巻号一覧
45 巻, 8 号
選択された号の論文の14件中1～14を表示しています
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焼結体の気孔率制御と内部組織冨野 寿和, 近藤 祥人, 藤村 宗英, 東城 哲朗1998 年 45 巻 8 号 p. 703-708
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーWe studied the pulse electric current sintering behavior of the atomized cast-iron powder of Fe-C system containing hypo-eutectic carbon and the microstructures of sintered bodies. The results were as follows:
(1) The porosity control of the atomized cast-iron sintered body, which was very difficult by the vacuum sintering method, could be done by the pulse electric current sintering method with several sintering conditions, that is, the sintering temperature and the sintering pressure.
(2) The microstructure of the sintered body was depending on the sintering temperature, and was independent of the sintering pressure.抄録全体を表示PDF形式でダウンロード (5609K) -
アトマイズ鋳鉄粉末多孔質焼結体のヤング率冨野 寿和, 近藤 祥人, 藤村 宗英, 東城 哲朗1998 年 45 巻 8 号 p. 709-714
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーThe Young's moduli of the atomized cast-iron porous sintered bodies, which were made by the vacuum sintering method and the pulse electric current sintering method, were measured by the grind-sonic method. And, we discussed the relationship of the Young's modulus and the relative density of the atomized cast-iron porous sintered body taking into account of the microstructure. The results were as follows:
(1) The Young's modulus of the vacuum sintered body was governed by the porosity and the pore shape.
(2) The Young's modulus of the pulse electric current sintered body was dependent on the porosity, and independent on the carbon content, the particle size and the sintering condition. (3) The Young's modulus of the pulse electric current sintered body was smaller than that of the vacuum sintered body at same porosity.抄録全体を表示PDF形式でダウンロード (5415K) -
アトマイズ鋳鉄粉末多孔質焼結体の強度特性冨野 寿和, 近藤 祥人, 藤村 宗英, 東城 哲朗1998 年 45 巻 8 号 p. 715-720
発行日: 1998/08/15
公開日: 2010/07/12
ジャーナル フリーThe relationships between the bending strength and the relative density in the atomized cast-iron porous sintered bodies, which were made by the vacuum sintering method and the pulse electric current sintering method, were studied. The results were as follows:
(1) In the vacuum sintered body, the bending strength depended on the carbon content of powder. The bending strength of both the relative density over 65% of Fe-2.46mass%C compact and the relative density over 90% of Fe-3.96mass%C compact were dependent on the particle size, and the bending strength of the sintered body made from small size powder was larger than that of made from large size powder.
(2) In the pulse electric current sintered body, the bending strength did not depend on the particle size, the carbon content and the sintering condition.
(3) In the relative density range from 60% to 90%, the bending strength of the vacuum sintered body was larger than that of the pulse electric current sintered body. Over the relative density 90%, the bending strength of the pulse electric current sintered body was larger than that of the vacuum sintered body. In the low relative density range (60-90%), the bending strength was affected by the pore shape. However, in the high relative density range (90%-), the bending strength was influenced by the size of Fe3C.抄録全体を表示PDF形式でダウンロード (2469K) -
国枝 義彦, 花田 富貴子, 下古谷 博司, 井上 哲雄, 兼松 秀行1998 年 45 巻 8 号 p. 721-726
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーTa has been mainly used for capacitor. Recently, electrolytic capacitor of Ta has been demanded to be smaller size and higher performance. But, there is few reports about sintering of Ta. Then, in this work, the sintering behaviors and the capacitance. of porous Ta sintered by capsule free HIP sintering and vacuum sintering about two kinds of Ta powders with different particle size of 1.7μm (No.A) and 3.5μm (No.B), were discussed. The relative density of sintered Ta compact was independent on particle size of starting powder and increased with an increase in sintering temperature and sintering time. The coarsening of grain increased markedly in the compact sintered from smaller particles as compared to the compact from larger particles. The capacitance of sintered compact from No.A was larger than that from No.B. Tans of No.B was smaller than that from No.A.抄録全体を表示PDF形式でダウンロード (4540K) -
安宍 善史, 谷地 善光, 千葉 茂樹, 長田 洋, 関 享士郎1998 年 45 巻 8 号 p. 727-732
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーUp to now, the both of bulk and thick film as a temperature-sensitive substance have been provided. However, the sensitivity of these substances with a large heat capacity are low level for minute temperature detection. The development of a thin film following the tendency of a miniaturization and lightweight of an electronic system has been required. Present authors investigated a method of fabricating temperature-sensitive magnetic thin-film device (TMT) via an annealing treatment after the sputtering of a temperature-sensitive ferrite with low Curie temperature as a target. The method has two step profile: after depositing metal components of a temperature-sensitive ferrite on the substrate by sputtering, a high temperature annealing treatment is performed pouring argon gas, as result a ferrite thin film (thickness: 1.5μm) with spinel structure can be prepared. TMT reproduced faithfully a component of a temperature-sensitive ferrite has the remarkable temperature dependence and a small heat capacity, so responds sharply to a minute temperature variation. Therefore, TMT is expected to be applied to a pyro-magnetic sensor, a biosensor as well as an enzyme sensor.抄録全体を表示PDF形式でダウンロード (1485K) -
新野 真紀子, 岡村 寛志, 朴 容浩, 宮島 雅史, 渡辺 龍三1998 年 45 巻 8 号 p. 733-737
発行日: 1998/08/15
公開日: 2009/12/04
ジャーナル フリーThe key to improving the thermoelectric figure of merit of Si-Ge sytem is to reduce the thermal conductivity. Alloy powder with grain size of 20-30nm was prepared by mechanical alloying. The amounts of boron was varied to achieve optimum carrier concentration. The thermoelectric properties of the hot-pressed Si-Ge alloys were measured in the temperature range from 300 K to 1073 K.
The sintered Si-Ge compact was found to have a fine grain structure of about 200 nm. As a consequence, a reduction in thermal conductivity of up to 30% was achieved compared to conventional p-type alloy. A maximum figure of merit of 9×10-4K-1was obtained at 1073K.抄録全体を表示PDF形式でダウンロード (1960K) -
木村 久道, 井上 明久, 笹森 賢一郎, 河村 能人, 大野木 輝明, 喜多 和彦1998 年 45 巻 8 号 p. 738-743
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーP/M AI-Cr-Ce and AI-Cr-Mm (misch metal) base alloys were prepared by extruding their alloy powders with particle sizes below 25μm and 75μm, respectively. The ultimate tensile strength (σUTS), plastic elongation (εp) and Vickers hardness (Hv) of the P/M Al-Cr-R (R=Ce, Mm) alloys were measured at room-temperature as a function of extrusion temperature ranging from 523 K to 723 K. The σUTS, Hv decease and εp increases with increased extrusion temperature. The σUTS and εp were 592 MPa and 7.3 %, respectively, for the P/M Al94.5Cr3Ce1Co1.5 alloy and 775 MPa and 2%, respectively, for the P/M Al93.5Cr3Ce1Co1.5Mn1 alloy. The σUTS remained almost unchanged by the substitution of Mm for Ce. The σUTS, εp, Young's modulus (E) and Hv of the P/M Al94Cr3Mm1Mn1Ti1 alloy were 625 MPa, 3.3 %, 88 GPa and 190, respectively, at room-temperature and the σUTS, σ0.2 and εp at 473 K were 403 MPa, 385 MPa and 2.5 %, respectively.抄録全体を表示PDF形式でダウンロード (416K) -
佐野 三郎, 服部 恭子, 堀田 裕司, 伴野 巧, 小田 喜一1998 年 45 巻 8 号 p. 744-748
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーThis study is concerned with the fabrication of engineering ceramics parts with complicated shape by using slip casting process. To improve the density of green body, slip cast formed low soda alumina green body has been CIP treated. The improvement of the density by 150MPa-5min CIP treatment was about 1% for dried body and about 3% for as formed wet body. By the measurement of pore size distribution for CIP treated green bodies, it was shown that large pores (similar size of starting powder of low soda alumina) were smashed and small pores were shrunk. Some cracks were observed in the sintered body that is CIP treated for dried body, and the sample showed low bending strength. From these results, it is thought that high density green body and high strength sintered body is obtained from a green body that is CIP treated for as slip cast formed wet body.抄録全体を表示PDF形式でダウンロード (397K) -
山崎 道夫, 坂本 吉行, 落合 鍾一, 新井 隆, 小山 正人1998 年 45 巻 8 号 p. 749-753
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーIt is known that Ni and Al powders can be reactively sintered to form Ni3Al at around 700°C. It was attempted, in the present experiment, to incorporate alumina particles in Ni3Al during its formation. Alumina particles were dispersed in Ni particles by ball-milling the mixture (mechanical dispersing, MD) and then the Ni particles treated, after compacting with Al powders, were reactively sintered to form Ni3Al with dispersed alumina particles. As another process, NiO particles were dispersed in Ni powder particles by ball-milling (MD), and the resultant Ni powders were mixed with Al powders, compacted and heated. Curiously, the expected reactions hardly occurred (even the formation of Ni3Al), even though the reaction temperature was raised to 1000°C; the reason for this is considered to be due to the blocking effect of yielded alumina formed in thin wall-like barriers retarding the diffusion of Ni and Al to form Ni3Al. The other processes were also tried. For the processes investigated, no apparent effect of gravity, such as segregation of alumina, was observed.抄録全体を表示PDF形式でダウンロード (3805K) -
都築 貴之, 荒川 剛1998 年 45 巻 8 号 p. 754-757
発行日: 1998/08/15
公開日: 2009/12/04
ジャーナル フリーCrystalline powders of platinum group metal (Pd or Pt) and aluminum or zirconium were mechanically alloyed by a laboratory ball mill in an inert atmosphere. The progress of the mechanical alloying was indentified by X-ray diffraction. In the Pd-Al system, the formation of intermetallic compound (PdAl) have been recognized at the begining of milling. In other systems, amorphous alloys were obtained. The crystallization of amorphous alloys was studied by means of X-ray diffraction, differential thermal analysis (DTA) and electrical resisitivity measurement.抄録全体を表示PDF形式でダウンロード (231K) -
金作 整, 雨澤 浩史, 山本 直一1998 年 45 巻 8 号 p. 758-762
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーSingle phase of lithium manganese spinel was synthesized at low temperature by the hydrothermal method. From the result of SEM observation, the particle shape of this specimen was stick type. The chemical formula of this specimen was determined to be Li1.14[Mn0.72Mn4+1.14]O3.93 by ICP analysis and redox titration. The results of differential scanning calorimetry and low-temperature X-ray diffraction showed that the structural phase transition due to the Jahn-Teller distortion was suppressed in this specimen.抄録全体を表示PDF形式でダウンロード (1671K) -
沖本 邦郎, 和泉 克尚, 佐藤 富雄, 豊田 幸夫, 細川 誠一1998 年 45 巻 8 号 p. 763-768
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーFor the purpose of fabricating ferrite part with a complicated shape which has different orientation of the ferrite, joining of pre-formed green compacts was studied, and in particular the feasibility of combined sinter joining method was investigated. As the first step, two simple compacts of disk and ring shape have been individually produced under the non-magnetic field condition. The two compacts was assembled into a unit and then sintered at 1150°C and 1225°C. Effect of addition agent and sintering temperature on the joint strength of the the sintered compacts has been studied. The joint strength of the compacts sintered at 1225°C was about 2 times of that of the compacts sintered at 1150°C. The maximum joint strength was obtained when an inner disk with 0.75mass%CaO and an outer ring with 0.75mass%CuO was joined at sintering temperature of 1225°C.抄録全体を表示PDF形式でダウンロード (3227K) -
中原 賢治, 徳本 啓, 坂口 茂也, 林 安徳1998 年 45 巻 8 号 p. 769-774
発行日: 1998/08/15
公開日: 2010/07/12
ジャーナル フリーThe corrosion behavior of sintered Ti-(0, 10, 20, 30, 40)mass%Mo alloys in (10, 102, 103, 104)mol/m3 NaOH solution was studied by immersion test and electrochemical measurements. The corrosion rate of sintered Ti-Mo alloys in NaOH solution increased with increasing NaOH concentration and Mo content. The corrosion rate of Ti-40mass%Mo alloy in 103mol/m3 NaOH solution, for example, exhibited 5×10-3 mm/year, which was 10 times higher than that of pure Ti. But any corrosion rate of Ti-(10, 20, 30, 40)mass%Mo alloy in 103mol/m3 NaOH solution was less than 1×10-2 mm/year. This fact showed that these alloys had a high corrosion resistance in 103 mol/m3 NaOH solution. Immersion test showed that dissolved Mo content was higher than Mo content in the alloy, in spite of Mo content or NaOH concentration. An intergranular corrosion was observed in SEM microstructure of Ti-(20, 30, 40)mass%Mo alloys after immersion test. Potentiodynamic polarization curves in 103mol/m3 NaOH solution showed that the open circuit potential (corrosion potential) shifted toward more noble potential and corrosion current density increased slightly as the alloy Mo content increased. This might be caused by the unstable spontaneously passivated film formed by the active preferential dissolution of Mo in the alloys.抄録全体を表示PDF形式でダウンロード (2004K) -
黒木 英憲, 周 艶, 篠崎 賢二, 鈴木 裕之1998 年 45 巻 8 号 p. 775-780
発行日: 1998/08/15
公開日: 2009/05/22
ジャーナル フリーIn order to provide a strong bonding between diamonds and matrix, a typical matrix alloy contains copper and cobalt as base metals, and tin, chromium and titanium as additives. Copper has a high thermal conductivity to dissipate heat during grinding together with a low degree of lattice disregistry to diamond to provide bonding strength. Cobalt has rather high values of both modulus of elasticity and elastic limit, and a low coefficient of thermal expansion to be compatible to some extent with the high elastic properties and the low thermal expansion of diamonds during grinding. Those properties make the matrix hold diamond grit tightly. Tin reacts with diamonds to form rough surfaces leading to an increased mechanical bonding strength, while chromium and titanium react with diamonds to make carbide layers on the grits leading to a good bonding strength provided by a good wetting. In the presence of a liquid copper alloy, iron or cobalt forms a solid solution layer containing copper as a main solute on graphite surface. The formation of the layer is driven by a difference of chemical potential in the system. A similar layer formation is possible on diamond surface. The layer will provide tight holding of grits by matrix.抄録全体を表示PDF形式でダウンロード (2370K)
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