巻号一覧
61 巻, 10 号
October
選択された号の論文の6件中1～6を表示しています
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研究論文
受賞記念講演
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加藤 欽之2014 年 61 巻 10 号 p. 465-472
発行日: 2014/10/15
公開日: 2014/11/25
ジャーナル オープンアクセスThe history of metal powder raw materials in the powder metallurgy is powder about average particle size 70 µm represented by − 100 Mesh. A metal powder mass productions technology less than average particle size 10 µm progressed in the past 3 decades. By the progress of this fine metal powder production technology, the new PM technology and use that conventional − 100 Mesh powder did not have were able to open. I survey the present conditions and the future in the field of powder metallurgy of this new Fine powder here.抄録全体を表示PDF形式でダウンロード (1441K)
研究論文
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品川 一成, 森岡 篤志, 水口 隆, 田中 康弘, 大久保 健児, 岩津 修, 田中 茂雄2014 年 61 巻 10 号 p. 473-480
発行日: 2014/10/15
公開日: 2014/11/25
ジャーナル オープンアクセスIt may be important to elucidate the mechanism of grain growth during the early stage of sintering, especially for micro-scale sintered products, of which size is close to that of powder particles. This study aims to clarify the grain growth behavior in powder compacts, that is, porous bodies. Sintering experiments of the powder compacts with polycrystalline nickel particles were conducted in temperatures lower than usual, for long time, and the change in crystal grain size were revealed by electron backscatter diffraction analysis in a scanning electron microscope. It was found that the crystal grain size increased, but did not go over the size of powder particles in the case of sintering at the lower temperatures. A phase-filed simulation of sintering process for two polycrystalline particles was also performed to examine the effects of neck growth on grain boundary migration. It was confirmed that the two polycrystalline particles of equal-size became two single-crystal grains when the sintering shrinkage rate was set to be low, which may be correspond to the experimental results at the lower temperatures.抄録全体を表示PDF形式でダウンロード (1434K) -
山口 拓人, 萩野 秀樹, 武村 守, 中平 敦2014 年 61 巻 10 号 p. 481-486
発行日: 2014/10/15
公開日: 2014/11/25
ジャーナル オープンアクセスTitanium and its alloys have various excellent properties, such as good corrosion resistance and high specific strength. However, they have not been applied to the sliding parts under sever wear condition due to their poor tribological properties.
In this study, laser alloying using graphite powder was carried out to form Ti/TiC composite surface layer on commercial pure titanium substrate for improving wear resistance. The effects of graphite powder size and laser irradiation parameters on the microstructure of laser alloyed zone were mainly investigated. In the laser alloyed zone, dendritic primary TiC and fine particles of eutectic TiC were observed. In the condition of higher laser traverse speed and larger size of graphite powder, undissolved graphite particles were observed.抄録全体を表示PDF形式でダウンロード (1286K) -
白石 祐太郎, 水野 雄太, 木村 光, 日比野 敦2014 年 61 巻 10 号 p. 487-495
発行日: 2014/10/15
公開日: 2014/11/25
ジャーナル オープンアクセスIn this paper, for Fe, Fe–3%Cr, Fe–4%Ni, Fe–Cr–Ni (SUS304L), and Fe–1.5%Mo alloyed steel powders,adsorption and desorption behaviors of water were investigated. The compacts made from the powders were heated in a steam pot for 60minutes, and were dried in an air-conditioned room. Additionally, the mass changes were measured accurately.
In case of Fe–Cr–Ni (SUS304L) and Fe–3%Cr powders, the weight of the compacts increased with steam treatment. The weight of the compacts returned again to initial weight by drying in the air-conditioned room. However, in case of Fe–4%Ni and Fe–1.5%Mo powders, in spite of the steam treatment, the weight decreased rather than the starting of the steam treatment. Furthermore, the weight did not return to the initial weight by drying. It is said that water molecule adsorbed physically or chemically on powder surface. In case of Fe–Cr–Ni (SUS304L) and Fe–3%Cr powders, it is thought that the water molecule adsorbed physically on the powder because the weight returned to the initial weight. However, in case of Fe–4%Ni and Fe–1.5%Mo powders, the weight did not return to initial weight. Therefore, it is thought that the water molecule adsorbed chemically. Furthermore, the water release behavior from the powders were measured by a gas-chromatograph analyzer.抄録全体を表示PDF形式でダウンロード (1943K)
本会記事
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2014 年 61 巻 10 号 p. Pref10_1-
発行日: 2014/10/15
公開日: 2014/11/25
ジャーナル オープンアクセスPDF形式でダウンロード (621K) -
2014 年 61 巻 10 号 p. Mtg10_2-
発行日: 2014/10/15
公開日: 2014/11/25
ジャーナル オープンアクセスPDF形式でダウンロード (312K)
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