...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Oxidation and melting of aluminum nanopowders
【24h】

Oxidation and melting of aluminum nanopowders

机译：铝纳米粉的氧化和熔融

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Recently, nanometer-sized aluminum powders became available commercially, and their use as potential additives to propellants, explosives, and pyrotechnics has attracted significant interest. It has been suggested that very low melting temperatures are expected for nanosized aluminum powders and that such low melting temperatures could accelerate oxidation and trigger ignition much earlier than for regular, micron-sized aluminum powders. The objective of this work was to investigate experimentally the melting and oxidation behavior of nanosized aluminum powders. Powder samples with three different nominal sizes of 44, 80, and 121 nm were provided by Nanotechnologies Inc. The particle size distributions were measured using small-angle X-ray scattering. Melting was studied by differential scanning calorimetry where the powders were heated from room temperature to 750 C in an argon environment. Thermogravimetric analysis was used to measure the mass increase indicative of oxidation while the powders were heated in an oxygen-argon gas mixture. The measured melting curves were compared to those computed using the experimental particle size distributions and thermodynamic models describing the melting temperature and enthalpy as functions of the particle size. The melting behavior predicted by different models correlated with the experimental observations only qualitatively. Characteristic stepwise oxidation was observed for all studied nanopowders. The observed oxidation behavior was well interpreted considering the recently established kinetics of oxidation of micron-sized aluminum powders. No correlation was found between the melting and oxidation of aluminum nanopowders.
机译：近来，纳米尺寸的铝粉在市场上可以买到，它们作为推进剂，炸药和烟火技术的潜在添加剂已引起人们的极大兴趣。已经提出，对于纳米尺寸的铝粉，期望非常低的熔融温度，并且与常规的微米尺寸的铝粉相比，这样的低熔融温度可以更早地加速氧化并引发点火。这项工作的目的是实验研究纳米级铝粉的熔化和氧化行为。 Nanotechnologies Inc.提供具有44、80和121 nm三种不同标称尺寸的粉末样品。使用小角度X射线散射测量粒度分布。通过差示扫描量热法研究熔融，其中在氩气环境中将粉末从室温加热至750℃。当粉末在氧气-氩气混合物中加热时，使用热重分析法测量指示氧化的质量增加。将测得的熔融曲线与使用实验粒径分布和描述熔融温度和焓随粒径变化的热力学模型计算得到的熔融曲线进行比较。不同模型预测的熔融行为仅与定性相关。对于所有研究的纳米粉，观察到特征性的逐步氧化。考虑到最近建立的微米级铝粉的氧化动力学，可以很好地解释观察到的氧化行为。在铝纳米粉的熔融和氧化之间未发现相关性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号