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Synthesis of ultrafine aluminum nitride powder using a new carbothermal reduction process.

机译：使用新的碳热还原工艺合成超细氮化铝粉末。

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摘要

Ultrafine AlN powders were synthesized from two different precursors; namely, aluminum isopropoxide and aluminum nitrate. The aluminum isopropoxide was dissolved in water + citric acid, and polymerized in ethylene glycol. The aluminum nitrate was dissolved in water + glucose. The starting solutions were rapidly spray dried to form homogeneous precursor powders, which were thermochemically converted to AlN powders by calcining in flowing nitrogen or ammonia. Uncombined carbon was eliminated from the product powder by heating in flowing ammonia. This treatment avoided undesirable oxidation of the AlN particles.;The synthesized powders were characterized by XRD, SEM, TEM, BET and elemental analysis. It was found that nitridation began at much lower calcination temperatures (1300;AlN powder in which a sintering aid (yttrium oxide or nitride) is uniformly dispersed was obtained by mixing yttrium nitrate in the starting solution, prior to spray drying and calcination. The powder was pressureless sintered at 1800;The measured thermal conductivity of the sintered samples was 183 W/mK. This result compares favorably with the best values reported in the literature. However, on theoretical grounds, the thermal conductivity of pure AlN at room temperature is predicted to be 320 W/mK. Future work will attempt to achieve this theoretical goal, using the recently developed 'gas condensation processing' method for synthesizing ultrapure ceramic powders.
机译：AlN超细粉末是由两种不同的前体合成的。即异丙醇铝和硝酸铝。将异丙醇铝溶解在水+柠檬酸中，并在乙二醇中聚合。将硝酸铝溶解在水+葡萄糖中。将起始溶液快速喷雾干燥以形成均质的前体粉末，通过在流动的氮气或氨气中煅烧将其热化学转化为AlN粉末。通过在流动的氨中加热，从产物粉末中消除了未结合的碳。该处理避免了AlN颗粒的不希望的氧化。；通过XRD，SEM，TEM，BET和元素分析对合成的粉末进行了表征。发现氮化是在低得多的煅烧温度下开始的（1300；在喷雾干燥和煅烧之前，通过将硝酸钇混合在起始溶液中而获得均匀分散有烧结助剂（氧化钇或氮化氮化物）的AlN粉末。在1800℃进行无压烧结；测得的烧结样品的热导率为183 W / mK，与文献报道的最佳值相吻合，但从理论上讲，可以预测纯AlN在室温下的热导率达到320 W / mK。未来的工作将尝试使用最近开发的“气体冷凝处理”方法合成超纯陶瓷粉末来实现这一理论目标。

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  • 作者

    Chiang, Chunyen.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 162 p.
  • 总页数 162
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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