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1.
A preliminary study of the reproducibility of aluminum foam was performed. Aluminum foam was fabricated by a sintering and dissolution process. It was found that aluminum foam containing a blowing agent can be fabricated without the decomposition of the blowing agent, namely, the densified aluminum foam can be used as a foamable precursor for refoaming. By heat treatment of the densified aluminum foam containing the blowing agent, pores were reproduced in the aluminum.  相似文献   

2.
粉末冶金法制备通孔泡沫铝   总被引:4,自引:1,他引:3  
通孔多孔金属材料具有良好的性能,被广泛用于各个领域。文章采用粉末烧结法制备了铝多孔泡沫金属材料,并对材料制备过程的工艺参数及材料的孔结构进行了初步的研究。  相似文献   

3.
Functionally graded (FG) aluminum foam consisting of A1050 and A6061 aluminum alloy was fabricated by using friction stir processing (FSP). The fabrication of the precursor and the bonding of the A1050 precursor to the A6061 precursor can both be conducted by FSP. According to the results of point analysis, the Mg content gradually changed in the bonding region, and it was shown that seamless FG aluminum foam can be fabricated by the FSP route.  相似文献   

4.
Two-layered aluminum foam having layers with both closed-cell and open-cell pores was fabricated using the precursor foaming process and the sintering dissolution process. It was found that a two-layered Al foam with different pore structures but similar compression properties in each layer can be obtained. This foam is expected to have a region with superior thermal insulation and a region with superior heat release properties.  相似文献   

5.
Fabrication of Aluminum Foam/Dense Steel Composite by Friction Stir Welding   总被引:1,自引:0,他引:1  
Aluminum foam/dense steel composites were fabricated by friction stir welding (FSW). It is expected that both mixing a blowing agent into aluminum and bonding the aluminum precursor to steel can be conducted simultaneously by FSW. It was shown that although heat treatment of the precursor evolved a brittle intermetallic compound layer, the bonding strength of the interface consisting of the intermetallic compound layer was relatively high compared with the fracture strength of the aluminum foam itself.  相似文献   

6.
铝粉末压制过程有限元模拟研究   总被引:3,自引:0,他引:3  
周洁  陆建生  左孝青  宋鹏  张德丰 《云南冶金》2005,34(5):45-49,70
根据粉末材料的塑性理论及Shima-Oyane屈服准则,利用体积可压缩有限元法,采用MARC有限元分析软件对铝粉的单向压制和双向压制过程进行了数值模拟。得到了粉末材料在压制过程中的变形特征、相对密度分布及粉末质点的流动规律,得到单向压制和双向压制的密度分布图,并对其差异进行了分析。模拟结果对揭示粉末压制过程机理,制订压制工艺都有显著意义。  相似文献   

7.
Batienkov  R. V.  Efimochkin  I. Yu.  Osin  I. V.  Khudnev  A. A. 《Metallurgist》2020,63(11-12):1329-1336
Metallurgist - This paper presents the results of studying the production of molybdenum-tungsten alloys by spark plasma sintering at various process conditions, as well as the processes of material...  相似文献   

8.
9.
Niobium consumable electrodes of 10?mm dia?×?50?mm length were prepared by cold isostaic pressing with compaction pressure of 125?C250?MPa. The compacts were sintered under vacuum at different temperatures in the range of 1000?C1800?oC. The CIPed and sintered electrodes were characterized with respect to chemical analysis, density, microstructure and bend strength. The results showed that there is a marginal improvement in density at a sintering temperature in the range of 1000?C1400?oC, while a significant improvement in density was observed at sintering temperature in the range of 1600?C1800?oC. The bend strength of sintered electrode was found to increase with increasing sintering temperature and that attains a highest value at a sintering temperature in the range of 1600?C1800?oC. Sintering at a temperature higher than 1400?oC leads to decrease in oxygen content of the electrodes. The oxygen content was decreased from 2000 to 500?ppm when electrode was sintered at 1800?oC.  相似文献   

10.
以空气雾化的A1Si12合金粉、镁粉和氢化钛粉末为原料,采用包套轧制法成功制备出了泡沫铝三明治板材.利用300 dpi扫描仪、扫描电镜(SEM)和显微硬度仪等检测方法系统比较了复合轧制和包套轧制方法对制备前驱体的宏观形貌和界面结合及其泡孔结构的影响,结果表明:包套轧制可以有效阻止面板材料裂纹的扩展,获得完整的和致密度均匀的预制坯,并能实现面板芯材的有效结合,最终获得泡孔结构完整和均匀的泡沫铝三明治板.  相似文献   

11.
粉末冶金发泡法制备泡沫铝工艺研究   总被引:3,自引:1,他引:3  
泡沫金属是近年来发展起来的一种新型结构功能材料.采用粉末冶金发泡法制备出孔隙率为45%-85%、平均孔径<5mm的多孔泡沫铝合金试样,并用极差分析法讨论了发泡温度、保温时间和发泡剂的状态对泡沫铝合金的孔隙率的影响,得到了最佳制备工艺条件.  相似文献   

12.
研究了HDDR三元NdFeB各向异性磁粉的制备工艺.发现脱氢速度对HDDR三元各向异性NdFeB的磁性能具有显著影响;缓慢的脱氢处理有助于材料获得高的各向异性.在最佳工艺条件下,可获得磁能积为84 kJ·m3的HDDR三元NdFeB各向异性粘结磁体.  相似文献   

13.
Closed-cell type barrier ribs such as meander, honeycomb, SDR, and waffle types were produced using capillary molding process. Sintering of the ribs revealed that the ribs with asymmetric geometry such as meander and SDR type became distorted severely by the sintering process, but the ribs with symmetric geometry such as honeycomb and waffle type maintained their green state morphology. After sintering, the ribs were coated with green phosphor using osmosis coating process and its luminance characteristics were evaluated. The results indicated that the luminance and its efficiency is improved by using closed-cell type ribs with the new phosphor forming technology.  相似文献   

14.
对在氮气惰性气氛下,利用废弃铝边角料生产片状铝粉的可行性进行了研究。研究发现在球磨过程中,废铝片通过钢球的微锻作用相互挤压分层、延展、细碎、最后形成片状铝粉,球罐中的钢球球径大小与片状铝粉的产出性能有着重要的关系,球径大的钢球研磨对铝粉的形成更有利;在球磨的前25h过程中,适当次数的间歇停机冷却球罐可以提高铝粉的细度;硬脂酸的加入可以减少铝粉与铝粉,铝粉与钢球或罐壁的摩擦,降低球磨效率。加入3%的硬脂酸作为助磨剂球磨效果最佳。所得片状铝粉可用于指纹鉴定,加气节能混凝土等。  相似文献   

15.
难溶铑粉的溶解工艺研究   总被引:2,自引:0,他引:2       下载免费PDF全文
研究了氯金酸法溶解铑的工艺,探索了液固比、金的浓度、盐酸浓度、反应温度、反应时间等对铑粉溶解率的影响。最佳工艺条件为:液固比10∶1、溶液中金浓度250g/L、盐酸浓度11mol/L、反应温度130℃、反应时间18h、搅拌速率50r/min,此条件下铑的一次溶解率可达98.74%。  相似文献   

16.
泡沫铝材的生产及工艺研究进展   总被引:4,自引:1,他引:3  
余东梅 《铝加工》2004,(2):24-26
本文综述了国内外泡沫铝材最近的生产及工艺研究进展,着重介绍了几种技术先进、效果显著的泡沫铝材的生产工艺。  相似文献   

17.
介绍了微细铝粉生产工艺的设计,列出了主要工艺特点及技术经济指标,提出了有关问题和建议。  相似文献   

18.
在普通粉末喷涂工艺的基础上进行了试验研究与改进,确定了铝型材喷涂砂纹粉末涂层的最佳工艺参数。生产实践表明涂层效果良好,很好地满足了客户要求。  相似文献   

19.
20.
《铝加工》2015,(4)
介绍了国内外PCM法制备泡沫铝的研究现状,并对利用PCM法制备泡沫铝过程中原料和工艺对其孔结构的影响进行了总结,分析了PCM法制备泡沫铝合金现存的问题及发展方向。  相似文献   

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