巻号一覧
35 巻, 2 号
選択された号の論文の7件中1～7を表示しています
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沖本 邦郎, 佐藤 富雄, 堀石 七生1988 年 35 巻 2 号 p. 47-52
発行日: 1988/02/25
公開日: 2009/05/22
ジャーナル フリーAir-atomized Zn-22Al superplastic powder and ferromagnetic barium ferrite powder were mixed with various mixing ratio and compacted in a closed-die at room temperature or 250°C. The compacts were magnetized in a strong magnetic field and then converted into a permanent magnet. Magnetic characteristics of the composite material was almost equal to those of conventional plastic magnets. The magnetic composite material, as opposed to the conventional plastic magnets, provides essentially metallic function such as good electric conductivity and re-formability.抄録全体を表示PDF形式でダウンロード (1225K) -
1988 年 35 巻 2 号 p. 52
発行日: 1988年
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (17K) -
森下 強, 大崎 茂三, 亀井 清弘1988 年 35 巻 2 号 p. 53-57
発行日: 1988/02/25
公開日: 2009/05/22
ジャーナル フリーA powdered alloy sheet process which provides the required minimum wear-resistant layer was developed. This layer was obtained by bonding a flexible sheet formed with wear-resistant alloy powder using polymer as the binder to the sliding parts, and subsequently by heating.
By the heat stability tests made among Alkyd resin, Urethane polymer, Vinyl acetate and Acrylic resin, Acrylic resin was selected for the binder due to the superior properties without causing molding defects such as pin holes, because in the heating the resin was degenerated to the tar-pitch like material and the carbon like material, allowing superior bonding of the alloy sheet to the base steel. Especially, the sheeted powder of mixed SUS-410 and OS-23 with adding acrylic resin by 2-4 wt% was soft enough to bond to the curved parts by the sintering after the preheating. This process succeeded to apply for the cam shaft, the rocker arms and the swing arms.抄録全体を表示PDF形式でダウンロード (5287K) -
坂口 茂也1988 年 35 巻 2 号 p. 58-62
発行日: 1988/02/25
公開日: 2009/12/04
ジャーナル フリーParticularly titanium powder metallurgy is difficult because of both oxidation and carbonization on mixing and sintering process. In this work, the influence of some mixing methods and sintering conditions on some properties of Ti-30Mo sintered alloy was investigated. The results can be summarized as follows:
(1) Fluidizing type mixer may be useful in mixing titanium and other metal powders because it causes less contamination of oxygen, carbon and iron, and it needs short time for enough mixing.
(2) Mixing by fluidizing type mixer and sintering in non-carbonizing atomosphere in a vacuum improve the elongation and strength of Ti-30Mo sintered alloy.
(3) Corrosion resistance of Ti-30Mo sintered alloy against non-oxidizing acids is far better than that of pure titanium and is not influenced very much by oxygen, carbon and iron which are contaminated in both mixing and sintering process.抄録全体を表示PDF形式でダウンロード (4172K) -
金子 武1988 年 35 巻 2 号 p. 63-71
発行日: 1988/02/25
公開日: 2009/05/22
ジャーナル フリーThis report describes the density, strength, toughness and ductility variations of Tungsten Base Composites.
Composites of tungsten with additional nickel and iron (91.3-95.5%W/5.8-3.0%Ni/2.9-1.5%Fe) were fabricated by liquid phase sintering of well-grained powder (-2 μm) at 1460-1500°C in a hydrogen atmosphere.
The microstructure of liquid sintered Tungsten Base Composites consists of rounded and single crystal tungsten grains in a binder.
In order to investigate the deformation and fracture behavior of sintered Tungsten Base Composites, metallographic and fractographic examinations were performed in terms of tension test, K1c test and Charpy impact test.
Mechanical properties of the Tungsten Base Composites are as follows:
(1) The tensile strength, hardness and toughness are increased with the increase of W content and swaging rates. On the contrary, the elongation is decreased with increasing W content and swaging rates.
(2) The mechanical properties of the heavy alloys are governed by the binding energy between the tungsten-matrix phases. The weaker this binding energy is, the lower the ductility to failure. In heavy alloys the maximum elongation depends strongly upon its contiguity.抄録全体を表示PDF形式でダウンロード (7695K) -
土屋 信次郎, 鈴木 寿, 寺田 修1988 年 35 巻 2 号 p. 72-77
発行日: 1988/02/25
公開日: 2009/05/22
ジャーナル フリーTo describe the reason why the life time of WC-Co cemented carbide tools is shortened, when the tools are applied for copper or copper alloys, the interfacial reaction at 1273K between the alloy and pure copper has been studied. The results obtained are as follows; Copper atoms diffused much more in the alloy than the amount of cobalt atoms diffusing in copper. Copper rich layer formed at the interface between tungsten carbide and binder phases in the diffusion area of copper in the alloy, leading to the embrittlement of the above interface and the sharp decrease in the strength of alloy. The thickness of diffusion area or the diffusion depth of Cu was varied according to the binder and carbon contents of the alloy used.抄録全体を表示PDF形式でダウンロード (5573K) -
小堀 景一, 植木 光生, 府川 敦, 鈴木 寿1988 年 35 巻 2 号 p. 78-81
発行日: 1988/02/25
公開日: 2009/05/22
ジャーナル フリーIn a previous report of the present authors, it was shown that the cutting performance of medium carbon P30 alloy fell down by the addition of nitrogen (N). To describe the phenomenon, studies on the mechanical properties of the alloy with different grain sizes of βt (N) (WC-TiC-TiN-TaC solid solution) were undertaken, paying attention to the thermal stability at low temperature (973K).
It was noted that, when the N contained alloy was annealed at 973K, precipitation of Co3W became faster than that occurred in the usual alloy free from N, and resulted in the decrease in the mechanical properties. It was suggested that the cutting performance of N contained alloy was related to the thermal instability due to the fine structure of the βt(N) grains.抄録全体を表示PDF形式でダウンロード (1585K)
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