低温氢烧结铁磁材料的研究。2钕铁硼永磁合金

IF 0.9 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS
I. I. Bulyk, I. V. Borukh
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引用次数: 0

摘要

利用扫描电镜和x射线能谱研究了采用氢化歧化(HD)和解吸复合(DR)两种途径烧结Nd11.7Fe81.1Zr1.2B6和Nd16Fe73.9Zr2.1B8两种nd2fe14b基铁磁合金。研究了粉末研磨、粉末压实压力、氢气压力、氢气烧结第一阶段温度和真空烧结第二阶段温度与烧结材料孔隙度和显微组织粒度的关系。粉末在行星球磨机中以200转/分的速度在氢气中研磨1小时,并以2、5和6吨/平方厘米的速度压实。第一阶段烧结在氢气压力0.05 MPa、温度760℃下进行,第二阶段烧结在850℃和950℃下进行。发现粉末在第一阶段烧结。烧结材料的孔隙率随压实压力的增大而减小。烧结材料中铁磁性Nd11.7Fe81.1Zr1.2B6相的晶粒尺寸在100 ~ 300 nm之间。烧结温度降低的物理机制归因于氢诱导的相变(如歧化和复合)导致合金成分的扩散速率增加,以及在HD和dr两个阶段存在氢固溶体。本研究的一个非常重要的方面是,粉末是在生产磁各向异性材料所需的低氢压力下烧结的。分析了烧结材料性能中存在的问题,特别是微观结构的不均匀性,并提出了通过均匀化粉末粒度和优化HDDR参数(氢压力、温度、反应时间)来解决这些问题的方法。与同类技术相比,新烧结方法的工艺优势包括温度降低100°C以上,生产纳米结构各向异性材料的潜力,以及使用技术上更简单和更便宜的烧结炉。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sintering of Ferromagnetic Materials at Lower Temperatures in Hydrogen. II. Nd–Fe–B Alloys

Sintering of Ferromagnetic Materials at Lower Temperatures in Hydrogen. II. Nd–Fe–B Alloys

The use of the hydrogenation and disproportionation (HD) and desorption and recombination (DR) route (HDDR) for sintering Nd2Fe14B-based ferromagnetic alloys, such as Nd11.7Fe81.1Zr1.2B6 and Nd16Fe73.9Zr2.1B8, was studied by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The dependence between the production conditions—grinding of the alloys into powders, compaction pressure of the powders, hydrogen pressure and temperature at the first stage of sintering in hydrogen (HD), and temperature at the second stage of sintering in vacuum (DR)—and the porosity and microstructural particle size of the sintered materials was evaluated. The powders were ground in hydrogen in a planetary-ball mill at 200 rpm for 1 h and compacted at 2, 5, and 6 t/cm2. The first sintering stage was carried out at a hydrogen pressure of 0.05 MPa and a temperature of 760°C, and the second stage at 850 and 950°C. The powders were found to sinter at the first stage. The porosity of the sintered materials decreased with increasing compaction pressure. The grain size of the ferromagnetic Nd11.7Fe81.1Zr1.2B6 phase in the sintered materials ranged from 100 to 300 nm. The physical mechanism behind the reduction in the sintering temperature was attributed to an increase in the diffusion rate of alloy components resulting from hydrogen-induced phase transformations, such as disproportionation and recombination, and to the presence of a hydrogen solid solution at both stages of the process, HD and DR. A very important aspect of this research is that the powders were sintered under low hydrogen pressure required to produce magnetically anisotropic materials. Problematic aspects of the properties shown by the sintered materials, particularly microstructural heterogeneity, were analyzed, and approaches to their solution, through homogenizing the particle size of the powders and optimizing the HDDR parameters (hydrogen pressure, temperature, reaction time), were proposed. The process advantages of the new sintering method compared to similar techniques included the temperature lower by more than 100°C, the potential for producing nanostructured anisotropic materials, and the use of technically simpler and cheaper sintering furnaces.

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来源期刊
Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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