Preparation and Property Evalution of Ultrafinegrained Materials by Ultra-High Pressure Sintering

超高压烧结超细晶材料的制备及性能评价

• 批准号: 02452238
• 负责人: HAYASHI Koji
• 金额: $ 3.07万
• 依托单位: The University of Tokyo, Institute of Industrial Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452238/
• 关键词: Ultrafine Powder; Fine Grain; Micro Grain; Pressure Sintering; Hardness; Elevated Temperature; Creep; 焼結; 極微細組織; クリ-プ変形; 鉄; コバルト; ニッケル; 超微細粒; 緻密化

The hot-pressing condition for complete densification of Co+Ni and Fe+Co+Ni mixed ultrafine powders (0.02 ; mum), the average crystal grain size and hardness (Hv) of the sintered compacts were investigated (Research I) and the effect of test temperature on the hardness (Hv) of ultrafinegrained sintered compacts with the average crystal grain size of 0.10 0.35mum was investigated for Fe, Co, Ni, Fe-Co, Fe-Ni, Go-Ni and Fe-Co-Ni systems (Research II). The results obtained were as follows. Research I ; (1) The complete densification temperatures for Fe+Co+Ni mixed powders, for example at 400 MPa, was about 200-300K higher than those (500-800K) of Fe, Co and Ni powders, and about 100K higher than those of Co+Ni, Fe+Co and Fe+Ni powders. (2) The minimum crystal grain size of the Co-Ni and Fe-Co-Ni sintered compacts were 0.18 and 0.12 um respectively ; the crystal grain size under the same hot-pressing condition tended to decrease with the number of components, in accordance with the tendencies of both the homogenization temperature of the components and the densification temperature. (3) The maximum hardness of Co-Ni and Fe-Co-Ni sintered compacts were about 600 and 800 Hv. Research II ; . (1) The order of Hv observed at room temperature among the alloy systems did not change in general at the higher test temperatures. (2) The Hv of Fe fine-grained compacts decreased sharply at about 500K, which was much lower than that (about 800K) for coarse-grained compacts of 3.5um. This was attributed to the fact that creep deformation easily occurs even at such low temperatures for fine-grained compacts.

Co+Ni和Fe+Co+Ni混合超细粉完全致密化的热压条件（0.02 ;研究了烧结体的平均晶粒尺寸和硬度（Hv（研究I）和试验温度对平均晶粒尺寸为0.10 - 0.35 μ m的超细晶烧结体的硬度（Hv）的影响进行了研究，Fe-Co、Fe-Ni、Go-Ni和Fe-Co-Ni体系（研究II）。获得的结果如下。研究I ;（1）Fe+Co+Ni混合粉末的完全致密化温度比Fe、Co和Ni粉末的完全致密化温度（500- 800 K）高200- 300 K，比Co+Ni、Fe+Co和Fe+Ni粉末的完全致密化温度高100 K左右。(2)Co-Ni和Fe-Co-Ni烧结体的最小晶粒尺寸分别为0.18和0.12 μ m;在相同热压条件下，晶粒尺寸随组分数量的增加而减小，这与组分均匀化温度和致密化温度的变化趋势一致。(3)Co-Ni和Fe-Co-Ni烧结体的最大硬度分别为600和800 Hv。研究二; (1)在室温下观察到的合金系统之间的Hv的顺序一般在较高的测试温度下没有变化。(2)Fe细晶压坯的Hv在500 K左右急剧下降，远低于3.5 μ m粗晶压坯的Hv（800 K左右）。这是由于细晶粒压坯即使在如此低的温度下也容易发生蠕变变形。

项目成果

藤内 秀人,林 宏爾: "Co+Ni,Fe+Co+Ni混合超微粉の加圧焼結および焼結体の粒度と硬さ" 粉体および粉末冶金. 38. 482-485 (1991)

Hideto Fujiuchi、Hiroji Hayashi：“Co+Ni、Fe+Co+Ni 混合超细粉末的加压烧结及烧结体的粒度和硬度”《粉末与粉末冶金》38. 482-485 (1991)。

藤内 秀人、林 宏爾: "Co+NiとFe+Co+Ni混合超微粉の加圧焼結と焼結体の粒度と硬さ" 粉体および粉末冶金. 38. (1991)

Hideto Fujiuchi、Hiroji Hayashi：“Co+Ni 和 Fe+Co+Ni 混合超细粉末的压力烧结以及烧结体的粒度和硬度”《粉末与粉末冶金》38。（1991）

藤内 秀人,林 広爾: "Fe,Co,Ni単成分および混合超微粉焼結体の硬さの試験温度依存性" 粉体および粉未冶金. 38. 854-857 (1991)

Hideto Fujiuchi、Hiroji Hayashi：“测试 Fe、Co、Ni 单组分和混合超细烧结体硬度的温度依赖性”粉末和粉末冶金。 38. 854-857 (1991)

HIDEHITO FUJIUCHI AND KOJI HAYASHI: "Hot-Pressing of Co+Ni and Fe+Co+Ni Mixed ultrafine Powders and Grain Size and Hardness of Sintered Compact" J. Japan Inst. Powder Met.38. 482-485 (1991)

HIDEHITO FUJIUCHI 和 KOJI HAYASHI：“Co Ni 和 Fe Co Ni 混合超细粉末的热压以及烧结体的晶粒尺寸和硬度”J. Japan Inst.

藤内 秀人,林 広爾: "Co+Ni,Fe+Co+Ni混合超微粉の加圧焼結および焼結体の粒度と硬さ" 粉体およ粉未冶金. 38. 482-485 (1991)

Hideto Fujiuchi、Hiroji Hayashi：“Co+Ni、Fe+Co+Ni 混合超细粉末的加压烧结及烧结体的粒度和硬度”粉末与粉末冶金学 38. 482-485（1991）。