巻号一覧
42 巻, 10 号
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島田 一男1995 年 42 巻 10 号 p. 1093-1098
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーThe demand of ferrous sintered machine parts continues to grow favorably mainly for automotive parts, in spite of influence of current domestic economic recession. However, in recent years, it is strongly requested that the performance and quality of ferrous sintered machine parts must be further improved following on surrounding equipments and further economical pursuit. Therefore, this paper describes how our developments go on in production engineering for high strength machine parts and high toughness machine parts, high performance soft magnetic parts and plastic composite sintered parts.抄録全体を表示PDF形式でダウンロード (4025K) -
佐藤 次郎, 林 善夫, 伊藤 孝至, 鰐部 吉基1995 年 42 巻 10 号 p. 1099-1102
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーUsing spherical Ag-Cu gradient powder (AMG), the effects of particle size and distribution on the conductivity of polymer thick film (PTF) are studied. PTF is formed by curing thermosetting conductive paste composed of AMG, resin and solvent. The experimental results are as follows;
(1) The cured film containing many fine particles shows high conductivity.
(2) The cured film containing the narrow range of the particle size shows high conductivity. The packing density of the particles is estimated by computer simulation using randomly packed model. As the result, the packing model formed by the simulation is related well to the conductivity of PTF at the thickness range of 25-30μm.抄録全体を表示PDF形式でダウンロード (2160K) -
佐藤 陽, 中野 幸恵, 野村 武史1995 年 42 巻 10 号 p. 1103-1107
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーThe effect of the mixing procedure of dielectric materials on electrical Properties for multilayer ceramic capacitors(MLCCs) with Ni-electrode has been studied. When mixing is not enough, the fraction defective of insulation resistance is high and the failure mode of accelerated life of insulation resistance show two types (early failure mode and wear-out failure mode). As a result of analysis, segregated phase of small amount of ingredients was detected at the defective spot. These segregated phases resulted from lack in mixing of dielectric materials. It is concluded that highly reliable MLCCs with Ni-electrode are achieved by controlling the mixing procedure of dielectric materials.抄録全体を表示PDF形式でダウンロード (3175K) -
佐藤 直義, 野村 武史1995 年 42 巻 10 号 p. 1108-1113
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーEffct of the granule characteristics of MnZn ferrite on the magnetic properties has been studied.The granules were characterized by strength, deformation modulus, apparent density, and flow rate.The compressibility was evaluated by the porosity during pressing at constant rate of pressure elevation.It is shown that the intergranular pores in the green body resulted in the deterioration of core loss characteristics, and that the pressed density of green body could not be well explained only by the apparent density and the flow rate of granules.Plastic defromation of granules or friction of particles should be taken into consideration.抄録全体を表示PDF形式でダウンロード (2328K) -
耐摩耗性に及ぼす初晶Siの分散状態と粒径の影響石島 善三, 石川 淳一, 佐々木 秀二, 四方 英雄1995 年 42 巻 10 号 p. 1114-1118
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーInfluences of dispersion and sizes of proeutectic Si on wear resistance of P/M Al-Si alloys using the prealloying method and premixing method have been investigated. As a result, discretely dispersed proeutectic Si showed excellent wear resistance in comparsion with uniformly dispersed one. The cause is considered to be the unclosed Si soft phase which has been prefarentially wom away, consequently acting on forming oil grooves and burying worn particles. Further more the existence of the optimum size of proeutectic Si on wear resistance was comfirmed.In the case of finer particles, only Al-Si alloy (pin) was worned away substantially. On the other hand, in the case of larger particles, both the Al-Si alloy (pin) and the mating material (steel disc) were excessively worned away. It is assumed therefore that the finer proeutectic Si particles are not effective as hard particles, on the contrary, larger proeutectic Si particles increase the abrasive wear against the mating material, and those buried into the mating material initiate wear of Al-Si alloy at the same time.抄録全体を表示PDF形式でダウンロード (3991K) -
馬場 剛治, 三浦 秀士, 本田 忠敏, 徳山 幸夫1995 年 42 巻 10 号 p. 1119-1123
発行日: 1995/10/15
公開日: 2009/12/04
ジャーナル フリーMetal injection molding (MIM) process is hoped to be an advanced powder processing technique for the attributes of forming the high density, complex shaped and high performance components. This process also alleviates the need for secondary working operations because of the net shape forming, which is a suitable production route for the hard materials.
In this study, the effects of MIM processing variations on the mechanical properties and microstructures of precipitation-hardenable 17-4 PH stainless steels were investigated. Carbon content, density, structure, and properties of the MIM steels were very dependent on the debinding, sintering, and heat treatment conditions. Especially, the amount of retained austenite in the structure increased with an increase of the residual carbon content, resulting in poor mechanical properties. Accordingly, the carbon control was a very important operation for this steel, which was successfully performed by adjusting the weight loss of debound compacts. Finally, high performance properties comparable to those of wrought steels were obtained by optimizing the heat treatments.抄録全体を表示PDF形式でダウンロード (3054K) -
三浦 秀士, 高巣 正信, 本田 忠敏1995 年 42 巻 10 号 p. 1124-1127
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーHigh performance sintered 4600 steels were obtained by Metal Injection Molding (MIM) process in our previous study. This seemed to be due to the fine heterogeneous structure which were consisted of bainite, martensite and retained austenite by the segregation of Ni added as alloying element. This study has been performed to clarify the relationship between the mechanical properties and the homogeneous and heterogeneous structures of 4600 steels using conventional powder metallurgy (P/M) process.
For the wide sintered density range, the final carbon content was properly controlled by adjusting the additional carbon content and the sintering atmosphere in both prealloyed and elemental mixed powder compacts. Sintered microstructures of the prealloyed powder compacts showed the dual homogeneous structures consisted of ferrite and bainite. On the other hand, the heterogeneous structure including martensite appeared in the elemental mixed powder compacts. In the high density range over 7.3Mg/m3 at which the pores were closed, the strength of the latter was higher than that of the former. However, the strength of the P/M steels were smaller than that of the MIM steels because of the coarse heterogenous structure.抄録全体を表示PDF形式でダウンロード (1745K) -
袖山 研一, 目 義雄, 神野 好孝, 関 博光1995 年 42 巻 10 号 p. 1128-1135
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーFiner hollow microballoon is expected to improve the chemical and physical properties of conventional Shirasuballoon, glassy balloon and expanded perlite. It is shown that fine microballoons of particle sizes under 20μm and bulk specific volume above 2cm3/g are desired by summarizing those of the conventional Shirasuballoons and glassy balloons. Fine Shirasuballoons are prepared from five kinds of vitric volcaniclastic materials named as Shirasu (or Hakudo); Shinjo-Shirasu, Kakuto-Shirasu, Yoshida-Shirasu, Nakano-Hakudo and Biei-Hakudo. The five kinds of vitric volcaniclastic materials are milled and expanded using a fluidized bed furnace. Fine Shirasuballoons within the above regions are successfully prepared except Shinjo-Shirasu by choosing appropriate heating conditions, which are different among the milled powders. Preparation conditions and some properties of fine Shirasuballoons are presented.抄録全体を表示PDF形式でダウンロード (1689K) -
新庄 輝也1995 年 42 巻 10 号 p. 1138
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (62K) -
大谷 義近1995 年 42 巻 10 号 p. 1139-1144
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーTwo dimensional arrays of amorphous R-Co (R = Sm and Gd) alloys or Fe, Ni, alloys with thickness around 200 urn were prepared on top of a 20 nm thick niobium film by means of a-beam lithography and sputter deposition. The arrays consist of 2×2μm2 square particles with spatial periodicity ranging from 4 to 8 μm along the edge of the squre. Demagnetizing processes, magneto optical properties and transport properties were studied. The demagnetization curves appeared strongly different from those of bulk films with no pattern. The obtained curves were compared to those predicted by computor simulation. Calculations show that the evolution of dipolar fields leads to successive reversal of the particles column by column. When these arrays were illuminated by a laser beam, a set of Bragg reflections was observed. The obtained diffraction hysteresis loops were found to yield novel information about the domain structure on a submicron scale. Interesting oscillations due to the fluxoid quantization were observed in the transition lines of underlying Nb films. The superconducting state of the Nb is modulated by stray fields by the square magnetic particles.抄録全体を表示PDF形式でダウンロード (2878K) -
山口 正洋, 荒井 賢一1995 年 42 巻 10 号 p. 1145-1150
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーThis article describes the recent remarks in the technology field of micromagnetic devices and micromagnetic actuators. The technology bases of these devices include material development, process technology, device design technology and high-density packaging technology. The fabrication techniques are most important for realizing these devices. LIGA process andanodic oxidation process for thick metallic structure are explained.抄録全体を表示PDF形式でダウンロード (374K) -
入江 庸介, 榊間 博, 里見 三男, 川分 康博1995 年 42 巻 10 号 p. 1151-1155
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーGiant magnetoresistance (GMR) in Co/Cu metallic multilayers was measured with a current perpendicular to the plane (CPP) at room temperature. Micro-pillar structures with a height of 1.0 a m and widths ranging from 15 to 25 u m, fabricated by using optical lithogrphy and Ar ion etching techniques, were used for the measurement. The CPP MR in Co (3 nm)/Cu (2 nm) multilayers was found to be 2.5 times larger than the MR with a current in the film plane (CIP).抄録全体を表示PDF形式でダウンロード (1555K) -
前田 篤志, 久米 実, 黒木 和彦1995 年 42 巻 10 号 p. 1156-1161
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーVarious magnetic wire and box arrays were prepared by high-resolution electron-beam lithography and lift-off techniques. Both the coercive force and demagnetizing field for the Ni80Fe20 arrays with a constant wire width decreased with the inter-wire distance. When a static field was applied normal to the NiA80Fe20 stripes and parallel to the array plane, multiple microwave absorption was observed at fields higher than the uniform precessional mode. These results indicate the presence of long-range magnetic interaction. Magnetoresistance (MR) characteristics of the wire arrays comprising three types of giant MR multilayers are also reported here.抄録全体を表示PDF形式でダウンロード (1525K) -
小野 輝男, 新庄 輝也1995 年 42 巻 10 号 p. 1162-1167
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーA new class of multilayers is fabricated on microstructured substrates. The Giant Magnetoresistance effect in a new geometry, CAP, (with current at an angle to the layer plane) was studied by using multilayers prepared on V-shaped groove structures with micron-scale. CAP-MR is larger than MR with current in the plane (CIP-MR). Moreover, MR value with current perpendicular to the plane (CPP-MR) is estimated by using observed CIP-MR and CAP-MR values. MR dependence in these geometries on temperature and spacer layer thickness was studied.抄録全体を表示PDF形式でダウンロード (3696K) -
山本 良治, 五十嵐 廉1995 年 42 巻 10 号 p. 1171-1177
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーHexagonal ammonium tungsten bronze (ATB, (NH4)xWO3) and tungsten trioxide obtained by the thermal decomposition from monoclinic ammonium paratungstate (APT) and tungstic acid were reduced in dry hydrogen. Monoclinic WO2.90, tetragonal WO2.90, monoclinic WO2, and cubic β-W (i.e. W3O) for intermediate were produced. The decomposition of β-W was investigated by DTA in argon atmosphere. The reduction process are as follows.
WO3(1)monoclinic WO2.90(2)monoclinic WO2(3)cubic W (α-W)
(4)(NH4)xWO3(5)tetragonal WO2.90(6)(7)cubic W3O (β-W) (8)
Reduction path of the WO3 that accompanied by heat evolution while thermal decomposition of APT is (1)(2)(3). Reduction of ATB of endothermic compound proceeds as (5)(6) and β-W form. The WO3 from tungstic acid of endothermic compound is reduced path as (4)(5) and β-W also form. The β-W decompose to WO2 and α-W accompanied with heat evolution with elevation of reduction temperature. It is conceivable that endothermic energy during thermal decomposition go down activation energy to produce tungsten metal.抄録全体を表示PDF形式でダウンロード (1641K) -
草加 勝司, 河野 富夫, 山本 知己1995 年 42 巻 10 号 p. 1178-1183
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーA comparative study was made on press/sintering behavior of water-atomized 17-4PH stainless steel alloyed and partially mixed powders and properties of the sintered materials.
The results were summarized as follows:
(1) Mixedα/γ-phase powder has higher compressibility than alloyed one by-8% in the state of rapid-quench atomization, as expected from Schaeffler constitution diagram.
(2) Mixed powder compact is characterized by better green strength (Rattler value) and also by less dimentional change during sintering operation for practical use.
(3) Powder compacts sintered at higher temperature have much the same tensile strength (1000MPa-graded) and corrosion resistance in the both cases of alloyed and mixed powders.抄録全体を表示PDF形式でダウンロード (7861K) -
岡田 亮二, 羽田 光明, 日置 進, 荒谷 雄, 松縄 朗, 片山 聖二1995 年 42 巻 10 号 p. 1184-1189
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーUltra-fine particles (UFP's ), which have different characteristics in material properties from bulk matter and are useful as a functional material, were produced by pulsated YAG laser. In this process, the plume phenomena by irradiation of laser to titanium were observed by high speed video recorder and the growth rate of the plume were measured. And the production rate of UFP's and the effect of atmosphere were investigated.
As the result, summarized conclusions are followed;
1) The growth rate of the plume was about 26.4 m/s in air.
2) The maximum production rate of titanium UFP's in air was about 6.6 g/hour. It was limited by the maximum ability of 80 J/pulse of laser generator used.
3) UFP's of titanium-nitride of about 20 nm in diameter were produced in the 13.3 kPa (100 Torr) nitrogen atmosphere.抄録全体を表示PDF形式でダウンロード (3377K) -
上平 一茂, 本多 均一, 藤井 忠行1995 年 42 巻 10 号 p. 1190-1195
発行日: 1995/10/15
公開日: 2009/12/04
ジャーナル フリーIn order to clarify the fundamental factors for preparing technologically a largescale molybdenum single crystal by. means of secondary recrystallization, the effect of rolling reduction on the secondary grain growth in molybdenum sheet doped with CaO and NgO was investigated texturally and optically.
For the case where the rolling reduction was more than 60%, a uniformed and finegrained recrystallized structure was obtained after an anneal at 1500 or 1800°C, while the secondary grain growth occurred after an anneal at 2000°C and a single crystal was obtained. In contrast, for the case where the rolling reduction was less than 50%, only coarse-grained recrystallized structure was obtained after an anneal at 1500 or 1800°C. Even after an anneal at 2000°C the secondary grain growth did not occur. Consequently, a single crystal was not obtained even for a rolled sheet doped with a certain amount of CaO and/or KgO.
These behaviors can be explained in relation to the shape and size of grains obtained for primary recrystallized sheet as a result of rolling reduction.抄録全体を表示PDF形式でダウンロード (1992K) -
橋本 等, 鷲見 新一, 阿部 利彦, 鎌田 公一, 吉田 敏裕1995 年 42 巻 10 号 p. 1196-1201
発行日: 1995/10/15
公開日: 2009/05/22
ジャーナル フリーWe observed the formation process of Ti-Al intermetallic compound powder during mechanical alloying of a powder mixture of Ti and Al by using a tumbling ball mill and found that the formation of the intermetallic compound powder was promoted by nitrogen gas in a milling atmosphere. Based on this finding, we introduced a small quantity of nitrogen gas into the milling atmosphere in order to shorten the time required for producing the intermetallic compound powder and to improve its yield. As a result, we found that an intervenient introduction of 1vol.% nitrogen gas into the milling atmosphere can achieve a yield of 98.8% after milling for 1440ks.抄録全体を表示PDF形式でダウンロード (1879K) -
朝日 信夫, 松本 伸史, 伊藤 智也, 土屋 育子, 佐藤 正典, 川原 亮1995 年 42 巻 10 号 p. 1202-1206
発行日: 1995/10/15
公開日: 2009/12/04
ジャーナル フリーPure crystalline powders of Al, Pd and Mn have been mechanically alloyed using a conventionally planetary ball mill (Fritsch "Pulverisette 7") with the intensity at 7 in an Ar atmosphere and A70Pd30-xMnx (X=5, 10, 15 and 20) alloy powders have been synthesized. The alloying process was examined by X-ray diffractometry. An icosahedral phase quasicrystal with face-centred six=dimensional hypercubic lattice is obtained directly during milling for Al70Pd30-xMnx powders with compositions X=5 and 10. The results are compared with data for liquid-solidified alloys. For Al70Pd30-xMnx powders with compositions X=15 and 20, the formation of quasicrystalline phase is not observed.抄録全体を表示PDF形式でダウンロード (259K)
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