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Volume 35, Issue 7
Displaying 1-34 of 34 articles from this issue
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[in Japanese]1988 Volume 35 Issue 7 Pages 574
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (54K) -
Masaaki Tokunaga1988 Volume 35 Issue 7 Pages 575-579
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThere have been 3 types of powders for Rare Earth bonded magnets. They are 1/5 Sm-Co, 2/17 Sm-Co and Nd-Fe-B powders. The Nd-Fe-B bonded magnets are isotropic. For higher energy products anisotropic bonded magnets are required.
Examining the process parameters and evaluating additional elements, Nd14Fe79.25B6Ga0.75 die upset magnet was developed as a starting material for anisotropic bonded magnets. The coercivity of die upset magnets after pulverizing is almost independent on the particle size. Anisotropic bonded magnets made from pulverized die upset magnets were developed. (BH).max values of 10 and 15 MGOe were obtained for injection and compression molded magnets, respectively. These magnets have enough thermal stability with irreversible losses under 5 % after exposure to 120°C(Pc=2).View full abstractDownload PDF (254K) -
Kenji Ohmori, Jun-ichi Ishii, Takashi Ishikawa, Kenji Sato1988 Volume 35 Issue 7 Pages 580-583
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSRare-earth bonded magnets using two kinds of NQ powder are developed. The magnetic properties of them are comparable to those of Sm1Co5 bonded magnet, if they are fully magnetized. But it is necessary to use magnetizing field larger than 20k0e which is an upper limit for iron yoke. Temperature characteristics of the. are worse than those of Sm1Co5. There are little problem for corrosion resistance if they are produced with NaCl as little as possible and coated with thin plastic film.View full abstractDownload PDF (205K) -
Koji Akioka, Ken Ikuma, Tatsuya Shimoda1988 Volume 35 Issue 7 Pages 584-588
Published: October 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSThis paper describes the magnetic properties of resin-bonded magnets having the composition R(Co.672Cu.08Fe.22Zr.028)8.35. This composition is able to possess a high intrinsic coercivity(iHc) only when Sm is adopted as the rare earth element. We studied the effects of partial substitution of Sm with Pr in Sm(TM)8.35. The obtained results were as follows:
1) Saturation magnetization increased and the optimum solid solution heat treatment temperature decreased as the Pr content was increased.
2) Magnetic properties such as (BH)max=14.5MGOe, Br=8.1kG, iHc=10.6k0e were achieved in Sm.5Pr.5(TM)8.35 resin bonded magnet. The achieved values are comparable to those of Sm(TM)8.35 magnets.View full abstractDownload PDF (241K) -
Takayuki Nishio, Kunihiko Kondo, Hideo Koshimoto, Yoshiro Iwama1988 Volume 35 Issue 7 Pages 589-592
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSMagnetic properties are investigated for ribbon specimens melt-spun under an optimal quenching rate of 16 m/sec. Their compositions are quaternary, discribed as Nd13.3(Fe, M)80 B6.7 (M=Al, Ga, Co). Results obtained are summarized as follows:
(1) X-ray diffraction patterns for a ternary ribbon with Nd13.3 Fe80B6.7 composition reveals that the 2-14-1 phase has no preffered orientation. The demagnetization curve is of regular shape and exhibits the coercive force of 14.9 k0e.
(2) The addition of suitable amounts of Al or Ga to the ternary ribbons improves the room temperature coercive force without introducing the serious decrease in Curie temperature.
(3) With Cc addition, paticularly, it is found that the Curie temperature and the coercive force are simultaneously improved, which is seemed to be characteristic for rapidly quenched ribbon and has never reported for sintered magnet.View full abstractDownload PDF (194K) -
[in Japanese]1988 Volume 35 Issue 7 Pages 594
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (57K) -
Shinji Yamada, Akira Sugafuji, Tetsuya Matsuda1988 Volume 35 Issue 7 Pages 595-598
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSRecently self-lubricating composite materials have been frequetly used for metal forming machines and the sliding part of their dies, as well as components of general industrial machines.
The properties required in paticular are wear resistance, resistance to impact, low coefficient of friction and capability to be formed into diverse shapes.
As a result of having examined the composite materials suitable for advanced applications from various points of view, we investigated the sintered material of Cu-Ni-Sn-Fe-P-Graphite system.This material was made porous using powder metallurgical technique.In order to improve impact resistance of sintered material, steel was used as a backing material.
We examined the method of applying diffusion bonding during the sintering process of the material. Attention was given to the fact that there is a limit to the capacity of press forming machine.Therefore the method of direct powder rolling was used.View full abstractDownload PDF (3559K) -
Susumu Shima, Takayuki Kondou, Mohamed A.E. Seleh1988 Volume 35 Issue 7 Pages 599-602
Published: October 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSAn alumina (Al2O3) powder is isostatically compacted at room temperature and the density ratio achieved is measured. The mean density is compared in terms of the size of the compact, however, there is no significant size effect. The characteristics of compaction behaviour of ceramic powder is quite different from that of metallic powders. Taking account of the difference into the constitutive equations for the powder, Lhe rigid-plastic finite element analysis of CIP is carried out and the results are compared and discussed.View full abstractDownload PDF (236K) -
Hiroyuki Mizuta, Yasuo Shibasaki, Shinji Tomura, Yuzo Kato1988 Volume 35 Issue 7 Pages 603-605
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSIn order to investigate the effect of exchangeable cations on rheology of clay body, plasticity of the synthetic kaolinite body whose surface cations were replaced by a particular one were measured by using Pfefferkorn methods. Unfrozen water (binding water) on the synthetic kaolinite surface were also measured by using low temperature differencial scanning calorimetory to estimate the binding forth of cations with water. Following results were obtained.
1) The plasticity is encouraged by exchanging cations on synthetic kaolinite surface.
2) Thickness of unfrozen water on the kaolinite surface is about 9-13Å.
3) Plasticity and thickness of unfrozen water film on the synthetic kaolinite closely relate to ionic radius and hydration energy of exchanged cation.View full abstractDownload PDF (175K) -
Yasuo Shibasaki, Hiroyuki Mizuta, Shinji Tomura, Ritsuro Miyawaki, Yuz ...1988 Volume 35 Issue 7 Pages 606-609
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSα-Fe2O3 fine powders prepared by oxydation of Fe3O4 and by dehydration of α-FeOOH show different plastic properties of the body. The dependence of the plastic properies on the surface conditions and pore volumes of the α-Fe2O3 fine powders were examined by BET method (N2 gas) and DSC. All values of the plastic properties of the body, the surface area and pore volume of α-Fe2O3 powder prepared by dehydration of α-FeOOH are higher than those of the α-Fe2O3 powder prepared by oxidation of Fe3O4. The water molecules absorbed in pores with radius within 20A on α-Fe2O3 particle can be estimated as condensed capillary water and/or non-frozen water.View full abstractDownload PDF (222K) -
Masafumi Arakawa, Hideki Kobayashi1988 Volume 35 Issue 7 Pages 610-613
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe relation between the floculation state of the fine particles in slurries and the forming process and packing structure on the surface of gypsum mold was discussed. In conclusion, the dence and homogineous body can be take at the good dispersed slurry.View full abstractDownload PDF (242K) -
Hitoshi Oumizono, Takeo Sasaki, Hiroshi Sasaki, Hiroki Miyamoto1988 Volume 35 Issue 7 Pages 614-618
Published: October 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSMuch effort has been made on the R&D of value-added ceramic products with more complicated geometry for structural materials.Forming method, however, is a key and formidable task to make those products. Among others, a slip casting has been focused onas an economical method.This paper presents the results of the slip casting of MgO using organic solvents:
(1) Based on the evaluation of consolidating characteristics, high quality green moldings were obtained by using 2-ProOH which proved to be best one among the candidates for organic solvent.
(2) The consolidating velocity constant, largely well accepted in the case of using aqueous solvents, was also well justified in our tests with organic solvents.
(3) While there was some variation of consolidating characteristics according to the type of organic solvent.View full abstractDownload PDF (216K) -
Hiroyuki Mizuta, Yasuo Shibasaki, Kiyosuke Sakai, Makoto Katagiri, His ...1988 Volume 35 Issue 7 Pages 619-624
Published: October 25, 1988
Released on J-STAGE: July 12, 2010
JOURNAL OPEN ACCESSSlip casting method for submicron high purity alumina was developed by optimizing the concentration of slip and dispersant, and using resin mold as a substitute for plaster and apparatus with vacuum⋅pressure system. The results obtained were summarized follows:
1) High density green body (>60%) was obtained.
2) High strength alumina (700-800MPa) was obtained after sintering the body at 1250-1300°C. This value is equal to that of alumina sintered under HIP and HP at 1500-1600°C.
3) This high strength comes from uniformally controlled small grain size(1-3μm) of sintered body which results in grain fracturing instead of grain boundary fracturing of conventional alumina ceramics.View full abstractDownload PDF (1310K) -
Masato Imamura, Akira Yanagisawa, Hiroyuki Noguchi, Takeo Nakagawa1988 Volume 35 Issue 7 Pages 625-628
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSPorous metal with complicated shape can be produced by slurry casting followed by sintering. Iron base porous metal was experimentally carted using 19wt% etyl silicate binder which has volatile and self hardening properties in order to obtain the sufficient porosity and green strength for handling without consuming long drying time. Further the addition of fine short metal fiber made not only the increase of green and sintered products but also the uniformity of material composition in the casting. By selecting suiutable material and casting conditions, maximum bending strength of 2500kgf/cm2 with 24% porosity was obtained in 8% dimensional shirinkage and 32% porosity with 300kgf/cm2 bending strength in a almost 0% shirinkage.View full abstractDownload PDF (3621K) -
Giving One Dimensional Surface Porosity by Combining Electrostatic Fiber PlantingMasato Imamura, Akira Yanagisawa, Hiroyuki Noguchi, Takeo Nakagawa1988 Volume 35 Issue 7 Pages 629-632
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSPorous metal which has one directional porosity perpendicular to the surface, can be produced by the combination of slurry casting and fiber planting. First, fine short metal fiber is planted on the surface by electrostatic fiber planting, i.e.flocking and secondly metal powder slurry including ethyl silicate binder is casted on the fiber planted surface. At the subsequent sintering, metal powder is melted and infiltrated into metal powder matrix, which yieds long and one directional pores. Here, Cu fiber and Fe powder are used and electric coinductive vacuum chuck for grinding was experimentally producted.View full abstractDownload PDF (3475K) -
Kei Miyamoto, Yuzuru Takahashi, Suguru Inamura, Hiroki Miyamoto1988 Volume 35 Issue 7 Pages 633-635
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSGreen compacts of Si3N4 were preparated by the low pressure injection molding method. The slurries containing 15wt%, 17wt% and 20wt% organic binder by the ball mill mixing method were tested. The good green compacts were obtained from the slurries in the range of 17wt% to 20wt%. The specimen sintered at 1850°C for 3 hrs in N2 atomosphere of 9 kgf/cm2, from the slurry of 17wt%, shows a strength of 86.7 kgf/mm2 and its Weibull constant is 7.2.View full abstractDownload PDF (144K) -
Tohoru Takeda, Kazumi Minagawa1988 Volume 35 Issue 7 Pages 636-640
Published: October 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSSKH51 high speed steel powders with the specific surface area diameter of 3-6μmand the tap density ratio of 53% and over were produced by the super high pressure water atomization.
With the use of Acrawax C as the binder of these powders, the extrusion properties of the mixture, dewaxing conditions and sintering properties of compacts were examined. Powders mixed with 4.5-6.0 mass% wax showed the apparent viscositiy of 3-5*103 Pa s at the shear rate of 103S-1. Compacts contained the closed porosity (εc) of 4-5%. these pores (mean radious r, surface tensionγLV) induced the hydrostatic pressure ∞(-2γLV/r)εc to the outer surface of the compact, then the wire shape resulted to be held with a suitable accuracy. Farther additions of the wax led the mixture to flow under gravity. The wax of the compact removed without any crack formations at the heating rate of 0.17K/s.Dewaxed compacts showed good sintering properties.View full abstractDownload PDF (3464K) -
Junjiro Takekawa1988 Volume 35 Issue 7 Pages 641-645
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe injection characteristics and the sintering behaviors of binary mixture of stainless steel powders having diffrent particle sizes were investigated. Two types of SUS316L powder, the higher-pressure water atomized powder (SF, d=9.72μm)and the gas atomized powder(GA, d-25μm)were used. The results obtained were as follows.
1)With decreasing the SF/GA ratio, the amount of required binder for injection molding could be diminished and the apparent density of molded compacts increased.
2)Sinterability of the molded compacts markedly increased with increasing the SF/GA ratio, while the increase of the ratio tended to result excessive grain growth when sintered at temperature above 1250°C. 3)Injection molded compacts showed uniformly distributed fine spheroidized pore structures as compared to those of die pressed compacts, after sintering.View full abstractDownload PDF (2070K) -
Yasunari Kaneko, Kei Ameyama, Katsuyoshi Saito, Hiromichi Iwasaki, Mas ...1988 Volume 35 Issue 7 Pages 646-650
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe injection molding of Ti powder(30μm in average diameter)was carried out with the PBMA(polybutyl-metacrylate)-EVA(etylene-vinyl acetate copolymer)-wax binder system. Ti powder was mixed with the binder at 140°C.The molding composition was 56%Ti powder, 17%PBMA, 21%(EVA+wax) and 6%dibutyl phthalate in volume. The green was debinded during heating from room temperature to 300°C in the air. The debinded specimen was sintered at 1100 and 1300°C under a vacuum of 10-2 Torr. The main results are summarized as follows:
1)This binder system has good mixing, molding and binder removal characteristics.
2)A specimen sintered at 1300°C for 2hr has a relative density of 94.0% and shows strength of 1000MPa.
3)Sintered specimens are all fractured brittle.View full abstractDownload PDF (1166K) -
Yoshinari Miyamoto, Yo Chul Hyun, Yoshishige Takano, Osamu Yamada, Mit ...1988 Volume 35 Issue 7 Pages 651-654
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSTitanium diboride based ceramic composites in the systems of TiB2-TiC and TiB2-SiC were fabricated without sintering aids by a high pressure combustion sintering process. They were synthesized and densified simultaneously from pelleted mixtures of the stoichiometric composition of Ti and B, and the powders of TiC or SiC added ( 0, 5, 10, 20, 30 wt% ) by initiating highly exothermic reaction of TiB2 formation under 3GPa.
The particles of TiC and SiC were uniquely dispersed in TiB2 matrix without producing other compounds. For TiC additions, ther bulk densities of the composities were in the range of 95-96% of theoretical, and the Vickers microhardness and fracture toughness improved. In the case of SiC addition, the sinterability tended to be lowered.View full abstractDownload PDF (1650K) -
Hideshi Miura, Tadatoshi Honda, Hirofumi Muraba1988 Volume 35 Issue 7 Pages 655-661
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSExplosive compaction of ceramic powders, mainly SiC powder, was performed using by cylindrically axi-symmetric direct method. The effects of the type and mass of explosive and the material and construction of compacting container on the compactibilities of ceramic powder have been investigated by means of microhardness test, optical microscopy, scanning electron microscopy and density measurements.
Hardness of specimen compacted by explosive with slow detonation velocity (2.1-2.4Km/s) was higher than that of specimen compacted by explosive with fast detonation velocity (6-7Km/s) because of long shock duration time. In the case of using the former explosive and Cu tube for compacting container, and at the ratio of explosive mass to powder mass (E/M ratio) more than 200, the specific density ratio of the compact reached about 90%. However, hericoidal and radial cracks were formed in the compact because of the convergence of the shock wave and the interference of the reflected waves.
In the explosive compaction of Si3N4 powder, crack was little formed in the compact. This may be ue to the superior thermal properties of Si3N4, such as smaller thermal expansion and higher strength at high temperature.View full abstractDownload PDF (3530K) -
[in Japanese]1988 Volume 35 Issue 7 Pages 664
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (78K) -
Kanji Notomi, Tatsuo Yamasaki, Tomiharu Matsushita, Nobuyasu Kawai1988 Volume 35 Issue 7 Pages 665-668
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSA new HIP process using visco-plastic pressure medium, named "Q-HIP Process", has been developed. In this process, capsulized powder was charged into pressure vessel with a lump of visco-plastic pressure medium, and compacted with a stroke of piston. Compaction in the "Q-HIP Process" was done isostatically as well as that of conventional gas HIP. In this study, three kinds of gas atomized tool steel powders (adamite steel, SKD 11 steel and KHA 30 steel) were completely compacted in a few minutes. Consolidated materials through this process proved to have similar micro-structure, bend strength and tensile properties to that of gas HIP'ed product.View full abstractDownload PDF (3632K) -
Hiroshi Hamamoto, Mikip Kondoh, Takao Kobayashi, Kazuhiko Itoh, Kazuak ...1988 Volume 35 Issue 7 Pages 669-672
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSIn order to clarify various properties of DS copper alloys made by hot repressed of internally oxidized Cu-0.33%Al powder, effects of forging temperature, attritor grinding and atomic ratios of O/Al on mechanical properties and electrical conductivity were investigated. Mean density was increased with increasing of forging temperature, and mechanical properties were also improved. About 99.7% of theoretical density was obtained when the forging temperature was above 900°C. Mechanical properties, especially elongation, of the specimens were improved by using attrited powder. The optimum mechanical properties and electrical conductivity were obtained when the atomic ratio of O/Al was nearly equal to 2.2. The anisotropy of strength at elevated temperatures was negligibly small compared with that of the commercial extruded DS copper alloys.View full abstractDownload PDF (1248K) -
Shinichirou Kakehashi, Masato Ohtsuki, Tohru Kohno1988 Volume 35 Issue 7 Pages 673-676
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSEffects of working conditions on mechanical properties of the heat resistant Al-9Fe-1.5V-1Zr powder forged or extruded alloy were investigated. The forging reduction ranged from 10 to 47% and the extrusion ratio was 25. The tensile strength and elongation increased with the reduction ratio. These dependency decreased in the case of elevated-temperature tension test. It was considered that the bonding strength between the powders due to the break-up of oxide film of the powder surface increased with the reduction ratio and that this effect of strengthening decreased with temperature due to the softening of matrix with temperature.View full abstractDownload PDF (2607K) -
[in Japanese]1988 Volume 35 Issue 7 Pages 678
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (60K) -
Mitsuhiko Sato, Kiyohito Okamura, Shunichi Kawanishi, Tadao Seguchi1988 Volume 35 Issue 7 Pages 679-682
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe radiation effects on polycarbosilane were investigated by ESR and gas chromatography measurements, in order to clarify the radiation curing mechanisum of polycarbosilane fiber as a precuser of ceramic fibers. The radio-chemical yields (G-value) of polycarbosilane were 2.5±0.5 for radical formation at 77K and 1.4±0.1 for hydrogen evolution at room temperature, respectively. Most of the radicals reacted with each other, and polycarbosilane molecules were crosslinked under vacuum. At room temperature some of the radicals, which didn't contribute to the crosslinking, were trapped and were fairly stable under vacuum, but were well oxidized by the exposure in air. In the presence of oxygen, the radicals reacted rapidly with oxygen to convert to oxidation products, and the G-values were much more than the radical's one. The oxidation of trapped radicals in polycarbosilane must be decreased in the radiation curing process, in order to exclude oxygen in silicon carbide fiber.View full abstractDownload PDF (257K) -
Satoshi Nakamura, Hiroaki Niwa, Kazuo Saito, Soji Miyagawa, Yoshiko Mi ...1988 Volume 35 Issue 7 Pages 683-687
Published: October 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESS100keV N+2 ions were implanted into deposited-Ti and bulk-Ti with the dose of 1X1017-1X1018ions/cm2 at the temperature from R.T. to 1000°C. The surfaces were studied by Rutherford backscattering spectrometry(RBS), scanning electron microscopy(SEM), X-ray diffraction and Knoop-hardness measurement.
When implantation dose was 5X1017ions/cm2, the formed layer had the chemical composition of Ti:N=1:1 and the thickness of 1000-2000Å. It was found that the appropriate temperature to form TiN layer is about 600°C. At the temperature below 400°C, blisters were formed and TiN crystals didn't grow up and the hardness didn't rise notably. At the temperature above 800°C, implanted nitrogen diffused quickly and lost, thereby TiN layer wasn't formed and the hardness didn't rise. It was also found that the formed TiN structure depends on the structure of Ti substrate.View full abstractDownload PDF (1224K) -
Susumu Sato, Masaya Iwaki1988 Volume 35 Issue 7 Pages 688-691
Published: October 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSA study has been made of electric conductivity and structure of Ar ion implanted diamonds depending on the target temperature during Ar implantation. A 150 keV Ar implantation into natural la-type diamonds held at the temperatures ranging from -60 to 300°C was performed with doses of 2-6×1016 ions/cm2. The sheet resistivity was measured by a four point probe method at room temperature. The sheet resistivity was varied depending on target temperatures by two or more orders of magnitude; The critical target temperature giving remarkable change in the resistivity was nearly equal to room temperature. Raman spectra showed that the surface structure is amorphous in the specimen implanted at the target temperature of -60°C and is disordered-graphite including amorphous zones in the one at the target temperature of 200°C.
It is concluded that the final target temperature plays an important role in forming the different structures in implanted diamonds to change the sheet resistivity. When we implant Ar-ions in 200°C-implanted diamonds at -60°C or in -60°C-implanted diamonds at 200°C, the sheet resistivity shows to be dependent on the final temperature at the final stage of ion implantation.View full abstractDownload PDF (208K) -
Takanobu FUJIHANA, Masaya IWAKI1988 Volume 35 Issue 7 Pages 692-699
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSA study has been made of the structure and sheet resistivity of metal implanted silicon. The substrates used were (100) oriented single crystal silicon wafers. The iron, nickel and copper ion implantations were performed with doses ranging from 7.5×1016 to 5×1017ions/cm2 at an energy of 150 keV. The depth profiles of implanted atoms were estimated by Rutherford Backcattering spectroscopy (RBS). The identification of silicides produced by implantation were performed by X-ray diffraction (XRD). The sheet resistivity measurements were carried out by using a four point probe method. The maximum concentration of implanted atoms for the highest dose samples existed near the silicon surface, and silicides composed of silicon and implanted metals were formed in the implanted layers. The sheet resistivity of iron and nickel implanted silicon decreased extremely with increasing the dose, but in the case of copper implantation it did not so. These results suggest that silicides can be formed in implanted layers without any thermal annealing, but all of metal implantations do not cause the resistivity to decrease.View full abstractDownload PDF (358K) -
Yoshiaki Kido1988 Volume 35 Issue 7 Pages 700-703
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe kinetics and grain growth mechanism in ion beam mixing have been investigated for the AI-Mn system. First, we determined the temperature dependence of mixing rate using Rutherford backscattering and then the phases formed by ion beam mixing were characterized by x-ray and electron diffraction analyses. The present experiments demonstrate that the residual diffusive motion is the decisive factor for direct formation of the various phases of intermetallic AI-Mn alloys. The residual diffusivity depends strongly on the mixing temperature and its relaxation time ranges from 10-12 up to l0-6 sec or longer. Finally, a model describing the ion beam mixing effect is proposed.View full abstractDownload PDF (244K) -
Formation of High Pressure PhaseShoji Noda, Osami Kamigaito1988 Volume 35 Issue 7 Pages 704-707
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSCrystalline phase transformation from α-phase to ω-phase(high pressure phase) was found to occur in Zr thin film on sapphire when it was irradiated with N+ or Ar+ions at low temperature. Ion irradiation at ambient temperature caused only grain growth of the α-phase. The ω-phase formation is tentatively attributed to crystal growth in collision cascade under large compressive stress which was generated by preceding irradiation.View full abstractDownload PDF (178K) -
Masao Kohzaki, Shoji Noda, Haruo Doi, Osami Kamigaito1988 Volume 35 Issue 7 Pages 708-711
Published: October 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSMasao Kohzaki, Shoji Noda. Haruo Doi and Osami Kamigaito : Improvement of The Tribological Properties of Ceramics by Si Film Deposition and Ion Irradiation.
We studied the tribological properties of surface modified SiC ceramics with a pin-on-disk friction and wear tester in an ambient atmosphere without oil lubrication. The friction coefficient between Si film deposited SiC(Si/SiC) and a diamond pin was about 0.05, which was smaller than one half of that between SiC and a diamond pin. The low friction state of Si/SiC lasted for 40 hours when the Si/SiC was irradiated with Ar+ ions. Ar+ ion irradiation was also effective for reducing the wear. Effectively no wear was detected in Si/SiC irradiated to the dose over 5 × 1015 ions/cm2.View full abstractDownload PDF (1030K) -
Akio Itoh, Tatsumi Hioki, Jun-ichi Kawamoto1988 Volume 35 Issue 7 Pages 712-715
Published: October 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSPolycrystalline SiC was implanted with Ar+ ions, in order to investigate the effect of ion-implantation on the tribological properties of the ceramics. By Ar+ ion implantation, the friction coefficient μ for a steel(SUJ2) pin sliding against SiC disk was found to he decreased remarkably. Results from Raman spectroscopy indicated that the observed reduction in μ is related to the amorphous surface layer produced by the implantation.View full abstractDownload PDF (1380K)
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