Formation of bulk material of metastable phase by solid-state reaction of complex ultra fine powders.

通过复杂超细粉末的固相反应形成亚稳相块体材料。

基本信息

  • 批准号:
    63460197
  • 负责人:
  • 金额:
    $ 3.52万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
  • 财政年份:
    1988
  • 资助国家:
    日本
  • 起止时间:
    1988 至 1989
  • 项目状态:
    已结题

项目摘要

In the present investigation the sintering of matal ultra fine powders have been studied for two years. This study was characterized by the fact that the ultra fine powders were handled in one continuous equipment from production to sintering. Especially using the inert gas cleaning system obtained by the present grant, the O_2 and moisture content was kept in quite low state. The main results obtained were as follows.1. The inert gas cleaning system, O_2 and H_2O detectors were censer attached to the grove box and this grove box was directly connected with the ultra fine powder producing system.2. The diamer of ultra fine powder was reduced with reducing the chamber pressure and the material powder feeding rate.3. The density of sintered ultra fine powder at the same sintering temperature was higher when sintered under the pressure than that without pressure at the same sintering temperature. The sintering temperature which gives the same sintering density was 200K lower when sintered … More for that under pressure (300MPa) than that without pressure.4. The hardness of sintered ultra fine powder increases with the progress of sintering and decrease with the progress of grain growth. The maximum hardness obtained was 50OHv for Ni and 25OHv for Cu, which were 7 and 4 nines larger than those of casted.5. The hardness of sintered ultra fine powders was proportional to -1/2 power of the grain size and this indicates that the Hall-Petch relation is held.6. The theoretical consideration of the effect of grain size to the sintering rate and grain growth rate indicates that the temperature region where sintering rate is high and grain growth rate is low increases with the decrease in grain size.7. The mixing of different ultra fine powders after production of each powder was tried using ultrasonic equipment. However microscale mixing was not achieved because of the aggregation. To obtain uniform mixing the best method wascon sidered to mix the material in the vapor condition. A new type double plasma touch ultra fine powder production system was designed. Less
本研究对金属超细粉的烧结进行了两年的研究。该研究的特点是超细粉体从生产到烧结在一个连续的设备中处理。特别是采用本课题组研制的惰性气体清洗系统,可将氧气和水分保持在较低的状态。主要研究结果如下:1.惰性气体净化系统、O_2和H_2O检测器与格罗夫箱相连,格罗夫箱与超细粉体生产系统直接相连.降低反应室压力和原料粉进料速率,可以减小超细粉体的粒径.在相同烧结温度下,加压烧结的超细粉体密度高于无压烧结的超细粉体密度。在相同烧结密度条件下,烧结温度降低了200 K ...更多信息 压力(300 MPa)下的热稳定性比无压力下的好.烧结超细粉体的硬度随烧结过程的进行而增大,随晶粒长大而减小。镍和铜的最大硬度分别为500 Hv和250 Hv,比铸态分别高出7个和4个9.烧结超细粉末的硬度与粒度的-1/2次方成正比,这表明存在Hall-Petch关系。6.从理论上考虑了晶粒尺寸对烧结速率和晶粒生长速率的影响,结果表明,随着晶粒尺寸的减小,烧结速率高而晶粒生长速率低的温度区域增大.在制备每种粉末后,使用超声设备尝试混合不同的超细粉末。然而,由于聚集,没有实现微尺度混合。为了获得均匀的混合,最好的方法被认为是在蒸汽条件下混合材料。设计了一种新型双等离子体接触式超细粉体制备系统。少

项目成果

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UMEMOTO Minoru其他文献

UMEMOTO Minoru的其他文献

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{{ truncateString('UMEMOTO Minoru', 18)}}的其他基金

Microstructure control by HPT deformation to improve strength and toughness of austenitic stainless steels
通过 HPT 变形控制显微组织以提高奥氏体不锈钢的强度和韧性
  • 批准号:
    24360306
  • 财政年份:
    2012
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Strengthening and toughening of metallic materials by size invariant deformation with an ultra large strain gradient and the clarification of its mechanism
超大应变梯度尺寸不变变形金属材料强韧化及其机理的阐明
  • 批准号:
    20246103
  • 财政年份:
    2008
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
The quantitative evaluation of effect of strain gradient on the strengthening and structure refinement of metals during ultra large straining
超大应变过程中应变梯度对金属强化和组织细化作用的定量评价
  • 批准号:
    18360329
  • 财政年份:
    2006
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study on the formation mechanism of nanocrystalline structure by severe plastic deformation and analysis of its structure in atomic scale
剧烈塑性变形纳米晶结构形成机理研究及其原子尺度结构分析
  • 批准号:
    14205103
  • 财政年份:
    2002
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Development of environmental conservation type thermoelectric device of silicide compounds and their power generation modules
环保型硅化物热电器件及其发电模块的研制
  • 批准号:
    13555188
  • 财政年份:
    2001
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Research on the properties of bulk cementite prepared by mechanical alloying
机械合金化制备大块渗碳体的性能研究
  • 批准号:
    12450281
  • 财政年份:
    2000
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Formation of Fullerene Alloys by Mechanical Alloying and its Characterization
机械合金化富勒烯合金的形成及其表征
  • 批准号:
    09450271
  • 财政年份:
    1997
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Designing of the formation process of recyclable eco-steels
可回收生态钢的形成工艺设计
  • 批准号:
    07555658
  • 财政年份:
    1995
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Development of Formation Technique and Chracterization of Nanocrystal Material form Ultra Fine Powder and MA Process
超细粉体纳米晶材料的形成技术和表征及MA工艺的发展
  • 批准号:
    02805085
  • 财政年份:
    1990
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

相似海外基金

Ultra-fine grain formation and reinforcement orientation mechanism of Ti matrix composites in hot working
Ti基复合材料热加工超细晶粒形成及强化取向机制
  • 批准号:
    23K13579
  • 财政年份:
    2023
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Early-Career Scientists
Development of ultra-fine-grain tungsten coating on the first wall by electron beam irradiation processing
电子束辐照加工第一壁超细晶钨涂层的研制
  • 批准号:
    23656577
  • 财政年份:
    2011
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Development and Strength Evaluation of Ultra-fine Grain α-brass for Micromachines
微型机械用超细晶α-黄铜的研制及强度评价
  • 批准号:
    20560076
  • 财政年份:
    2008
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Reduction of Grain boundary energy to stabilize ultra-fine grain structure produced by severe plastic deformation
降低晶界能以稳定剧烈塑性变形产生的超细晶粒结构
  • 批准号:
    19560711
  • 财政年份:
    2007
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
A study on embrittlement and fatigue behavior of ultra-fine grain crystals under corrosive environment
腐蚀环境下超细晶晶体的脆化与疲劳行为研究
  • 批准号:
    13650767
  • 财政年份:
    2001
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
U.S.-Japan Cooperative Science: Development of Materials with Ultra-Fine Grain Sizes
美日合作科学:开发超细晶粒材料
  • 批准号:
    9602919
  • 财政年份:
    1997
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Standard Grant
Ultra-Fine Grain Steel Produced by Carbide Dispersion Carburizing Process
碳化物弥散渗碳工艺生产的超细晶粒钢
  • 批准号:
    62850129
  • 财政年份:
    1987
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research
Studies on Ultra Fine Grain Steel Sheet with High Speed High Strain Hot Rolling and Rapid Cooling Method.
超细晶粒钢板高速高应变热轧及快冷方法的研究。
  • 批准号:
    59420040
  • 财政年份:
    1984
  • 资助金额:
    $ 3.52万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (A)
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