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

铝的硝酸盐已经被广泛地用于原子化的粉末。在这一工作中，氮是通过使用2毫米大小的铝片进行研究的，铝片的混合物和铝片的原子化粉末首先导致与氮反应。铝片的纳米片完全完成了1300%以上的芯片含量，添加Y（NO_3）_3·6H_2O。添加，使用一个图形反应管，没有原子化的铝片可以与99.3%的最大转换进行纳米化。有许多尺寸为2毫米的软壳可以在产品中观察到。Furthermore，A1 N的精粉，1毫米，大小在球体外壳周围。在表面壳的形成之后，温度迅速增加，到反应热被探测到。因此，铝片的硝化过程分为两个步骤;这是在初始步骤中，铝片在N_2表面上的反应与覆盖AlN layr。在高温下，反应热的一代是足够的蒸发在外壳中的铝。这是第二步的开始。铝蒸汽将通过AlN层与外壳外的氮素气体反应。在这一过程中，初始步骤对硝化非常重要。Y_2O_3，从Y（NO_3）_3·6H_2O转换的哪一方，可以加速在初始步骤中的硝化。铝导线在直径上2毫米，长度在电上50毫米，在初始步骤中加速硝化。没有Y_2O_3的硝化被实现了99.6%的最大转化。在这项工作中，大规模的枚举是成功的硝化的。这一结果将对该行业中的AlN粉末制备过程产生重大影响。

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.