巻号一覧
48 巻, 11 号
選択された号の論文の18件中1～18を表示しています
- |<
- <
- 1
- >
- >|
-
Shigetoshi Muranaka, Toshihiko Shigematu2001 年 48 巻 11 号 p. 995-999
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーZn2In2O5 films were reactively deposited with assistance of rf discharge in the oxygen pressures of 3×10-2 and 7×10-2Pa and at substrate temperatures between room temperature and 530°C. The influence of the substrate temperature and the oxygen pressure on the film structure and the physical properties was studied. Crystallized films could be deposited at 3×10-2 Pa and at below 450°C, while at the higher oxygen pressure of 7×10-2 Pa, partially crystallized or amorphous films were deposited depending on the substrate temperature. The crystallized films deposited at 320 and 420°C exhibited high electrical conductance with the resistivity of about 8×10-3 Qcm and the excellent light transmittance of averagely 85% in the visible light range. At the lower substrate temperature and/or at the higher oxygen pressure, the resistivity of the films was markedly increased without deteriorating the high optical transmission.抄録全体を表示PDF形式でダウンロード (2939K) -
大橋 修, 山口 典男, 萱沼 安昭2001 年 48 巻 11 号 p. 1000-1005
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーBonding of 4032 aluminum to aluminum bronze was tried using a pulse electric current method. The initial current, which was adopted at heating until bonding temperature, had much effect on tensile strength of joints. At high heating rate 250°C/min with high initial current, the tensile strength of some joints attAlned about 80% of base metal. But at slow heating rate 25°C/min, strength of the joints is low.
The process temperature was controlled at carbon dies. At high heating rate, temperature at bonding interface was higher than one of carbon dies. Then local melting along bonding interface occurred and formed the metallic compound. At low heating rate, the reaction layer was formed at bonding interface by solid reaction. In order to heat bonding interface locally, it is effective to adopt the high heating rate and the application of intermediate material powder at bonding interface.抄録全体を表示PDF形式でダウンロード (4970K) -
大橋 修, 山口 典男, 梅田 節, 佐藤 一男2001 年 48 巻 11 号 p. 1006-1010
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーThe surface layer of sintered compacts using the pulse electric current sintering method is heated at higher temperature than the inside of the compacts. As the result, the density of the surface layer is higher than that of inside part, there is a possibility of canning-less HIP treatment.
To promote the sintering at surface layer, the sintered compacts were prepared at various initial currents using the pulse electric current sintering method. But the porosity difference in the position of the various sintered compacts made with copper powder is little. It is difficult to make the closed pores at the surface layer of the sintered compacts. The copper sintered compacts treated by canning-less HIP treatment at 100 MPa and 0.1 MPa did not show the difference in tensile strength, density and morphology at fracture surface. There was no possibility of canning-less HIP treatment techniques of the sintered compacts using the pulse electric current sintering method.抄録全体を表示PDF形式でダウンロード (3622K) -
大橋 照男, 赤松 栄作, 森川 勝利2001 年 48 巻 11 号 p. 1011-1019
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーSintering of mechanically alloyed copper-tin-graphite powder mixtures was performed in a hydrogen gas stream to provide the wear resistance alloys. An optimum sintering condition which gave about 93% of the calculated density could be satisfied in the temperature range of 773 to 973 K; however, the facility of sintering of these powders was influenced by MA conditions (selection of milling time of metals and graphite powders). A milling time that gave a graphite-coated structure to the milled metal particles led to the difficulty in sintering. The morphology, size and distribution of graphite particles in the sintered matrix could be controlled by a proper selection of MA conditions. Dynamic friction coefficient of the sintered alloys in a dry argon gas was in the range of 0.15 to 0.2, corresponding with the inherent value of the graphite as the solid lubricants.抄録全体を表示PDF形式でダウンロード (4548K) -
岩津 修2001 年 48 巻 11 号 p. 1022
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (93K) -
小倉 邦明2001 年 48 巻 11 号 p. 1023-1028
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーImprovement of the functions of iron powder premixes for easy use and high performance was studied from the viewpoints of both the lubricant used and the iron powder itself. From the viewpoint of lubricants, the characteristics realized included (1) improved flowability of wax lubricant type premixes by controlling the adhesive force between powder particles and (2) improved compressibility of premixes for warm compaction by promoting powder rearrangement during compacting. Characteristics realized by improvement of the iron powder itself included (3) stabilized dimensional change during sintering of Fe-Cu-C system sintered materials by controlling the Si content of the iron powder, (4) high tensile strength of 1000MPa without heat treatment by forming a fine pearlite microstructure using 1Cr-0.3Mo-0.3V (mass%) completely alloyed steel powder, and (5) improved machinability with a 40% decrease in tool wear without heat treatment using 2Ni-1Mo partially alloyed steel powder, while securing the same strength as conventional 4Ni-1.5Cu-0.5Mo partially alloyed steel powder after heat treatment.抄録全体を表示PDF形式でダウンロード (477K) -
寺下 敬次郎, 藤田 航, 佐藤 宗武, 久米 秀樹, 宮本 大樹2001 年 48 巻 11 号 p. 1029-1036
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーIn the present study, the novel granulation method, spray fluidized bed granulation method was used to produce the granules. Subsequently compacts of the granules were produced through a series of process of dry compaction and sintering under atmospheric pressure. The effects of the properties of granules on compacts and sintered compacts were investigated.
First, the granules with target size and good flowability could be produced by using the granulator. The granules were found to have spherical shapes and smooth surfaces. Second, compaction of the granules with sharp size distribution and good flowability showed low fluctuation in flexural strength. Third, granules with low strength were useful for the production of sintered compacts with highly density and flexural strength.
In addition to granulation, the granulator has ability to perform the coating of the granules. For pharmaceutical materials, coating of granules and subsequent compaction was performed. The results showed coating operation enhanced the strength of compacts. For ceramic materials, similar achievement is expected.抄録全体を表示PDF形式でダウンロード (4592K) -
石橋 新一郎, 佐藤 寿彦, 山下 廣治, 高瀬 昭三, 石橋 定己, 嶋貫 孝2001 年 48 巻 11 号 p. 1037-1043
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーResidues such as wood chips or coffee dregs have been disposed of industrial waste.
However owing to revision of the relevant laws, it has become necessary that more than 20% of the waste is recycled. In this study, wood chips and coffee dregs were baked in a self-burning rotary kiln to produce porous carbonized materials. We examind five types of specimens, i.e., wood chips baked with and without clay minerals, coffee dregs baked with and without clay minerals and conventional carbon made of coconut palm. Deodorization effect concerning gas emitted from garbage, river water, industrial wastes and decolorization concerning river water were evaluated. The carbonized materials made of wood chips or coffee dregs baked without clay minerals indicated good performance.抄録全体を表示PDF形式でダウンロード (2921K) -
Di Li, Hajime Haneda, Kinuyo Kawano, Noriko Saito2001 年 48 巻 11 号 p. 1044-1050
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーZnO powders with different morphologies were synthesized by alkali precipitation method, organometallic zinc hydrolysis, and spray pyrolysis. Acetaldehyde decomposition was used as a probe reaction to evaluate the photocatalysis of these ZnO powders. The relationship between photocatalytic activity and crystallinity, surface area, or morphology was investigated. The results indicate that the photocatalytic activity depends on crystallinity, rather than surface area, for the same kind of ZnO particles. However, no direct relationship between photocatalytic activity and crystallinity or surface area was found for the different kinds of ZnO particles. Instead, we find that the particle morphology significantly affects its photocatalysis.抄録全体を表示PDF形式でダウンロード (2299K) -
泉 平臣, 飯泉 清賢, 久高 克也2001 年 48 巻 11 号 p. 1051-1055
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーTiO2-Ca(1:2) mixture was milled in a planetary ball mill using cemented tungsten carbide vial and balls. It is supposed that in the mechanochemical reduction reaction of titanium oxide, TiO2+2Ca→ Ti+2CaO (ΔH=-326kJ/mol), a part of the reaction system is firstly ignited at about 830°C by mechanical energy and then the explosion reaction propagates to the whole of the reaction system by the reaction heat. This reaction process, in the range of weight of balls, 500-820g, as sample weight increases, time required for the reactions becomes longer, but the reduction reaction is accelerated and the side reactions are suppressed. In these experiments, the most suitable weight of the sample was about 110g for the reaction vessel of 250ml.抄録全体を表示PDF形式でダウンロード (1876K) -
小比賀 基治, 濱荻 健司, 福田 匡, 阿佐部 和孝2001 年 48 巻 11 号 p. 1056-1060
発行日: 2001/11/15
公開日: 2009/12/04
ジャーナル フリーThe relationship between atomized median particle size and atomizing conditions was discussed. Median particle size was proportional to one-seconds power of gas and metal flow rate ratio. An experimental equation was obtained as follows;
dp/Dl=63.6⋅((M1/Mg)⋅(σ1/(D1⋅ρ1⋅Vm2))⋅(ν1/νg))0.5
where dp is the mean particle size, Dl is diameter of melt delivefy tube, M1 is mass flow rate of melt, Mg is mass flow rate of gas, Vm is average gas velocity in near nozzle region, σ1 is the surface tension of melt, ρ1 is the density of melt, ν1 is kinetic viscosity of melt, νg is kinetic viscosity of gas and k1 is a constant.
Effect of gas velocity distributions in near nozzle region on particle size distributions was discussed. Gas velocity distributions were calculated by solving the full Reynolds-averaged Navier-Stokes equations. The calculated gas velocity distributions roughly coincided with the experimental results. Particle size distributions were calculated by using gas velocity distributions and our experimental equation for mean particle size. The calculated particle size distributions also coincided roughly with the experimental results. It was shown that the particle size distribution depends on the gas velocity distributions in near nozzle region.抄録全体を表示PDF形式でダウンロード (436K) -
島 進2001 年 48 巻 11 号 p. 1062
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (108K) -
沖本 邦郎2001 年 48 巻 11 号 p. 1063-1070
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーThis paper reviews the researches in powder forming which were carried out by the author. In the compaction and forming of metal powders, first a compaction criterion in a stress state such that σ2=σ3 was obtained; this gives a relation between principal stresses and density of the green compact. Next, by using the results obtained from the cold forgeability of sintered iron, a ductile fracture criterion for porous metals was proposed. The formation process of joint strength
in the infiltration joining was made clear. Furthermore, rapidly solidifying superplastic powder was prepared by centrifugal atomization method.
In the forming processing of magnetic powders, meantime, a new type of composite magnetic material was fabricated by combination with electro-magnetic properties of ferrite powder and the superplastic properties of Zn-22Al alloyed powder. To improve the magnetic characteristics of the permanent magnets, orientation forming of magnetic powders mixed with a MIM binder was attempted and a new orientation forming process was proposed. Moreover, for the purpose of producing ferrite part with a complicate shape which has different alignment of the ferrite crystallites, the feasibility of combined sinter joining method was carried out. As another application of combined sinter joining, a stainless steel-permalloy composite was fabricated and the forming conditions to give sufficiently high joint strength to it were found.抄録全体を表示PDF形式でダウンロード (4093K) -
松井 則男, 小林 慶三, 尾崎 公洋, 松本 章宏2001 年 48 巻 11 号 p. 1071-1075
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーFe-48at%Cr alloy powder was synthesized by mechanical alloying (MA) of a powder mix of Fe and Cr using a planetary ball mill for 324 ks under 1.33-kPa argon atmosphere. The MA powder was mixed with 50, 60, 70, 80 and 90 mass% MJSi2 by the same planetary ball for 36 ks. The obtained mixtures were sintered at 1273K for 0.3 ks through pulsed current sintering (PCS) process.
Temperature of the start of shrinkage decreased with increasing amount of MA powder in the mixture. The shrinkage of MoSi2-50mass% (Fe-48at%Cr) powder started at a temperature about 200 K lower than that of MoSi2 powder. But, We found that reacted layer was formed at the interface between MoSi2 and Fe-48at%Cr, for the compositions of rich Fe-48at%Cr.
MoSi2-30mass%(Fe-48at%Cr) composite showed higher oxidation resistance than MoSi2 in the air at 1273 K. X-ray diffraction analysis showed Cr3O2 coat was formed on the surface of MoSi2-30mass%(Fe-48at%Cr) composite.抄録全体を表示PDF形式でダウンロード (3437K) -
長柄 毅一, 冨田 正吾, 岡田 亮, 稲田 尚行, 横田 勝2001 年 48 巻 11 号 p. 1076-1081
発行日: 2001/11/15
公開日: 2010/07/12
ジャーナル フリーPulsed Current Pressure Sintering (PCPS) was applied for sintering of the automotive component “rackguide” which is a part of a steering device. Al, Cu, Si and Al-Mg powder were used as starting materials. These powders were mixed at A2014 alloy composition. Microstructure observation by OM and SEM, vickers hardness measurement, tensile test and dimensional measurement of the sintered compacts were carried out. Results obtained were as follows. (1) Cu and Si powder particles were dissolved into Al matrix during sintering and heat treatment. (2) Maximum tensile strength and elongation of sintered compacts before heat treatment were 300 MPa and 17%, respectively. After heat treatment (T6), these values were changed to 400MPa and 8%, respectively. (3) Dimensions of the sintered compacts satisfied IT10 grade of dimensional tolerance in JIS B 0401-1. After pressed for sizing, the dimensions fulfilled the IT 7 grade.抄録全体を表示PDF形式でダウンロード (4092K) -
浅見 淳一, 廣瀬 徳豊, 沢 淳一, 梅田 彰2001 年 48 巻 11 号 p. 1082-1088
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーA trend in sintered machine parts is the production of net shaped objects and comprex shaped parts. Correspondingly the machinability of green compacts with a lathe was investigated experimentally. In this regard, the compactibility of a raw powder was also discussed. Beside Fe-40% Cu plated powder with excellent compactibility, Fe-40%Cu, Fe-3%Cu, Fe-3%Cu-1%C and Fe-1%C as mixed powders and Fe powder were used. All these green strengths increase in proportion to the compacting pressure in the range of 98MPa to 686MPa. As the results of cutting test, satisfactory cutting surfaces were obtained for the green compacts with the radial crushing strength above about 60 MPa. Furthermore, the graphite as one of the alloying elements serves to provide lubrication on cutting. Conseqently, both Fe-3%Cu-1%C and Fe-1%C compacts exhibit good machinability in spite of low green strength in comparison with the others.抄録全体を表示PDF形式でダウンロード (6796K) -
Yuanbin Xu, Hiroyuki Nomura2001 年 48 巻 11 号 p. 1089-1096
発行日: 2001/11/15
公開日: 2009/12/04
ジャーナル フリーThe model suggested by Ashby and Coble was used to analyze the sintering process of pure titanium in this paper. Then based upon this result, homogenizing behavior of alloying elements of aluminum and iron during sintering was further discussed for bio-titanium alloy Ti-5A1-2.5Fe. Using this method, the concentration variation of alloying elements was calculated to indicate the effect of element diffusion on the structure transformation. It was shown that the calculated results were in agreement with the results obtained in the previous experiments.抄録全体を表示PDF形式でダウンロード (2136K) -
三浦 秀士, 矢野 健文, 松田 光弘2001 年 48 巻 11 号 p. 1097-1101
発行日: 2001/11/15
公開日: 2009/05/22
ジャーナル フリーMIM process is hoped to be an advanced powder processing technique for near net shape forming the high density, high performance, and complicated parts. However, there still remains the issue of limitation in the shape and volume of MIM compacts because of using the die.
In this study, as one of new approaches to improve the above problems in MIM process, MIM in-process joining of thin and hollow parts by using the exuded wax during solvent debinding step has been attempted to produce larger, more complicated and functional parts by combination of the same or different materials such as martensitic (SUS420J1) and austenitic (SUS304L) stainless steels.抄録全体を表示PDF形式でダウンロード (4790K)
- |<
- <
- 1
- >
- >|