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Volume 35, Issue 3
Displaying 1-33 of 33 articles from this issue
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[in Japanese]1988 Volume 35 Issue 3 Pages 86
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
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Shigenori Yamauchi, Kazuhisa Shibue, Hideo Sano, Yoshimasa Ohkubo1988 Volume 35 Issue 3 Pages 87-90
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSGas atomization is widely used for rapid solidification of aluminum alloys. However, ultra-rapid solidification process is required instead of gas atomization in order to modify the properties of P/M alloys, especially of the dispersion-strengthened Al-Fe alloys. To meet this requirement, atomization-rolling process, which was the combined process of gas atomization and single roller, has been being developed by the authors. In the present work, various Al-Fe alloys were rapidly solidified by means of atomization-rolling process, and consolidated by hot extrusion. Microstructure and tensile properties were evaluated in comparison with the alloys by gas atomization. Results obtained were (1) cooling rate of atomization-rolling process was 105-107°C/sec which was higher than gas atomization, (2) extruded alloys had higher strength at room and elevated temperature than the alloys by gas atomization, which was due to the finer dispersion of the intermetallic compounds by atomization-rolling process, and (3) Al-8%Fe-2%V-2%Mol%Zr alloy by atomization-rolling process had very high strength at elevated temperature. These results indicated that the atomization-rolling process was promising as the ultra-rapid solidification process.View full abstractDownload PDF (3662K) -
Tomio Satoh, Kunio Okimoto, Minoru Nishida, Kihachiro Imamura, Akira C ...1988 Volume 35 Issue 3 Pages 91-95
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSZn-22Al pre-alloy powders were fabricated by air-atomized, argon-atomized and rapidly solidified methods. The rapidly solidified powder was fabricated by centrifugal atomization method. To improve the superplasticity of the air-atomized and argon-atomized powders, a simple heat-treatment of the powders, i.e, rapid cooling after heating at 380°C for half an hour, was attempted. Microstructures of the rapidly solidified and the heat-treated Zn-22Al pre-alloy powders were observed by optical microscope, SEM and TEM. It was found that the microstructures of the heat-treated powders were refined and granulated, and that also the grains became equiaxed in shape.
Compactibility of the rapidly solidified powder was inferior to those made from the air-atomized and argon-atomized powders, because the shape of the rapidly solidified powder was nearly spherical. However, the refinement and homogenization of the rapidly solidified powder was almost same to those of the heat-treated powders and elongation of the compact reached about 1000%.View full abstractDownload PDF (4754K) -
Takashi Sato, Takashi Taniguchi, Ken-ichi Kondo, Akira Sawaoka1988 Volume 35 Issue 3 Pages 96-100
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDynamic compaction of amorphous Fe80P16C4 powder produced by rapid quenching water atomization process was performed using by a gun accelerator. The effect of shock duration time on the magnetic properties has been investigated by means of X-ray diffraction analysis, microhardness test, optical microscopy, scanning electron microscopy and magnetic measurements. The results indicate that the magnetic properties of dynamically compacted amorphous powder are highly affected by shock duration time, and can be described by a change in the atomic short-range order which is caused by shock pressure and temperature.View full abstractDownload PDF (4066K) -
Hiroshi Yamamoto, Mitsuru Nagakura, Kunihiko Hori, Yoshiaki Ozawa1988 Volume 35 Issue 3 Pages 101-105
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSIn melt-supun ribbon of (Pr, Dy)-(Fe, Co)-B system alloys prepared by the single roller method, the effects of composition, substrate surface velocity on the magnetic properties were studied, and their bonded magnets were made of the optimum-quenched ribbons for Pr15Fe77B8, Pr15(Fe0.9Co0.1)77B8, and (Pr0.95Dy0.05)15(Fe0.9Co0.1)77B8 alloys.
Values of a maximum energy product in Pr15Fe77B8, Pr15(Fe0.9Co0.1)7777B8 and (Pr0.95Dy0.05)15(Fe0.9 Co0.1)77B8 ribbons prepared at a substrate surface velocity of 11.8 m/s were obtained 98.3 kJ/m3, 97.4 kJ/m3 and 97.8 kJ/m3 respectively. X-ray diffraction patterns from ribbons show a mixture of an amorphous and a fine crystaline phase.
The best magnetic property obtained for these bonded magnets was (BH)max=64.8 kJ/m3 in Pr15Fe77B8 composition.
It was known that the temperature coefficients of Br and HCB were improved by Co substitution for Fe and Dy for Pr.View full abstractDownload PDF (1414K) -
[in Japanese]1988 Volume 35 Issue 3 Pages 108
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
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Jiro Shibata, Shigenori Tanabe, Masaaki Kuno, Hisanori Akiyama, Tadao ...1988 Volume 35 Issue 3 Pages 109-113
Published: April 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSThe sintering process of Co and diamond mixed powder compact in normal sintering and hot pressing was investigated by dilatometric and microscopic examinations. The density, hardness of sintered compacts and the weight loss of diamond when heated at different temperatures were measured. The results were summarized as follows:
(1) In the case of normal sintering, the shrinkage of Co (1.4μm) powder compact started at 500°C and finished at about 1200°C. On the other hand, Co (3.4μm) powder compact was not completely densified, even under the sintering condition of 1200°C×1hr.
(2) The shrinkage behavior of Co and diamond mixed powder compact was similar to that of Co powder compact. However, a remarkable diffusion layer could not be observed near the interface between Co and diamond, and diamond changed from transparent to black body at 700°C.
(3) In the case of hot pressing, the shrinkage of Co (1.4μm) powder compact started at about 200°C and finished at 900°C, and Co and diamond mixed powder compact was denser than normally sintered compacts.View full abstractDownload PDF (3649K) -
Fuminori Okuzumi, Junichi Matsuda, Ikkei Miyoshi1988 Volume 35 Issue 3 Pages 114-117
Published: April 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSThis study was carried out to provide the diamond film with enhanced adhesion to the cemented carbide substrate by changing coating conditions in EACVD.
Result of a series of experiments reveals that the adhesion of coating to the substrate is mainly related to the pre-treatment of the substrate surface, methane gas concentration and the substrate temperature during deposition.
Pre-treatment by lapping the substrate surface with diamond powder was effective to enhance the adhesion, which imply the lapping promotes nucleation sites of diamond deposition.
The appropriate methane content was 1-1.5%, and the substrate temperature for the best coating was 800-950°C to provide the well adhered coating on the substrate. In addition, the diamond film deposited by above condition was confirmed to consist of pure diamond crystals and adhesion of the film was far better than that of the film consisting of diamond crystals including considerable amount of amorphous carbon.
Performance of the diamond coated tool was tested by dry cutting of an aluminum alloy containing 8%Si. The diamond coated tool was confirmed to last for long time in continuous turning.View full abstractDownload PDF (3122K) -
Akira Fujiki, Yoshihiro Maki, Makoto Kanou, Ichiro Tanimoto1988 Volume 35 Issue 3 Pages 118-124
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe sintering phenomena of mixtures of high speed steel powder and boron containing ferrous alloy powders were studied to obtain carbides and borides precipitated wear resisting P/M alloys. Moreover, the properties of these alloys after heat treatment were also examined. AISI M7 and carbon reduced M7 (0.5%C) powders were selected, and Fe-B and Fe-Cr-B powders were used as additive powder.
The results obtained were summarized as follows:
(1) Fe-B alloy powder was better than Fe-Cr-B powder as the boron containing additive powder.
(2) In order to get good mechanical properties, boron content of mixture was to be determined as (Mo at% +W at%)/B at%=1.0.
(3) Carbon content of H.S.S. should be reduced from standard value to make carbides and borides coprecipitate.View full abstractDownload PDF (6250K) -
Hideaki Itoh, Tsuneaki Matsudaira, Hideki Asano, Katsuya Inoue, Shigeh ...1988 Volume 35 Issue 3 Pages 125-127
Published: April 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSSingle phase sintered compact of c-BN was prepared by high pressure and temperature treatment (7 GPa, 1700°C, 30 min) of the h-BN powder mixed with 30 wt% c-BN powder. An induced transformation from h-BN to c-BN was affected greatly by an ambient pretreatment of mixed powder in a hydrogen and nytrogen stream.
c-BN sintered compact showed homogeneous microstructure composed of directly bonded grains of 0.5-1.0μm in particle size. Density and microhardness of the sintered compact were 3.41 g/cm3 and 5100 kg/mm2, respectively. Dielectric constant of the c-BN compact decreased monotonously with the increase in frequency, and showed a constant value of 10.0 above the frequency of 1 MHz.View full abstractDownload PDF (1208K) -
Hiroshi Hamamoto, Mikio Obayashi, Tsuneaki Matsudaira, Hideaki Itoh, S ...1988 Volume 35 Issue 3 Pages 128-130
Published: April 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSWB and W2B5 powders containing 10 mol% excess amorphous boron, which was compensated by the addition of tungsten powder to keep the respective stoichiometries, were hot-pressed at the treatment con-ditions of 20 MPa and 1900°C for 30 min. The sintered compacts of WB and W2B5 were prepared as single crystalline phases.
Microstructure and sintering behavior of WB sintered compact, which showed a plastic flow type sintering behavior, were greatly different from those of W2B5. Microhardness of WB and W2B5 sintered compacts was 2600 and 2700 kg/mm2, and the transverse strength was 57 and 43 kg/mm2, respectively. Coefficient of linear thermal expansion of WB and W2B5 compacts was 5.3×10-6 and 4.7×10-6 deg-1 at room temperature, and 7.3×10-6 and 6.8×10-6 deg-1 at temperatures above 400°C, respectively.View full abstractDownload PDF (1419K) -
Tsuneyuki Ide, Kazunori Nakano1988 Volume 35 Issue 3 Pages 131-134
Published: April 25, 1988
Released on J-STAGE: July 12, 2010
JOURNAL OPEN ACCESSThe liquid phase sintering of Fe-6wt.%B-48wt.%Mo-(0.01-0.55)wt.%C alloys is studied by means of DTA, dilatometric measurements and microstructural observations. The results can be summarized as follows.
(1) The liquid phase sintering of the alloy is basically accomplished by the formation of two liquid phases produced by L1 and L2 reactions, that is γ-Fe+Fe2B→L1 and γ-Fe+Mo2FeB2→L2, when carbon content in the sintered alloy is very few. As carbon content increases, an another liquid phase reaction, γ-Fe+Fe3C→Lc, adds to L1 and L2, which lies slightly below the temperature range in which L1 reaction occurs. (2) In proportion to the increase of carbon content, the temperature ranges of Lc, L1 and L2 shift to lower temperature. (3) When carbon content is in the range of 0.01-0.55wt.%, the optimum sintering temperature lies slightly above the temperature at which L2 reaction cocurs.View full abstractDownload PDF (1399K) -
[in Japanese]1988 Volume 35 Issue 3 Pages 136
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
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Yuji Katsumura, Masaki Kobayashi, Keiichi Kobori, Hisashi Suzuki1988 Volume 35 Issue 3 Pages 137-141
Published: April 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSThe microstructure, density, transverse-rupture strength (TRS), etc. of Al2O3-SiC ceramics prepared by hot-pressing at 2123 K have been studied. Here, the particle size of two sorts of starting powders, that is, Al2O3 and SiC powders were widely varied in the range of 0.3-3.0μm.
It was found that the strength of Al2O3-SiC ceramics was strongly affected by the microstructural defects acting as fracture sources. It was also found that the Al2O3-(25-30) vol% SiC ceramics, when the required microstructure was obtained by means of a suitable combination of particle size of starting powders, showed a very excellent TRS as high as about 1GPa or more. The strengthening mechanism of Al2O3-SiC ceramics as above mentioned was discussed in detail.View full abstractDownload PDF (4319K) -
MillingEiichi Sentoku, Takahiro Satoh, Yoshio Fujimura1988 Volume 35 Issue 3 Pages 142-146
Published: April 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSMachinable ceramics have low density, excellent oxidation and corrosion resistance compared to other structural materials. These machinable ceramics have to be machined by turning and milling.
The purpose of this paper is to investigate the size of chipping on the corners of works in milling of machinable ceramics. The milling was carried out by single point WC sintered carbide tool. The chipping size on the work material is clarified by the relation between the angles of work corner and disengagement angle in cutting.
The main results obtained are as follows: (1) The wear rate of the tool in milling was nearly twice that of the turning. (2) Chipping sizes on the corners of works were very affected by the disengagement angle and depth of cut. (3) These chipping sizes were estimated from transverse rupture strength of the ceramics and cutting conditions.View full abstractDownload PDF (1367K) -
Keiichi Kobori, Mitsuo Ueki, Tsuyoshi Saito, Hisashi Suzuki1988 Volume 35 Issue 3 Pages 147-150
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSIn recent years, the low-pressure HIP equipments as low as up to about 10 MPa have been developed. The present work was concerned with the effectiveness of low-pressure (≤5 MPa) HIP on the micro-pore elimination for WC-Co alloys having different cobalt contents, carbon contents and carbide grain sizes. The relation between transverse-rupture strength and the sorts of structural defects appearing on the fracture surfaces was studied in detail for both alloys sintered, and subsequently low-pressure HIP-ed. The above relation was also studied for sintered and then commonly high-pressure HIP-ed alloy. It was found that the medium and high carbon alloys with more than about 7%Co were easily HIP-ed even at the pressure of 1 MPa, but for the alloy with low cobalt content (-5%Co), the pressure of about 3 MPa was needed for the perfect elimination of micro-pores.View full abstractDownload PDF (2440K) -
Keiichi Kobori, Mitsuo Ueki, Atsushi Fukawa, Hisashi Suzuki1988 Volume 35 Issue 3 Pages 151-154
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSIn the WC-β-Co alloy system (β; solid solution of WC/TiC ?? 70/30), anomalous phases (called X phases) which have never been reported, were found to form under certain conditions. The present paper describes the forming conditions and properties of X phases in the WC-β-Co alloy specimen. X phases appeared only when the alloy specimen with carbon content so high as to contain free carbon was sintered at low temperatures up to 1380°C. The X phases crystallized during sintering. They were flaky and assumed to be hexagonal phases.View full abstractDownload PDF (4397K) -
[in Japanese]1988 Volume 35 Issue 3 Pages 156
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
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Kohzoh Masuda1988 Volume 35 Issue 3 Pages 157-162
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSIon beam application on solid materials modification are reported. Two effects of ion beam, i.e., introduction of defects and excess atoms, are described with examples of ion implantation to semiconductors, superconductors and new high Tc superconductors.
Ion implantation of oxygen to high Tc superconductors such as YBa2Cu3O7-x, followed by thermal annealing at 900-950°C, was demonstrated to be performed without losing high Tc superconducting characteristics up to a dose of 1×1017/cm2 which adds the amount of about one excess oxygen to YBa2Cu3O7-x.View full abstractDownload PDF (360K) -
Masaya Iwaki1988 Volume 35 Issue 3 Pages 163-166
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSIon implantation into metals is a useful technique for the improvement of wear resistance and corrosion inhibition of metals. In this report, both micro- and macro-characteristics of implanted metals are reviewed. Ti-implantation into steels results in the formation of Fe-Ti-C alloys, which improve the wear and corrosion resistances. N- and B-implantations in steels improving the wear resistance are useful for practical applications. N-implantation into Al produces AIN layers by "Self-Ion Beam Induced Crystallization" process, which plays an improtant role for formation of NbN and TiN. Lastly ion beam mixing is introduced as the related technique to ion implantation.View full abstractDownload PDF (334K) -
Kenzo Kobayashi, Takanobu Fujihana, Yisheng Dai, Takane Kobayashi, Mas ...1988 Volume 35 Issue 3 Pages 167-169
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe 750 Å AINx films were deposited on Si (111), glassy carbon and commercial glass by an activated reactive evaporation (ARE) method in a nitrogen atmosphere. The 80 keV N+-implantation was carried out near room temperature with doses ranging from 5×1016 to 5×1017 N+/cm2 at 1×10-6 torr. The composition of the film before N+-implantation was revealed by the Rutherford backscattering (RBS). The results of an Xray Diffraction (XRD) and a measurement of optical transmittance show the changes on crystallinity and optical transmittance of the AINX (x<1) films due to N+-implantation, depending on doses. It is concluded that N-ion implantation in AINx films results in the formation of c-axis oriented AIN films.View full abstractDownload PDF (1087K) -
Kiyohito Okamura, Mitsuhiko Sato, Tadao Seguchi, Shunichi Kawanishi1988 Volume 35 Issue 3 Pages 170-173
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSPolycarbosilane fibers were irradiated with electron beam in a stream of He gas and the crosslinking between polycarbosilane molecules proceeded with doses, and then the polycarbosilane fibers were cured. The cured polycarbosilane fibers were heat-treated at temperatures of 1200, 1400 and 1500°C and then SiC(E) fibers were prepared. Their tensile strengths were 2.90, 19.2 and 1.49 GPa, respectively. For comparison, thermal oxidation-cured polycarbosilane fibers were heat-treated at temperatures of 1200, 1400 and 1500°C and then SiC(O) fibers were prepared. Their tensile strengths were 2.61, 0.68 GPa and almost null, respectively. The tensile strengths of SiC(O) fibers dropped quickly with the heat treatment temperatures, and those of SiC(E) fibers decreased gradually. On the other hand, electron irradiation-cured polycarbosilane fibers were heat-treated in a stream of NH3 gas and then Si3N4 fibers were prepared. Their fibers were colorless and semi-transparent for visible light. The electron irradiation curing process is considered to be promising in order to prepare SiC fibers with high strength at higher temperature or to prepare new Si3N4 fibers.View full abstractDownload PDF (1169K) -
The Effects of Metal Deposition and Ion IrradiationMasao Kohzaki, Shoji Noda, Haruo Doi, Osami Kamigaito1988 Volume 35 Issue 3 Pages 174-176
Published: April 25, 1988
Released on J-STAGE: December 04, 2009
JOURNAL OPEN ACCESSSiC ceramics, the one deposited with niobium metal film (Nb/SiC) and Ar+ ion-irradiated Nb/SiC were subjected to a pin-on-disk friction and wear test in an ambient atmosphere with a diamond pin for 40 hours. The friction coefficient between SiC and diamond pin was about 0.1. The Nb film deposition reduced the friction coefficient and it was about 0.04 with the normal load of 1000 gf. The wear of SiC was also reduced to one seventh by the Nb deposition. The Ar+ ion-irradiated Nb/SiC was found to have very high wear resistivity and effectively no wear was detected in the samples irradiated to the doses over 5×1015 ions/cm2.View full abstractDownload PDF (201K) -
XPS StudyShoji Noda, Kazuhiko Dohmae, Haruo Doi, Osami Kamigaito1988 Volume 35 Issue 3 Pages 177-179
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSInterface of N+ion-irradiated Zr/SiO2 was examined by the XPS method combined with Ar+ion sputteretching. The ion irradiation was found to form a diffusion layer at the interface and to generate chemical bonds like Zr-Si and Zr-O-Si in the diffusion layer. The diffusion layer was inferred to be an atomically mixed phase of Zr, Si, O, and N atoms rather than a mixed phase of Zr and SiO2.View full abstractDownload PDF (144K) -
[in Japanese]1988 Volume 35 Issue 3 Pages 182
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (101K) -
Masahiro Amemiya, Mikio Kishimoto, Fumitada Hayama1988 Volume 35 Issue 3 Pages 183-188
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe preparation and magnetic properties of cobalt-ferrite epitaxial iron oxides were investigated. The lattice images of the oxides showed that the cobalt-ferrite was epitaxially crystallized on the surface of γ-Fe2O3 particles. The oxides had uniaxial magnetic anisotropy, and the increase of coercivity of the oxides was attributed to the magnetic anisotropy of the coblat-ferrite. The magnetic properties, such as a variation of coercivity in annealing or a printing effect were stable compared with those of cobalt-doped iron oxides. Such stable properties were explained by considering that cobalt ions existed in highly concentrated State on the surface of y-Fe2O3, and the migration of cobalt ions was difficult.View full abstractDownload PDF (3203K) -
Yoshichika Bando1988 Volume 35 Issue 3 Pages 189-193
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSStructures of artificial superlattices of a PbSe-SnSe couple grown on the NaCl (100) by evaporation were investigated by the X-ray diffraction and the cross-sectional transmission electron microscopy. PbSe and SnSe have different crystal structures and a large lattice mismatch. The superlattices, (PbSe)m(SnSe)n adopt four types of lattice structures depending on m and n.
The single crystal films of (CoO)m(NiO)n superlattices were grown on the single crystal α-Al2O3 (0001) by reactive evaporation. The superlattices with the good crystalline quality revealed well-defined satellite X-ray peaks due to an artificial period. A magnetic Bragg peak indexed as (1/2 1/2 1/2) in neutron dif-fraction pattern was observed for superlattices with each layer less than 2 nm (m, n≤8) and a magnetic structure type FCC2 with spin axis lying in the (111) plane grown was suggested. The Néel temperature was found to vary as a linear function of n/(m+n).View full abstractDownload PDF (1313K) -
Hitoshi Dohnomae, Isao Moritani, Noriaki Nakayama, Teruya Shinjo1988 Volume 35 Issue 3 Pages 194-196
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSPeriodic multilayered films composed of 1 Å thick Cr and 50 Å thick Sb layers have been prepared by ultra-high vacuum deposition technique. By sequential deposition at 80°C on a Sb(001) buffer layer prepared on a glass and polyimide substrates, a sulerlattice film in which "mono-layers" of NiAs-type inter-metallic compound CrSb are epitaxially grown between Sb layers has been obtained. This superlattice film shows ferromagnetic behavior at 1.7 K although CrSb is antiferromagnetic in the bulk state; however, the ferromagnetic moment is fairly small, 0.2μB/Cr-atom.View full abstractDownload PDF (208K) -
Hideo Torii, Eiji Fujii, Masaki Aoki1988 Volume 35 Issue 3 Pages 197-201
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThin films of spinel-type iron oxides (Fe3O4-γ-Fe2O3 compounds), α-Fe2O3, and β-Fe2O3 were prepared by plasma assisted chemical vapor deposition from mixed gas containing Fe(C5H7O2)3 and O2 at 250-350°C. The spinel-type oxide films were obtained under conditions of low O2/Fe(C5H7O2)3 mol ratio. But, α-Fe2O3 or β-Fe2O3 films were prepared under high O2/Fe(C5H7O2)3 mol ratio. α-Fe2O3 and β-Fe2O3 were inclined to be formed as single phase at the temperature above and below 300°C, respectively. The spinel-type oxide films tended to be formed as (100) preferred orientated film irrespective of kinds of substrate.View full abstractDownload PDF (393K) -
Eiji Fujii, Hideo Torii, Masaki Aoki1988 Volume 35 Issue 3 Pages 202-204
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThin films of spinel-type iron oxides with (100) orientation were prepared from Ferrocene as a starting material by Plasma assisted CVD. The X-ray diffraction patterns of the films showed that the (100) orientation was dependent on both the flow rate ratio of Ferrocene to Oxygen and the total gas pressure, but independent on Plasma RF power and substrates (Si(111), Si(100), Glass, saphire(012), saphire(001) and Polyimide film).View full abstractDownload PDF (196K) -
Toshihiko Shigematsu, Masaki Narita, Norihiko Nakanishi1988 Volume 35 Issue 3 Pages 205-207
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSZrO2-Y2O3-Fe2O3 solid solution films were produced by a rf-co-sputtering method. The single monoclinic and tetragonal phase appeared for <0.2 mol% and >3.6 mol% (Y2O3+Fe2O3), respectively. On the other hand, the monoclinic and tetragonal mixed phase with the same (Y2O3+Fe2O3) content appeared for 0.2-3.6 mol% (Y2O3+Fe2O3). The single monoclinic and tetragonal phase were stable during the aging at temperature between 673-1473 K in air. In the mixed phase films, the tetragonal phase transformed isothermally to the monoclinic phase without the (Y2O3+Fe2O3) content change during the aging at temperature between 1073-1473 K in air.View full abstractDownload PDF (191K) -
Kazuaki Utsumi, Nobuo Ohde1988 Volume 35 Issue 3 Pages 208-210
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSA designed void-space forming technology for ceramic materials was developed, making use of existing green-sheet and photolithographic techniques.
Ceramic green sheets and patterned polymer films were laminated together; the designed void-space was formed by burning-out and firing this composite green body.
Drop-on-demand ink-jet heads were made from piezoelectric ceramic using this technology. They showed stable ink ejection action.View full abstractDownload PDF (2065K) -
Hisao Suzuki, Hiromitsu Nagata, Yoko Suyama, Hajime Saito1988 Volume 35 Issue 3 Pages 211-214
Published: April 25, 1988
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSMullite precursor is prepared by partial hydrolysis method of metal alkoxides and then mixed with zirconium alkoxide to yield homogeneous and fine mullite-zirconia composite powder with the mean particle size of about 60 nm at 1200°C. Fairly amount of tetragonal zirconia was identified by X-ray diffraction in the temperature range from 1200 to 1700°C because of the combination of the surface energy effect and the constraint of the rigid mullite-matrix.View full abstractDownload PDF (1528K)
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