Development of Rere-Earth Iron based hard magnetic thin films with high energy products

高能积稀土铁基硬磁薄膜的研制

基本信息

  • 批准号:
    07555652
  • 负责人:
  • 金额:
    $ 0.51万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    1995
  • 资助国家:
    日本
  • 起止时间:
    1995 至 1996
  • 项目状态:
    已结题

项目摘要

The trend of miniaturizing electronic devices has lead to a demand for higher performance permanent magnets. Nanocomposite magnets are one such candidate, that are anticipated to exhibit higher energy products. In this project, the preparation of Nd-Fe-B thin films has been studied. The magnetic properties and the microstructure of the films prepared under various conditions, have been investigated.Thin films were made on glass substrates by flash deposition, with tungsten wires as the heat source. The homogenized Nd_<2.1> Fe_<14> B alloy was crushed into a powder which was used for vacuum deposition. An image furnace was used for the post-deposition heat treatment. The microstructures of the films were investigated by XRD,SEM-EDX,and AES,and the magnetic properties were measured using a VSM.The films prepared without a post-deposition heat treatment, were amorphous-like in state because no XRD peaks were observed. Although a heat tretment effectively crystallizes the films, it introduces many cracks which are caused by the difference in thermal expansion between the substrate material and the film. These cracks can be lead to oxidation within the films. Coating the surface of the films with several defferent materials was tried, with the result that a Ti coating was found to be most effective in preventing cracks and oxidation.Since the boron content of the films was extremely low after flash deposition, the Nd_2Fe_<17> phase appeared after heat treatment, rather than Nd_2Fe_<14>B which is the main phase of the original ingot. The decrease in boron content is due to a reaction with the tungsten filaments, which are used as the heat source for deposition. However, pre-coating the substrate with fine boron powder was found to be an effective method of compensating for this loss in boron.When the substrate temperatures were below 500゚C,amorphous Fe, and Nd phases formed, while the Nd_2Fe_<14>B phase appeared at temperatures above 650゚C.
电子设备的小型化趋势导致了对更高性能永磁体的需求。纳米复合磁体就是这样的候选者之一,预计将表现出更高的能量产物。本项目主要研究Nd-Fe-B薄膜的制备。研究了不同条件下制备的薄膜的磁性能和微观结构。将均匀化后的Nd_<2.1>Fe_<14>B合金粉碎成粉末,用于真空沉积。使用成像炉进行沉积后热处理。用XRD、SEM-EDX和AES分析了薄膜的微观结构,用VSM测量了薄膜的磁性能。由于没有观察到XRD峰,所以没有经过沉积后热处理的薄膜为类非晶态。虽然热处理有效地使薄膜结晶,但它引入了许多裂纹,这些裂纹是由基底材料和薄膜之间的热膨胀差异引起的。这些裂纹可能导致膜内的氧化。由于快速沉积后薄膜中硼含量极低,热处理后薄膜中出现了Nd_2Fe_3<17>相,而不是<14>原来铸锭中的主相Nd_2Fe_ B。硼含量的降低是由于与用作沉积热源的钨丝的反应。当衬底温度低于500 ℃时,形成非晶Fe和Nd相,而当衬底温度高于650 ℃时,出现Nd_2Fe_<14>B相。

项目成果

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NAKAMURA Hajime其他文献

NAKAMURA Hajime的其他文献

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{{ truncateString('NAKAMURA Hajime', 18)}}的其他基金

Relationship between cortical spreading depression (CSD) and high mobility group box 1 (HMGB1) as synergistic deteriorating factors in cerebral ischemia.
皮质扩散抑制 (CSD) 和高迁移率族蛋白 1 (HMGB1) 作为脑缺血协同恶化因素之间的关系。
  • 批准号:
    15K10301
  • 财政年份:
    2015
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Development of new method detecting redox regulation against oxidative stress
开发检测氧化应激氧化还原调节的新方法
  • 批准号:
    23390152
  • 财政年份:
    2011
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Development of a novel method to measure unsteady heat transfer caused by flow turbulence using infrared thermography
开发一种利用红外热成像测量湍流引起的不稳定传热的新方法
  • 批准号:
    22560214
  • 财政年份:
    2010
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Imaging of regional cerebral blood flow in the surrounding of cerebral infarction using laser speckle flowmetry system
激光散斑血流仪对脑梗死周围局部脑血流成像
  • 批准号:
    21791357
  • 财政年份:
    2009
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
ANALYSIS OF MOLECULAR MECHANISMS WHEREBY THIOREDOXIN TRASNGENIC MICE ARE RESISTANT TO INFLAMMATION AND STRESS
硫氧还蛋白转基因小鼠抗炎症和应激的分子机制分析
  • 批准号:
    14370074
  • 财政年份:
    2002
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Research on brain hypothermia for neonatal hypoxic-ischemic brain damage
脑低温治疗新生儿缺氧缺血性脑损伤的研究
  • 批准号:
    12470215
  • 财政年份:
    2000
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Analysis of molecular mechanisms on cytoprotective effect of thioredoxin for host defense and aging prevention
硫氧还蛋白对宿主防御和衰老预防的细胞保护作用的分子机制分析
  • 批准号:
    12670113
  • 财政年份:
    2000
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Molecular genetic study on G6PD deficiency in Philippines
菲律宾 G6PD 缺乏症的分子遗传学研究
  • 批准号:
    11691210
  • 财政年份:
    1999
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Study on the characteristic plasticity and preventive mechanisms against neonatal brain damage.
新生儿脑损伤特征可塑性及预防机制研究
  • 批准号:
    09470241
  • 财政年份:
    1997
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study on the effects of nitric oxide on cerebral blood flow in developmental brain.
一氧化氮对发育期大脑脑血流影响的研究
  • 批准号:
    07457244
  • 财政年份:
    1995
  • 资助金额:
    $ 0.51万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)

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Basic study of magnetic transcription of high-performance magnetic thin films by applying electric field to ferromagnetic and ferroelectric thin films
通过对铁磁和铁电薄膜施加电场来实现高性能磁性薄膜磁转录的基础研究
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SELF-ASSEMBLY AND PATTERN FORMATION IN MAGNETIC THIN FILMS
磁性薄膜中的自组装和图案形成
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femto second imaging of magnetic thin films using laser photoemission microscope
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