硝酸铵/尿素配比对氧化铝-莫来石复合材料反应过程及结构的影响

IF 0.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
E. Feizabadi, A. Meysami, M. Hajisafari
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引用次数: 1

摘要

本研究以非水合硝酸铝和硅粉为原料,通过溶液燃烧合成(SCS)制备了铝莫来石复合材料。本文旨在研究硝酸铵作为共燃料加入尿素中对铝莫来石形成的影响。为此,硝酸铵/尿素比例分别为0、0.2、0.4和0.5。热化学计算表明,增大这一比值可以提高燃烧的绝热温度,有利于莫来石结晶的形成,这一点也得到了结构分析的证实。XRD谱图表明,随着硝酸铵/尿素比的增大,莫来石峰增强,并有向结晶结构转变的趋势。莫来石体积分数由4.12%提高到30.52%。扫描电镜研究表明,这一比例减少了平均粒径从264到133纳米。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Influence of Ammonium Nitrate/Urea Ratio on the Reaction Process and Structure of Formed Alumina–Mullite Composite

The Influence of Ammonium Nitrate/Urea Ratio on the Reaction Process and Structure of Formed Alumina–Mullite Composite

In this study, the initial materials including aluminum nitrate nonahydrate and silicon powder were used to produce alumina–mullite composite through solution combustion synthesis (SCS). This paper aimed to investigate the influence of ammonium nitrate added as co-fuel to urea on the formation of alumina–mullite. For this purpose, ammonium nitrate/urea ratios of 0, 0.2, 0.4 and 0.5 were used for SCS. It was revealed through thermo-chemical calculations that increasing this ratio enhances the adiabatic temperature of combustion and facilitates the formation of crystalline mullite that is confirmed by structural analysis. XRD patterns showed that with increasing ammonium nitrate/urea ratio, the mullite peaks are intensified, and its trend is into the crystalline structure. Hence the mullite volume fraction increased from 4.12 to 30.52%. SEM studies showed that this ratio decreases a mean particles size from 264 to 133 nm.

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来源期刊
CiteScore
1.00
自引率
33.30%
发文量
27
期刊介绍: International Journal of Self-Propagating High-Temperature Synthesis  is an international journal covering a wide range of topics concerned with self-propagating high-temperature synthesis (SHS), the process for the production of advanced materials based on solid-state combustion utilizing internally generated chemical energy. Subjects range from the fundamentals of SHS processes, chemistry and technology of SHS products and advanced materials to problems concerned with related fields, such as the kinetics and thermodynamics of high-temperature chemical reactions, combustion theory, macroscopic kinetics of nonisothermic processes, etc. The journal is intended to provide a wide-ranging exchange of research results and a better understanding of developmental and innovative trends in SHS science and applications.
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