wood), as well as in functional applications (heat exchangers, filters, etc.). Steel foams present promising theoretical properties for both functional and structural applications, but processing such kind of foams is complex due to their high melting temperature. Starting from a technique based on molten metal infiltration into a ceramic space holder, a new process is presented here for open‐cell steel sponges processing. Using a SiC cellular preforms as a space holder, dual phase steels foams with different porosity and steel microstructure were successfully developed. This technique is suitable to obtain steel alloy sponges featured by a relative density equal to 0,6 and interconnected pores. The compression tests indicate that the resulting material features the typical stress‐strain behaviour of classical cellular metals. Moreover mechanical properties, such as Elastic Modulus, σplateau, εdensification and Eabsorbed, depended on porosity and on martensite fraction, which is a function of the applied intercritical temperature. 相似文献