巻号一覧
20 巻, 3 号
選択された号の論文の4件中1～4を表示しています
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加瀬 薫, 伊藤 普, 三橋 靖郎1973 年 20 巻 3 号 p. 67-70
発行日: 1973/07/25
公開日: 2009/05/22
ジャーナル フリーThe authors produced ultra-fine particles by wire explosion of iron base alloy wires in air, and of titanium wire in nitrogen atmosphere. The characteristics of these particles were studied. The results obtained are as follows:
(1) The particles obtained by wire explosion of wires of mild steel, Fe-Ni alloy, permalloy, and titanium were under 0.5μ in size and spherical.
(2) With the increase of charged voltage, the particle size and the oxygen content decreased.
(3) By wire explosion of iron based alloys in air, fine particles of these oxides, Fe2O4, NiFe2O4 and NiO were obtained.
(4) By wire explosion of titanium wire in nitrogen atmosphere, TiN-TiO2 composite particles were obtained.抄録全体を表示PDF形式でダウンロード (1427K) -
黒木 英憲, 古賀 雅文, 徳永 洋一1973 年 20 巻 3 号 p. 71-79
発行日: 1973/07/25
公開日: 2009/12/04
ジャーナル フリーThis study was undertaken to examin the influence of pore filling with copper, that of an alloying reaction between iron and copper, and that of nonmetallic inclusion, on the impact properties of copper-infiltrated sintered iron.
Skeletons with the density of 6.5 g/cm3 were prepared from electrolytic (HVA-star) and reduced-ore (NC100⋅24) iron powders by means of compacting at room temperature and sintering for 1 hr at 1200°C in hydrogen. Subsequently they were infiltrated with copper powder compacts, containing 5% of iron powder, for 5/3-135 min at 1130°C in hydrogen.
Results were summarized as follows:
Filling pore with copper remarkably increased the impact strength.
As the infiltrating time increased, the amount of iron alloy containing copper increased, and necks of iron skeletons were gradually cut off, which led to the increase in tensile strength and the decrease in impact strength and elongation.
The transition from ductile to brittle appeared around room temperature. This transition temperature was not apparently changed with the properties of iron powders used for skeletons, but slightly increased with infiltrating time.
The impact strength of copper-infiltrated iron compacts made from reduced-ore powder was much lower than that of the compacts from electrolytic, largely due to its higher content of nonmetallic inclusions.抄録全体を表示PDF形式でダウンロード (6774K) -
大森 慎一郎, 橋本 雍彦1973 年 20 巻 3 号 p. 80-86
発行日: 1973/07/25
公開日: 2009/12/04
ジャーナル フリーStandard free energies of formation of Ni3B (ΔG°, Ni3B) and Ni2B (ΔG°Ni2B) were determined by E. M. F. measurements of the cells;
‹Pt› O2 in air |ZrO2⋅Cao| Ni-22 at %B alloy powder, B2O3 ‹Pt› (for Ni3B)
and
‹Pt› O2 in air |ZrO2⋅CaO| Ni-32 at %B alloy powder, B2O3 ‹Pt› (for Ni2B).
Standard enthalpies and entrppies of formation of Ni3B and Ni2B were calculated by applying Gibbs-Helmholtz's equations to these ΔG°Ni3B and ΔG°Ni2B values, respectively.
The results obtained are as follows:
ΔG°Ni3B=-31, 720+10.56T±200 cal/mol
ΔH°Ni3B=-31, 720 cal/mol
ΔS°Ni3B=-10.56 cal/mol, °K
}(975-1225°K)
and
ΔG°Ni2B=-25, 604+7.24T±200 cal/mol
ΔH°Ni2B=-25, 604 cal/mol
ΔS°Ni2B=-7.24 cal/mol, °K
}(1050-1200°K)抄録全体を表示PDF形式でダウンロード (463K) -
渡辺 〓尚, 金沢 充1973 年 20 巻 3 号 p. 87-88
発行日: 1973/07/25
公開日: 2009/05/22
ジャーナル フリーDuring sintering of porous compacts made from aluminum-copper mixed powders, an eutectic alloy of Al-33% Cu appearing by the alloying reaction between copper and aluminum powders melts away over the eutectic temperature (548°C), and spreads into inherent voids in the compacts. New coarse pores consequently appear at the position of the copper powders. Thereupon, the new pores are called "melt-off pores."
It is an aim of the anthers to show the results of observations on the melt-off pores of sintered aluminum-5%copper compacts by the use of Scanning Electron Microscope.抄録全体を表示PDF形式でダウンロード (1544K)
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