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.

采用一种新的反向旋转法制备了快速凝固铁基磁性合金粉末，并对其性能进行了研究。本文提出了一种新的雾化方法。雾化装置由一个倒T形石英喷嘴和一个直径为240 mm的酒杯形冷却盘组成。喷嘴和冷却盘都绕垂直同轴线沿相反方向旋转。喷嘴和冷却盘的最大转速为10000 rpm，离心力作用下喷出的合金液在冷却盘表面雾化并快速凝固。为了防止氧化，合金在氩气气氛中熔化和淬火。合金成分为Fe_<82>B_<18>和Nd_2Fe_<14>B，所得粉末具有良好的球形度和光滑度。小于80重量%的累积粒度分布，粒度为约10 μ m至200 μ m，粉末的平均直径为约100 μ m。冷却速率约为10^4 ~ 10^7 ℃/s。对粉末的横截面进行显微镜检查。随着粒径的减小，晶粒尺寸减小。小于约44 μ m的FeD小颗粒在结构上几乎是非结晶的。在NdFeD粉末的情况下，晶粒尺寸为约微米至亚微米。

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;