摘要
提出了多孔钛制备的新方法,先采用占位体法制备出具有一定孔结构的二氧化钛,而后通过钙蒸气还原、浸出,获得多孔钛。借助X射线衍射、扫描电镜、X射线能谱仪、压汞仪等检测手段分别考察了造孔剂种类、造孔剂添加量、烧结温度、升温速率等对多孔二氧化钛孔结构的影响;并且通过钙蒸气还原制备出了具有一定孔结构的多孔钛。实验结果表明:添加不同种类造孔剂制备出的多孔二氧化钛的孔隙率大小的顺序为:柠檬酸>淀粉>石墨;烧结温度区间在800℃~1100℃时,样品的孔隙率呈现先上升后下降的趋势;淀粉为造孔剂时,获得更加均匀的孔分布;将所制备的多孔二氧化钛还原,所得到的多孔钛具有一定孔隙结构,并且随着多孔二氧化钛孔隙率的增大,所得多孔钛表面孔增多,多孔钛结构更加疏松。
Metallicporous titanium was produced by vacuum calciothermic reduction and leaching of the TiO2 precursor,fabricated with the TiO2 powder and different pore forming-agents. The impact of the sintering temperature,sintering temperature increase-rate and properties of pore-forming agent on the TiO2 porosity was investigated with X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy and mercury prosimeter. The results show that the TiO2 porosity strongly depends on the pore-forming agent and sintering temperature. For example,the porosity of citric acid,starch and graphite followed a descending order; as the sintering temperature increased in 800 - 1100℃ range,the porosity changed in an increase-decrease mode. Starch accounted for a fairly uniform pore-size distribution. However,highly porous TiO2 precursor resulted in significant increases of surface pore density and looseness of the bulk porous titanium.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2017年第3期332-340,共9页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金项目资助课题（51464023）
云南省中青年学术技术带头人后备人才培养计划项目资助课题（2017HB009）
云南省领军人才计划项目资助课题（2014HA003）
科技部重点领域创新团队项目资助课题（2014RA4018）
关键词
多孔二氧化钛
多孔钛
钙热还原
压汞法
造孔剂
Porous titanium dioxide
Porous titanium
Calcium thermal reduction
Mercury intrusion method
Pore forming agent
