Study on the Production of Amorphous Alloy Powders with Very Thin and Large Aspect Rations by a Two-Stage Quenching Method

1991年，我们建造了两级快速淬火设备，确定了在Fe、Co和Ni基合金中制备薄片状非晶粉末的适宜条件。此外，我们还研究了片状非晶粉末的热稳定性、耐腐蚀性和磁性的基本性质，阐明了片状非晶粉末具有不同于非晶片和线材的独特特性。1992年，我们在难熔的钛和锆基合金系统中寻找了具有较大非晶形成能力的合金系统和合金成分。随后，对上述合金进行了片状非晶态粉末的生产试验，确定了最佳雾化条件。我们还测试了片状粉末的形貌、热稳定性和耐腐蚀性，并研究了合适的…与难熔金属基合金中片状非晶粉末的制备工艺。1993年，人们尝试了片状非晶粉末的生产，但由于铝基合金的比重低，粉末难以从旋转转子上剥落，因此难以生产片状非晶粉末。结果表明，通过改变旋转转轮的表面态，可以获得高产率的片状非晶态铝基粉末。与片状Fe、Co、Ni、Ti和Zr基非晶粉末相似，片状Al基非晶粉末的结构弛豫热也是非晶条带的两倍左右，表明非晶粉末是以很大的冷却速率产生的。此外，我们还评价了Fe-Co基片状非晶粉末作为磁屏蔽材料以及Ti-Al基片状非晶粉末作为耐蚀涂层材料的特性。结果表明，采用两段淬火工艺制备的Fe、Co、Ti、Al系片状非晶粉末具有极薄的形状和独特的非晶态结构，具有作为磁屏蔽和防腐涂层材料的特点。较少

In 1991, we constructed a two-stage rapid quenching equipment and determined appropriate conditions for the production of flaky amorphous powders with very thin thickness in Fe-, Co- and Ni-based alloys. Furthermore, we examined fundamental properties of thermal stability, corrosion resistance and magnetic properties for the flaky amorphous powders and clarified that the flaky amorphous powders have unique characteristics which were different from those for amorphous sheets and wires.In 1992, we searched alloy systems and alloy compositions in which a large glass-forming ability leading to the formation of flaky amorphous powders is achieved in refractory Ti- and Zr-based alloy systems. Subsequetly, the production of flaky amorphous powders was tried for the above-described alloys and the most appropriate atomizing conditions were determined. We also examined the morphology, thermal stability and corrosion resistance of the flaky powders.and investigated the relation between the proper … More ties and the preparation process of the flaky amorphous powders in their refractory metal base alloys.In 1993, the production of flaky amorphous powders was tried for Al-based alloys where the exfoliation of the powder from the rotating roter is difficult because of their low specfic weight and the production of the flaky amorphous powder is difficult. As a result, it was found that the modification of the surface state of the rotating roter enables a high production ratio of Al-based flaky amorphous powders. As similar for the Fe-, Co-, Ni-, Ti- and Zr-based amorphous powders with flaky morphology, the Al-based flaky powders also have the heat of structural relaxation which is about two times as large as those for the amorphous ribbons, indicating that the amorphous powders were produced at very large cooling rates.In addition, we evaluated the characteristics of the Fe- and Co-based flaky amorphous powders as magnetic shielding materials as well as the Ti- and Al-based flaky amorphous powders as corrosion resistanct painting materials. As a result, it was confirmed that the flaky amorphous powders in Fe, Co, Ti and Al based systems produced by the two-stage quenching technique have the characteristics which are good enough to use practically as magnetic shielding and corrosion resistant painting materials because of their extremely thin form and their unique amorphous structure. Less