摘要
在改性的二氧化硅微球表面直接镀覆具有自支撑性金层,采用类似粉浆浇注的方法将镀金的二氧化硅微球成形,再将成形热处理后的块体样品用氢氟酸去除二氧化硅模板,成功制备出圆柱体形状的泡沫金样品。建立了简便的二氧化硅模板法制备超低密度块体泡沫金的工艺,并对其制备工艺进行了研究。研究表明,化学镀金后SiO2微球表面的金沉积层厚度为100~200 nm;热处理后,化学镀金层的颗粒出现了明显的聚集长大现象;模板去除后金沉积层具有良好的自支撑性,获得的块体泡沫金样品由金空心球壳组成,圆柱体直径约2.3 mm,密度约0.6 g/cm3,孔隙率高达97%。
A self-supported gold layer was directly deposited on the surface of modified SiO2 microspheres, and then the obtained SiO2 microspheres were formed by a method similar to slurry-casting. Finally, SiO2 templates were removed from the heat-treated monolithic samples by hydrofluoric acid, and the monolithic foamed gold was obtained. A simple SiO2 template method was established to prepared ultra-low-density monolithic foamed gold and the process was studied. The results indicate that the thickness of deposited gold is 100~200 nm after electroless plating on the surface of SiO2. After heat treatment, the granules of the deposited gold are growing up with conglomeration. The self-supported hollow spheres are got after the template is removed. The ultra-low-density gold monoliths with porous structure, cylinder diameter of ~2.3 mm, density of 0.6 g/cm3, porosity of 97% are obtained.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第5期1273-1276,共4页
Rare Metal Materials and Engineering
基金
中国工程物理研究院科学技术发展基金(2013B0302052)
关键词
泡沫金
空心微球
可溶性模板法
gold foam hollow microspheres dissolvable template method
