烧结溶解法制备多孔铝材料的工艺特性研究

发布时间：2018-05-31 19:26

本文选题：粉末冶金 + 多孔铝　；参考：《粉末冶金技术》2017年03期

【摘要】：以纯Al粉、纯Mg粉和水溶性造孔剂为原料,利用烧结溶解法制备多孔铝材料,通过真空烧结和热压烧结两种方式,研究烧结工艺和Mg的添加对多孔铝烧结致密化及其孔结构的影响。采用扫描电子显微镜(scanning electron microscope,SEM)和X射线衍射仪(X-ray diffractometer,XRD)等设备分析多孔铝的显微组织和相成分,利用万能力学试验机和显微硬度仪等仪器检测多孔铝的压缩强度和显微硬度。结果表明:升高烧结温度和延长烧结时间均有利于多孔铝骨架的致密;随烧结温度的升高,孔隙边缘由尖锐逐渐变得圆滑;Mg的添加可破除Al颗粒表面氧化膜,并生成MgAl_2O_4尖晶石,促进烧结致密化和孔结构收缩,进而提升多孔铝的力学性能。
[Abstract]:Using pure Al powder, pure mg powder and water-soluble pore-forming agent as raw materials, porous aluminum materials were prepared by sintered dissolution method. Vacuum sintering and hot pressing sintering were used to prepare porous aluminum materials. The effects of sintering process and mg addition on the densification and pore structure of porous aluminum were studied. Scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to analyze the microstructure and phase composition of porous aluminum. The compressive strength and microhardness of porous aluminum were measured by universal mechanical tester and microhardness tester. The results show that increasing sintering temperature and prolonging sintering time are beneficial to the densification of porous aluminum skeleton, and with the increase of sintering temperature, the pore edge becomes sharp and smooth, and the addition of mg can break down the oxide film on Al particle surface and form MgAl_2O_4 spinel. It promotes sintering densification and pore structure shrinkage, and then improves the mechanical properties of porous aluminum.
【作者单位】：中南大学粉末冶金国家重点实验室;
【基金】：国家重点基础研究发展规划资助项目(61xxxxx02) 中央高校基本科研业务费专项资金资助项目(2016zzts031)
【分类号】：TF125.6

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