Production of Nonequilibrium Alloy Powders by Ultrasonic and High-Pressure Gas Atomization Method and their Properties

超声高压气体雾化法制备非平衡合金粉末及其性能

基本信息

批准号：
61490003
负责人：
INOUE Akihisa
金额：
$ 3.65万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1988
项目状态：
已结题

项目摘要

A new liquid quenching equipment by utilizing an ultrasonic and high-pressure gas atomization method was designed and constructed with the aim of developing a method which can produce effectively amorphous spherical powders. Many factors of producing amorphous powders in Fe- and Co-based alloy systems were investigated and the atomization condition of producing the amorphous powders was established. Subsequently, the consolidation of the amorphous powders was tried by press-sintering at elevated temperatures. As a result, it was clarified that the consolidation is difficult for the spherical powders and the mixing of flaky powders to the spherical powders is very effective for the formation of amorphous bulks. From this information, the atomization equipment was modified so as to produce flaky powders as well as spherical powders. In the modification, the rotator was set up at the position just below the gas atomization nozzle and small atomized liquid droplets were flattened by the rotator, resulting in the formation of flaky powders with a small thickness of 1 to 3 m. Furthermore, the heat of relaxation was much larger than that for the melt-spun ribbons, indicating the achievement of much higher cooling velocities by the two-stage quenching method. The increase of cooling velocity is probably due to the subsequent cooling of super-cooled liquid droplets produced by gas atomization. In addition, the two-stage quenching technique was found to bring about the glass formation in new alloy systems such as Fe-C binary alloys and a remarkable extension of glass formation range in glass-forming alloy systems. These features of the newly developed two-stage quenching technique consisting of ultrasonic and high-pressure gas atomization followed by impact flattening of the supercooled liquid droplets are concluded to be attractive enough to confirm further progress of the two-stage quenching technique and the resulting nonequilibrium alloy powders.

设计和构建了一种新的液体淬火设备，以开发一种可以有效地产生无定形球形粉末的方法的设计和构建。研究了在Fe-和CO的合金系统中产生无定形粉末的许多因素，并建立了产生无定形粉末的雾化条件。随后，通过在升高温度下进行新闻插图来尝试无定形粉末的巩固。结果，澄清说，球形粉末难以合并，而片状粉末对球形粉末的混合对于形成无定形散装非常有效。从这些信息中，修饰了雾化设备，以生产片状粉末和球形粉末。在修饰中，旋转器是在气雾化喷嘴正下方的位置设置的，旋转器将小雾化的液滴扁平，从而形成了片状粉末，厚度为1至3 m。此外，放松的热量比熔融纺丝丝带的热量大得多，这表明通过两阶段的淬火方法实现了更高的冷却速度。冷却速度的增加可能是由于随后由气雾化产生的超冷液滴冷却。此外，发现两阶段的淬火技术可在新的合金系统（例如Fe-C二进制合金）中带来玻璃地层，并在形成玻璃合金系统中的玻璃形成范围显着扩展。新开发的两阶段淬火技术的这些特征包括超声波和高压气雾化，然后造成超冷液滴的影响，可以得出足够的吸引力，足以确认两阶段淬火技术的进一步进展以及由此产生的非平衡合金粉末。