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[1]彭飞,姜勇刚,冯军宗,等.高比表面积Y掺杂Al2O3气凝胶制备及Y的作用机制[J].南京工业大学学报(自然科学版),2020,42(04):477-484.[doi:10.3969/j.issn.1671-7627.2020.04.005]
 PENG Fei,JIANG Yonggang,FENG Junzong,et al.Preparation of Y-doped Al2O3 aerogels with high specific surface areas and Y function[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2020,42(04):477-484.[doi:10.3969/j.issn.1671-7627.2020.04.005]
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高比表面积Y掺杂Al2O3气凝胶制备及Y的作用机制()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
42
期数:
2020年04期
页码:
477-484
栏目:
出版日期:
2020-07-17

文章信息/Info

Title:
Preparation of Y-doped Al2O3 aerogels with high specific surface areas and Y function
文章编号:
1671-7627(2020)04-0477-08
作者:
彭飞姜勇刚冯军宗李良军冯坚
国防科技大学 空天科学学院 新型陶瓷纤维及其复合材料重点实验室,湖南 长沙 410073
Author(s):
PENG Fei JIANG Yonggang FENG Junzong LI Liangjun FENG Jian
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
关键词:
Al2O3气凝胶 Y掺杂 高比表面积 相转变
Keywords:
Al2O3 aerogels Y-dope high surface area phase transformation
分类号:
TB32
DOI:
10.3969/j.issn.1671-7627.2020.04.005
文献标志码:
A
摘要:
以Al(NO3)3、Y(NO3)3的水合物为前驱体,结合溶胶-凝胶法和超临界干燥方式,制备Y掺杂Al2O3气凝胶。研究气凝胶经热处理后的比表面积、晶相、微观形貌及气凝胶中Y元素分布形式的变化规律,并分析Y对气凝胶热稳定性的作用机制。结果表明:制备的Y掺杂Al2O3气凝胶具有较高的初始比表面积(483 m2/g),在高温下具有较高的比表面积保留(1 200 ℃处理后仍有80 m2/g)。Y元素在Al2O3气凝胶中均匀分布,抑制了高温下Al3+的扩散和重排,经1 200~1 300 ℃热处理后,Y元素由均匀分布转变为非均匀分布,在Al2O3颗粒表面生成Y和Al的化合物,能够进一步减少颗粒间的颈部接触,抑制烧结和相变。经1 300 ℃热处理后,由于Y和Al的化合物本身比表面积较低,气凝胶总的比表面积发生显著下降。
Abstract:
Y-doped Al2O3 aerogels were prepared by aluminum nitrate and yttrium nitrate precursors through the sol-gel and supercritical drying method. The specific surface areas, pore structures, phase transformation, micro structures and Y distribution of calcined Y-doped Al2O3 aerogels were investigated, and the influence mechanism of Y was discussed. The prepared Al2O3 aerogels had high specific surface areas(483 m2/g)and maintened at elevated temperatures(80 m2/g at 1 200 ℃). The uniformly distributed Y in Al2O3 aerogels suspended the vibration and rearrangement of Al3+. At 1 200-1 300 ℃, there was an enrichment of Y in Al2O3 aerogels, and the compounds of Y and Al emerged at the surface of Al2O3 particles. These compounds could further suppress the sintering and phase transformation to α-Al2O3, but the specific surface area of Y-doped Al2O3 aerogels decreased dramatically at 1 300 ℃ since the surface area of these compounds themselves was small.

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备注/Memo

备注/Memo:
收稿日期:2019-10-30
基金项目:湖南省自然科学基金面上项目(2018JJ2469)
作者简介:彭飞(1985—),男,E-mail:feijigong@126.com; 姜勇刚(联系人),副研究员,E-mail:jygemail@nudt.edu.cn.
引用格式:彭飞,姜勇刚,冯军宗,等.高比表面积Y掺杂Al2O3气凝胶制备及Y的作用机制[J].南京工业大学学报(自然科学版),2020,42(4):477-484.
PENG Fei, JIANG Yonggang, FENG Junzong, et al. Preparation of Y-doped Al2O3 aerogels with high specific surface areas and Y function[J].Journal of Nanjing Tech University(Natural Science Edition),2020,42(4):477-484..
更新日期/Last Update: 2020-07-30