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Preparation of Aluminum Nitride by Direct Nitriding of Large-Sized Aluminums

大尺寸铝材直接氮化制备氮化铝

基本信息

批准号：
05650844
负责人：
ITO Shigeru
金额：
$ 1.28万
依托单位：
SCIENCE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650844/
关键词：
Nitriding Aluminum Nitrogen Aluminum Nitride Yttrium Oxide Etching Vapor Phase Reaction Wire 窒素ガス窒化反応

项目摘要

Nitriding of aluminum has been generally performed for the atomized powder. In this work, the nitriding was studied by the use of aluminum chips with 2 mm in size.The mixtures of aluminum chips and atomized powder of aluminum were firstly caused to react with nitrogen. The nitriding of aluminum chips was completely accomplished at 1300ﾟC below 50% of chip content, adding Y(NO_3)_3・6H_2O.In addition, using a graphite reaction tube, Al chips without atomized powder were able to be nitrided with the maximum conversion of 99.3%.A lot of spherical shells with 2mm in size was observed in the product. Furthermore, fine powder of A1N with 1 mum in size was observed around the spherical shell. After the formation of spherical shells, rapid increase of temperature due to reaction heat was detected. Therefore, the nitriding process of Al chips was divided into two steps ; that is, in the initial step, molten Al chip reacts with N_2 on the surface to cover with AlN layr. At a high temperature, the generation of reaction heat is enough to vaporize the aluminum in the shell. This is the beginning of the second step. The aluminum vapor goes through the AlN layr to react with nitrogen gas outside of the shell. In this process, the initial step is very important for the nitriding. Y_2O_3, which is transformed from Y(NO_3)_3・6H_2O,may accelerate the nitriding in the initial step.Al wires with 2 mm in diameter and 50 mm in length were electrolytically etched to accelerate the nitriding in the initial step. The nitriding without Y_2O_3 was accomplished with the maximum conversion of 99.6%.In this work, the large-sized aluminums were successfully nitrided. This results will largely affect the process preparing AlN powders in the industry.

通常对雾化粉末进行铝的氮化。在这项工作中，利用尺寸为2mm的铝屑研究了氮化。首先使铝屑和铝雾化粉末的混合物与氮气发生反应。添加Y(NO_3)_3・6H_2O，铝屑在1300℃以下完全氮化，屑含量低于50%。此外，使用石墨反应管，无需雾化粉末的铝屑也能氮化，最大转化率达到99.3%。在产品中观察到大量2mm大小的球壳。此外，在球壳周围观察到尺寸为1μm的AlN细粉。球壳形成后，检测到由于反应热而导致温度快速升高。因此，铝片的氮化过程分为两步；即，在初始步骤中，熔融的Al片与表面的N_2反应，覆盖AlN层。在高温下，产生的反应热足以使壳体内的铝汽化。这是第二步的开始。铝蒸气穿过AlN层与壳外的氮气发生反应。在此过程中，初始步骤对于氮化非常重要。由Y(NO_3)_3·6H_2O转变而来的Y_2O_3可以加速初始阶段的氮化。采用电解蚀刻直径2mm、长度50mm的Al丝来加速初始阶段的氮化。实现了不含Y_2O_3的氮化，最高转化率达到99.6%。本工作成功地对大尺寸铝进行了氮化。这一结果将在很大程度上影响工业上制备AlN粉末的工艺。