Magnetic Alloy Powders fabricated by a New Counterrotating Rapidly Quenching Method and Related Powder Properties

新型反向旋转快速淬火方法制备磁性合金粉末及相关粉末性能

• 批准号: 61850053
• 负责人: YAGI Masaaki
• 金额: $ 2.37万
• 依托单位: Miyagi National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61850053/
• 关键词: Magnetic alloy powder; New counterrotating method; 超急冷磁性合金微粉末; アトマイズ粉末の製造; 加熱冷却二系統回転法

Rapidly solidified Fe based magnetic ally powders were fabricated by a new counterrotating method and the powder properties were investigated. This new atomizing method was develpod by the authors in this work. The atomizing apparatus consisits of a inverse T shaped quartz nozzle for ejecting molten alloys and a wine-cup shaped cooling disk with a diameter of 240mm. Both the nozzle and the cooling disk were rotated in opposite direction about a vertical coaxial. The maximum revolving speed of the nozzle and the disk was 10000 rpm.The molten alloy ejected by centrifugal force was atomized and solidified rapidly on the surface of the cooling disk. The alloys were melted and quenched in Ar gas atomospere in order to avoid oxidation. The compositions of alloys were Fe_<82>B_<18> and Nd_2Fe_<14>B.The powders obtained had good sphericity and smoothness. Less than 80% of the cumulative size distribution by weight, the particle size was about 10 m to 200 m and the average diameter of powders was about 100 m. The cooling rate was about 10^4゜C/s to 10^7゜C/s. Microscopic examination made on the cross section of powders. The grain size decreased with decrease of the particle diameter. Small particles of FeD less than about 44 m was almost non-crystalline in structure. In the case of NdFeD powders, the grain size was about microns to submicrons.

通过一种新的对抗方法制造了快速固化的Fe基磁性盟友粉末，并研究了粉末性能。在这项工作中，这项新的雾化方法是作者的发展。雾化设备由一个反向T形石英喷嘴组成，用于弹出熔融合金和直径为240mm的酒杯形冷却盘。喷嘴和冷却盘都沿相反的方向旋转，垂直同轴。喷嘴和磁盘的最大旋转速度为10,000 rpm。离心力弹出的熔融合金被雾化并迅速在冷却盘的表面上固化。将合金融化并在AR气体架中淬灭，以避免氧化。合金的组成为Fe_ <82> B_ <18>和ND_2FE_ <14> B.获得的粉末具有良好的球形和光滑度。不到累积尺寸分布的80％，粒径约为10 m至200 m，粉末的平均直径约为100 m。冷却速率约为10^4 c/s至10^7 c/s。微观检查在粉末的横截面上进行。晶粒尺寸随着颗粒直径的降低而降低。小于约44 m的小颗粒在结构上几乎是非晶体的。对于NDFED粉末，晶粒尺寸大约是微米的微米。

项目成果

Koichi TANNO: Proc.SINTERING '87,.

Koichi TANNO：Proc.SINTERING 87，。

Koichi TANNO,; Masaaki YAGI.: "Rapidly Solidified Powder Produced by Counterrotating Process" Proc. SINTERING'87. (1988)

丹野浩一；

丹野浩一,八木正昭: 粉体粉末冶金協会62年度春季大会講演集. (1987)

Koichi Tanno，Masaaki Yagi：粉末冶金协会第 62 届春季会议论文集（1987 年）。

八木正昭: 電気学会マグネティクス研究会資料.

Masaaki Yagi：IEEJ 磁学研究组材料。

Massaki YAGI,; Koichi TANNO,; Ryoji NAKAYAMA.: "Magnetic Alloy Powders Produced by Counterrotating Quenching Method" Papers on Technical Meeting on Magnetics, IEE Japan.(1988)

八木正崎;