巻号一覧
41 巻, 3 号
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西川 友三1994 年 41 巻 3 号 p. 208
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (78K) -
河合 伸泰1994 年 41 巻 3 号 p. 209-214
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーHot isostatic pressing technology has been applied to produce new materials with high performance using gas atomized alloy powders as raw materials. The author has been studying the technology in order to extend the application field for a long time. High speed tool steels and alloy tool steels, bimetallic products lined with corrosion and wear resistant alloy powders, heat resistant superalloy disks etc. are described.
Mechanical and physical properties of PM high speed steels with and without a large amount of nitrogen were evaluated in comparison with conventional steels so that the difference in the roles of nitrogen and carbon in the steels and in the manufacturing processes could be made clear. The manufacturing process of bimetallic cylinders and valves and the alloy design of lining, especially the effects of alloying elements. in Co and Ni base alloys are discussed. As-HIP and HIP plus isothermal forging of superalloy disks were studied and isothermal forging of dual property disk made of different powders was also described.抄録全体を表示PDF形式でダウンロード (2710K) -
Takashi Itoh, Yoshimoto Wanibe1994 年 41 巻 3 号 p. 215-226
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーQuantitative characterization and analyses in powders and powder processing are necessary fundamentals for quality control and assessment of the products and the processes. The present report has been focused onto powder characteristics and random packing as the successive processing. Powders can be quantitatively characterized by diagramming both the measured sizes and shapes of the particles. A stereometric model has been proposed for the general powder particle in consideration of the shape. The random packing of spheres has been simulated for the given size distributions. The structures of the packed beds and the densities have been summarized. The quantitative relation between the powder characteristics and the packing density has been discussed.抄録全体を表示PDF形式でダウンロード (695K) -
小野 勝史, 金子 泰成, 寒川 喜光1994 年 41 巻 3 号 p. 227-231
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーIn this paper, the effects of oxidation on thermal debinding process for properties of sintered parts made by MIM (Metal Injection molding) were studied using 4 kinds of copper powders(Gas atomized powder, water atomized powders and flakelike powder). The difference of sintered peoperties with sintering atmosphere(H2, vacuum) was investigated. The scale of oxidation of powders in air related to the binder removal, impurity oxygen content and specific surface area of powders. Copper oxides(Cu2O, CuO) formed on surface of particles during debinding process were reduced in H2 at 500°C, but which presented inside particles was remained and influenced densification of parts. The density of sintered parts at 980°C in Ha and vacuum was influenced by the scale of oxidation of powders. Sintered density tended to be low with increasing the scale of oxidation of powder, independently of sintering atmosphere. Residual oxygen content decreased with increasing sintered density and decreasing the scale of oxidation of powders. These tendencies were remarkably appeared with flakelike powder, but hardly with the other powders. In comparision with sintering properties in Ha and vacuum, sintered density and residual oxygen content of sintered parts had little difference.抄録全体を表示PDF形式でダウンロード (3022K) -
寒川 喜光, 秋房 義則, 小野 勝史, 金子 泰成1994 年 41 巻 3 号 p. 232-235
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーIn this paper, solvent debinding of injection molded metal powder by organic solvents of high flashing point was studied. The binder was composed of polyplopylene, paraffin wax and urethane wax. The urethane wax was suitable for rapid solvent debinding by high flashing point organic soIvent. DecaIin(f.p.54.9°C) and Tetralin (f.p.80.2°C) were used as high flashing point organic solvent. The solvent debinding with Decalin and Tetralin was compared with Xylene(f.p.25.6-29.4°C) and Dichloromethane (b.p.40.0°C). flecalin and Tetralin at 50°C exhibited as high extraction ability as Xylene at 20°C. Furthermore, the solvent mixtures(Dichloromethane:Decalin=5:5, 4:6, 3:7) at 50°C exhibited higer extraction ability, and it was comparable with the extraction ratio of Xylene at 50°C to be higher temperature than the flushing point. However, as the organic solvents of high flashing point have the slow volatilization property, it was necessary to dry in vacuum or in blower after solvent extraction. In spite of the fact, it was proved that the organic solvents of high flashing point can be effectively used as substitute for the conventional solvents.抄録全体を表示PDF形式でダウンロード (1364K) -
地主 弘幸, 京極 秀樹, 岡本 作治, 篠原 和充1994 年 41 巻 3 号 p. 236-239
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーThe effect of debinding temperatures on mechanical properties of sintered Fe-4%Ni alloy compacts made by injection molding has been studied. Specimens were made of carboyl iron and carbonyl nickel powder having average diameters of 5 and 2 μm respectively. After specimens were debound in temperature range from 503K to 553K with a holding period of 7.2ks in the air, they were sintered at a constant temperature of 1523K with a holding period of 7.2ks in the reduced pressure of 1Pa. In the case of debinding in the air, there is the critical debinding temperature at which oxide particles begin to form. Above the critical debinding temperature, oxide particles precipitate along grain boundaries and within grains. As the debinding temperature becomes higher, they grow mainly along grain boundaries. The mechanical properties of sintered compacts change drastically above the critical debinding temperature. The tensile strength of the compacts debound above the critical temperature, for instance, takes maximum value and its elongation is drastically lowered.抄録全体を表示PDF形式でダウンロード (2521K) -
三浦 秀士, 馬場 剛治, 安藤 新二, 本田 忠敏1994 年 41 巻 3 号 p. 240-243
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーIn the metal injection molding process, fluidity of the compound with metal powder and binder is very important factor for molding without defects. In this paper, the effects of molding condisions (injection temperature and rate) on the moldability and the mechanical properties of compacts have been investigated by means of flow test and tensile test. The compound consisted of a carbonyl iron powder and a multi-component wax-polymer binder. Two different types of the binder were used for this study, one was APP-binder (consisted of 20% Atactic polypropylene) and the other was IPP-binder (20% Isotactic polypropylene). The results were summarized as follows:
1) The compound with APP-binder gave the good moldability, because its fluidity showed gradual change in the relation between temperature and viscosity.
2) When the low injection rate was adopted at low barrel temperature which the compound showed high viscosity, flowmark type of the defect appeared on the surface of green compacts. On the other hand, when the high injection rate was adopted at high barrel temperature which the compound showed low viscosity, segregation of the binder was observed in the green compacts. Such molding conditions were detrimental to the mechanical properties of sintered compacts.
3) The combination process with thermal and solvent debinding produced a shortening the binder removal time and preventing the distortion.抄録全体を表示PDF形式でダウンロード (2776K) -
武川 淳二郎1994 年 41 巻 3 号 p. 244-247
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーThe injection molding process (MIM)for the Ti-15Mo-3Al alloys has been studied by using the mixed powder consisting of Ti.Mo and TiAl. The average size of these powders was 38 μm. 1.24μm and 9.4μm, respectively. The results obtained were as follows.
1) The kneading, molding and debinding (in the first stage)processes were successfully performed even in the air.
2) The compacts debound at 210°C in the air, followed by debinding at 500-550°C in a vacuum, were densified to a relative density of 97% or more after sintering for 3 hours at 1296°C in a high vacuum.
3) Many precipitated TiC partic]es were observed in these sintered compacts. which were not observed for the compacts obtained by conventional P/M process.抄録全体を表示PDF形式でダウンロード (2462K) -
廣瀬 徳豊, 浅見 淳一1994 年 41 巻 3 号 p. 248-252
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーWe developed a novel observation technique for density distribution of fine powder compact with an acoustic microscope. Carbonyl nickel powder was compacted under pressure of 98-392MPa as standard specimens to measure green density (GD) and dimensional change in parallel and perpendicular to the pressing direction (DC ?? and DC⊥, respectively) and of 98-294MPa as specimens to observe surface acoustic image. Subsequently, all the specimens were sintered at 1073K for 3.6ks in hydrogen atmosphere. Calibration curves of GD and DC⊥ vs. echo intensity were calculated from relationship between GD, DC ?? and DC⊥ of standard specimens. Then, the calibration curves were used to convert acoustic images into GD distribution maps, DC ?? maps and DC⊥ maps. As the results of comparisons of deformation of sintered compacts and prediction in the DC⊥ maps, obvious correlations between them were seen. As the DC⊥ map is different expression of the GD distribution map, therefore, it is capable to use the GD distribution map that effect of the GD distribution on dimensional change, i.e. deformation of sintered fine powder compact is discussed before sintering.抄録全体を表示PDF形式でダウンロード (3071K) -
岩崎 和春, 細谷 健, 下向 仁, 松田 隆明1994 年 41 巻 3 号 p. 253-258
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーBonded soft ferrite using the injection molding has been expected for many applications because it is in conformity with the miniaturization and complicated shape in the electronic devices. However, the electronic devices recently need the bonded soft ferrite having high thermal resistance and bending strength. We examined the difference of characteristics between the polyamide resin/ferrite compound and the polyphenylene sulfide resin/ferrite compound, and also made clear the relation between fludity, permeability μ', bending strength and additional quantity of binder resin in the PPS resin/ferrite compound mixed with three kinds of NiCuZn ferrite powders whose size distribution was different. As the result, the molded chokecoil device having superior electric properties was obtained using the optimum injection molding of NiCuZn ferrite compound.抄録全体を表示PDF形式でダウンロード (3666K) -
バインダーおよび造孔剤の添加量と密度との関係星野 孝二, 河野 通1994 年 41 巻 3 号 p. 259-262
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーEffect of the amount of binder and the pore. forming filler on the green density and the sinterd density in the tape casting method were investigated using a Ni-Cu-Al alloy powder made by the high pressure water atmization method. The green sheets were sintered by the sintering method involving oxidation and reduction. The results showed as follows;
In the case of using methyl cellulose as the binder;
1) The green density was not altered by the amount of binder when dried at room temperature.
2) The green density decreased as the dry temperature rised.
3) When using the carboxy methyl cellulose as the pore forming filler, the green density was almost the same as the tap density in water of the mixture of the metal powder and the pore forming filler.
4) The sintered density was almost the same as the green density.
In the case of using P V B as the binder;
5) The green density decreased as the amount of binder increased, but regardless of the amount of binder, the density of the sintered sheet became almost the same as the tap density of the raw metal powder.抄録全体を表示PDF形式でダウンロード (272K) -
日比野 敦, 佐藤 一太郎, 根岸 秀明1994 年 41 巻 3 号 p. 263-268
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーElectromagnetic forming has been used for plastic deformation technology of metal materials. In this paper, shock compaction of iron powder compacts by electromagnetic forming was attempted to investigate a possibility of the electromagnetic pressure sintering. An iron compact was put into a solenoid coil and a strong pulse current was passed through the coil, then the compact was compressed by electromagnetic pressure. But, the compact was broken to pieces by the strong electromagnetic filed. The destruction was caused by poor electric conductivity and low toughness of the compact. Accordingly, the compact was pre-sintered in a vacuum furnace to improve its electric conductivity and toughness. The electromagnetic forming of the pre-sintered compact increased the relative density. Therefore the processing may be applicable to powder pressure sintering.抄録全体を表示PDF形式でダウンロード (3490K) -
師岡 利政, 湯浅 栄二, 守川 洋1994 年 41 巻 3 号 p. 269-272
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーMixture of aluminum and amorphous Ti-43at%Cu powders was mechanically alloyed to produce aluminum powder with a dispersion of amorphous particles. Microstructural changes in the both particles during the mechanical alloying and influence of heating on the structure of alloyed powder were investigated by using X-ray diffraction and differential thermal analysis. In the powder mechanically alloyed for prolong milling period than 14.4ks, intermetallic Al2Cu phase is formed by the heating at 600K and the Al3Ti and Al2Cu3 phases are formed at 800K. The forming temperature of Al3Ti and Al2Cu3 phases decreases with the increasing of milling period. Crystallization of AITi from t1he amorphous phase begins at about 700K. Extrusion of the mechanically alloyed powder was carried out at 573K, the amorphous structure of Ti-43at%Cu particle was unchanged during the heating at that temperature. The hardness of the extruded alloy increases with increasing of the mechanical alloying period and the heating temperature.抄録全体を表示PDF形式でダウンロード (228K) -
師岡 利政, 湯浅 栄二, 守川 洋1994 年 41 巻 3 号 p. 273-276
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーMixture of aluminum, copper and titanium powders was mechanically alloyed and then the powder was heat-treated at various temperature. A change of structure of the powder with milling period was investigated by using XRD, DTA, SEM and EPMA. In the early stage of mechanical alloying, particles of Cu and Ti are deformed and dispersed in Al matrix, but degree of deformation of Ti particle is smaller than that of Cu particle.
Particles of Cu and Ti become finer with the increasing of milling period, and they disperse homogeneously as the milling period reaches to 72.0ks. Intermetallic Al2Cu phase was observed in the powder mechanically alloyed for 21.6ks. In the powder heattreated at 773K intermetallic Al3Ti and AlCu phases were observed. The forming temperature of Al3Ti and AlCu phase decrease with the increasing of milling period.
Intermetallic AlTi phase was observed at low temperature in the powder mechanically alloyed for 72.0ks.抄録全体を表示PDF形式でダウンロード (1477K) -
湯浅 栄二, 師岡 利政, 角田 誠1994 年 41 巻 3 号 p. 277-280
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーSintering of Cu-8mass%Ti-4mass%B alloy powder prepared by mechanical alloying was carried out at temperature range of 673K to 1173K for various times. Changes of structure and mechanical strength of the sintered powder-compact with the sintering process were investigated by using of X-ray diffraction analysis, electron microscope, Vickers hardness test and 3-points-bending test. Hardness of the compact sintered at from 673K to 873K increases with the sintering time, but pore in the compact is not changed after the long sintering time. On the other hand, when the sintering was carried out at high temperature for short time, the hardness of the compact decreases and then reaches to constant value, but the density increases. Fracture strength of the sintered compact increases, and formation of the titanium diborid becomes more frequent with increasing of the sintering temperature. It is observed that the copper-rich phase forms at contact region between the particles in the compact sintered at high temperature, and it brings on the high fracture strength.抄録全体を表示PDF形式でダウンロード (3949K) -
高橋 和彦, 保科 栄介1994 年 41 巻 3 号 p. 281-284
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーIn order to lighten the weight of connecting rods, which are put into service with the surface as forged, mechanical properties, especially fatigue strength of the forged surface should be improved. In powder forged material, surface defects such as decarburized layer, surface roughness, and non-sintered area(NSA) are observed. This NSA, peculiar to this material, plays the most important role in determining the mechanical properties.
In order to develop the optimum strengthening process, the authors focused on this NSA and microscopically observed the microstructure and fractography to quantify the defect, using the ratio of NSA versus the cross sectional area. In addition, the effect of manufacturing conditions on the NSA production mechanism was quantitatively analyzed. As a result, NSA are caused by particle interface oxidation, thought to occur before forging via open-pores.抄録全体を表示PDF形式でダウンロード (2802K) -
高橋 和彦, 保科 栄介1994 年 41 巻 3 号 p. 285-288
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーIn order to lighten the weight of connecting rods, which are put into service with the surface as forged, mechanical properties, especially fatigue strength of the forged surface should be improved. In powder forged material, surface defects such as decarburized layer, surface roughness, and non-sintered area(NSA) which is peculiar to this material are observed.
In order to develop the optimum strengthening process, the authors quantitatively analyzed the effects of these surface defects on mechnical properties. As a result, NSA acts as a notch as well as decreasing the effective cross sectional area, and is the dominant factor which reduces fatigue strength among these surface defects. In the case of P/F material which has no NSA at all, effects of decarburization and surface roughness are mostly the same as carbon steel. In order to improve the fatigue strength noticeably, the NSA should be completely removed.抄録全体を表示PDF形式でダウンロード (254K) -
渡辺 真, 安藤 新二, 山口 敏彦, 三浦 秀士, 本田 忠敏1994 年 41 巻 3 号 p. 289-292
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーThe tensile strength of sintered iron and alloyed iron compacts have been analyzed statistically by using three types of iron powders produced by different process. The results obtained were summarized as follows:
(1) The tensile strength of all sintered iron compacts were scattered according to the normal distribution curves in spite of difference in material and the sintered density.
(2) Sintered iron compacts produced by fine powder showed the highest tensile strength. The coefficient of variation in tensile strength had a tendency to become high as the iron powder particle size is increasing and the density of sintered compact is decreasing.
(3) The tensile strength and its coefficient of variation in sintered compacts produced by blended iron powder were similar to those of compacts produced by single powder.
(4) The coefficient of variation in tensile strength of sintered alloyed iron compacts was increased with addition of Cu, while the addition of Ni had slightly influence on the coefficient of variation.抄録全体を表示PDF形式でダウンロード (303K) -
祖父江 昌久, 酒井 淳次1994 年 41 巻 3 号 p. 293-296
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーComputer program which simulates the unidirectional slip casting process has been developed. The equation used to calculate the dewatering rate is derived based on Darcy's law and the Carman-Kozeny equation. This obtainted equation can calculate the dewatering rate through a porous material composed of many layers with different particle packing densities. As an another program feature, the particle packing density of the slip cast layer is correlated to the dewatering rate. First the dewatering rate is calculated through the first element, and next the density of the second element is predicted. Slip casting process can be simulated by repeating such calculations. This program also calculates the casting pressure which provides each element with a predetermined particle packing density by controlling the dewatering rate.抄録全体を表示PDF形式でダウンロード (207K) -
高橋 清造, 中川 威雄1994 年 41 巻 3 号 p. 297-300
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーDeep cup shaped compacts of diameter: 20 mm, wall height: 30 mm and wall thickness: 2 mm, were formed by uniaxial pressing using a single stepped punch from loose alumina granule which could attain sufficient flowability by admixing more than 5 wt% liquid paraffin. Loose granule flowed for forming from higher densified cup at the bottom to a lower density at the cup wall at a certain compacting pressure by the addition of liquid paraffin. According to experimental results, the density of cup wall improved by increasing the addition of liquid paraffin and the difference in density distribution in green compact could be reduced. The dimensional variation on diameter of sintered compact formed by the addition of 6.7wt% liquid paraffin under compacting pressure 196 MPa could be 0. 24 mm by sintering for 3 hr at 1550°C.抄録全体を表示PDF形式でダウンロード (3246K) -
石橋 利之, 秋岡 宏治, 下田 達也1994 年 41 巻 3 号 p. 301-304
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーProduction of resin bonded rare-earth magnets is growing rapidly. Considerable effort has been directed toward inproving the properties of the magnetic powder for the purpose of high performance resin bonded rareearth magnets. Little attention, however, has been paid to the bonding technology.
In this paper, the densification behavior of compression molded resin bonded rare-earth magnets which consist of isotropic Nd-Fe-B powder, epoxy resin and lubricants was studied.
The results obtained are summarized as follows:
(1) The local density in the compact decreases linearly and the local pressure drops exponentially with increasing distance from the pressing punch.
(2) This pressure drop is caused by the friction between the compact and the die walls.
(3) Suitable lubricants improve compressibility and result in high density and a corresponding high energy product.抄録全体を表示PDF形式でダウンロード (214K) -
王 徳平, 加計 一郎, 辻 一弘1994 年 41 巻 3 号 p. 305-308
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーColoration is an important effect in zirconia ceramics. We have observed a phenomena of coloration on the surface of 3mo1%Y2O3-doped zirconia in sintered processing used some of new refractory. XPS, TG and IR analyses have proved that the problem is caused by the influence of residual impurities in the refractory.
The authors however have found a interested results that the phenomena was improved by reheating the refractory in the high temperature for several times before using, and the doping of Y203 or A1203 content into ZrO2 ceramics(PSZ) has improved the coloration.抄録全体を表示PDF形式でダウンロード (255K) -
大西 康司, 豊田 幸夫1994 年 41 巻 3 号 p. 309-312
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーGrinding experiments on photoelectric material, PLZT, have been carried out with various types of diamond grinding wheels. The grinding strain is measured by a photoelastic technique. The experimental results show that removal formation on the ground side surface is not concerned with abrasive grain size. On the other hand the occurrence of grinding strain is dependent on a removal formation at finishing surface.抄録全体を表示PDF形式でダウンロード (3674K) -
大原 泰源, 中別府 哲也, 田中 伸一, 四方 良一, 神原 雄三, 山崎 雄右, 三木 康夫1994 年 41 巻 3 号 p. 313-316
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーPorous alumina ceramics having a sandwich panel structure which consists of a porous layer sandwiched in the two thin high-density layers were prepared by the solid casting method using an alumina slip added air foam. Mechanical properties of the porous alumina ceramics with porosity of 10 to 80% were measured. The average bending strengths showed the higher values, e.g., 100MPa at 40% porosity and 20MPa at 75% porosity, as compared with customary porous alumina ceramics. The bending strength decrease of the porous alumina ceramics with porosity was not so high as an empirical equation by Coble and Kingery. It was considered that the enhancement of bending strength resulted in the existence of high-density layers at surface of porous alumina ceramics.抄録全体を表示PDF形式でダウンロード (2367K) -
岸 雅宣, 亀田 裕和, 田中 謙次, 南井 喜一1994 年 41 巻 3 号 p. 317-320
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーThe boundary layer capacitor consists of grains as semiconductor and boundary layer as dielectric, and the apparent permittivity of boundary layer capacitor is proportional to grain size. It was studied how to control grain size and apparent permittivity of boundary layer capacitor with seed grains.
The seed grains were produced by grinding the sintered body with same composition of main material. The average particle size of seed grains was about 6 times as large as that of main material.
The grain size(D) and apparent permittivity(εr) of boundary layer capacitor depended on the amonunt(N) of seed grains. Then the relationships among these variables were investigated by using model of grain growth, and could be expressed easily using the following equation,
εr=αD=αN1/3 (α, β:coefficient).
And the apparent permittivity of boundary layer capacitor increased to 1.4 times of the original value, when the grain size was controlled with seed grains.抄録全体を表示PDF形式でダウンロード (1414K) -
L12構造のAl3Ti相の生成森下 政夫, 香山 滉一郎, 田中 謙太郎, 村瀬 百慶, 森永 正彦, 足立 裕彦1994 年 41 巻 3 号 p. 323-330
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーNickel was added to improve the ductility of a new reaction sintered Al-Ti-N alloy which consists of A13Ti and A1N phases. The added Ni transformed the crystal structure of Al3Ti from DO22 to a high symmetry L12, and as a result, improved the ductility of the alloy.
The DV-X α molecular orbital calculation suggested that Ti atoms were able to locate at the 2nd neighbor sites of Ti atoms by substitution of Ni atoms for a part of Al atoms, namely, the 1st neighbor sites of Ti atoms. This atomic configuration is the mechanism for the stabilization of the L12 crystal structure of AI3Ti by the addition of Ni.抄録全体を表示PDF形式でダウンロード (3727K) -
廣瀬 徳豊, 浅見 淳一1994 年 41 巻 3 号 p. 331-334
発行日: 1994/03/15
公開日: 2009/05/22
ジャーナル フリーCarbonyl nickel sintered compacts were observed with an acoustic microscope. The specimens were compacted under pressure of 98-98OMPa, and were sintered at 1073K for 3.6ks in hydrogen atmosphere. The results were as follows.
1)In the case where compacting pressure was more than 490MPa, pores were almost closed.
2)When pores were almost open, peaks of V(z) curve did not appeared. According to increase of closed pores, however, these begun to be shown at defocus value of-17μm and-30μm.
3)In the case of comparison of optical and acoustic images, pores which can not appeared clearly on specimens surface by the former were emerged as characteristic images by the latter.
Therefore, as results of observation of surface and subsurface pores in acoustic microscopy, this technique suggests interesting and unique information different from optical images for distribution and connection of pores in fine powder sintered compacts.抄録全体を表示PDF形式でダウンロード (5340K) -
山本 康一, 酒井 健至, 坂本 雅昭1994 年 41 巻 3 号 p. 335-339
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーSintered lead bronze alloys with steel backing have been widely used as the bearing material of wrapped type bushings, because of their high loading capability and wear resistance under the boundary lubrication. Small end bearings of connecting rods in the automotive engines are the typical application of these.
As the recent automotive components are applied on severe conditions, such as higher load, higher temperature, newly advanced materials have been demanded for bearings having properties of higher loading capability, lower friction loss or better wear resistance.
Authors have studied on a new sintered Cu-Sn-P-Pb-Graphite bearing material with steel backing for such demands as the above by carrying out the friction and wear tests with the bushing type test machine and also, by conducting the engine bench test for the small end bearing of connecting rod.
Through these tests it was found that this Cu-Sn-P-Pb-Graphite material showed better friction and wear properties, compared with conventional lead bronze, due to the better alloy structural stability of the material itself against the high load under the high temperature and the solid lubricating effect of dispersed graphite in the material, at the condition of metalcontacting with the shaft.抄録全体を表示PDF形式でダウンロード (2763K) -
粉砕及び摩耗特性の検討岸川 勉, 村井 匠, 佐竹 幸治, 竹原 尚夫, 中山 義博, 清水川 涼一, 佐藤 恵二, 高橋 恒1994 年 41 巻 3 号 p. 340-343
発行日: 1994/03/15
公開日: 2009/12/04
ジャーナル フリーElectrolytic Manganese Dioxide (EMD) is in general used for dry-batteries. This paper describes the physical properties of EMD, such as grinding, wear and crystal structures of BET surface area. The results obtained as follows;
1)Grinding index increases continuously with increase of BET surface area. Range of work index(Wi) is 14-22 [KWH/T] .
2)Lattice parameter b increases with increase of BET, accompanied with decrease of crystalline size and increase of distorsion.
3)Wear index decreases with increase of BET surface area and also with decrease of particle size.抄録全体を表示PDF形式でダウンロード (270K)
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