Preparation of quasicrystalline particles with uniform size

本项目的目的是尝试建立一种制备尺寸均匀的准晶颗粒的方法。该装置的建立为准晶颗粒作为涂层材料或抛光粉应用于超精加工提供了可能。用涡轮分子泵建造了直径25 cm、高45 cm的不锈钢工作室，真空至5×10~(-4)Pa。为了控制颗粒的大小，在普通的气体蒸发技术中，向下蒸发Al-Mn合金，以便只在三个生长区中形成外部区域。然而，由于合金与W、Ta等源材料的反应，试验失败了。其次，通过颗粒捕获时间、蒸发温度和气体压力的函数，寻找了在试验室中制备的所有颗粒都是准晶相而没有平衡合金相的条件。然而，该条件确实很难找到，还需要在制备工艺上进一步研究。

The purpose of the present project is that an establishmant of the preparation method of quasicrystalline particles with uniform size is tried. The establishment may bring about a possibility of application of quasicrystalline particles as coating materials or polisheng powder for ultra-finishing.A working chamber of stainless steel constructed is 25cm in diameter, 45cm in hight and evacuated down to 5x10^<-4> Pa by using a turbo-molecular pump.For control of the particle size, a downward evaporation of Al-Mn alloy has tried so as to form only outer zone among the three growth zones in ordinary gas evaporation technique. However, the trial has failed due to a reaction of the alloy with the source materials such as W, Ta.Next, the condition of which the all particles prepared in the work chamber are quasicrystalline phase without the equilibrium alloy phase has been searched by the function of capture duration of particles, evaporation temperature and gas pressure. Howerer, it was really difficult to find the condition and is required further investigation on the preparation technique.