23 Result(s)

Article

Fabrication of c-axis oriented higher manganese silicide by a high-magnetic-field and its thermoelectric properties

We report the preparation and thermoelectric properties of oriented higher manganese silicide (HMS) with a composition of MnSi_1.73 bulk. The grain alignment and densification were achieved by rotating high magnet...

Hisashi Kaga, Yoshiaki Kinemuchi, Koji Watari… in Journal of Materials Research (2007)

Article

Fabrication of c-axis oriented polycrystalline ZnO by using a rotating magnetic field and following sintering

We succeeded in fabricating c-axis (00l) oriented ZnO ceramics by using a rotating magnetic field and a subsequent sintering treatment. The degree of orientation in the green compact was about 0.5 along (00l) on ...

Satoshi Tanaka, Atsushi Makiya, Zenji Kato, Nozomu Uchida… in Journal of Materials Research (2006)

Article

Liquid immersion technique coupled with infrared microscopy for direct observation of internal structure of ceramic powder compact, with alumina as an example

Infrared microscopy was applied to observe the internal structure of alumina powder compact, which was made transparent with an immersion liquid. It provided clear images of nonuniformity in the structure for ...

Keizo Uematsu, Midori Saito in Journal of Materials Research (1999)

Article

Characterization of processing pores and their relevance to the strength in alumina ceramics

Characterization of bulk defects was successfully accomplished in alumina with a transmission optical microscope. The characterization technique used is based on the fact that many ceramics are essentially tra...

Yao Zhang, Mineyuki Inoue, Nozomu Uchida, Keizo Uematsu in Journal of Materials Research (1999)

Article

Binder surface segregation during spray drying of ceramic slurry

Spray-dried granules were observed by a laser microscopy with the immersion liquid technique. The binder distribution in the granules was analyzed from light intensity profiles of the images. The results showe...

Yao Zhang, **ao**a Tang, Nozomu Uchida, Keizo Uematsu in Journal of Materials Research (1998)

Article

Complex beam epitaxy of metal oxide films

 YBa₂Cu₃O₇ films were prepared by the new deposition technique ”complex beam epitaxy”. In this technique, metal-EDTA complexes are evaporated by excimer laser ablation. The metal-EDTA complexes are decomposed by ...

Norio Tanaka, Hirotaka Wakabayashi, Yoshiaki Takata… in Material Research Innovations (1998)

Article

Microstructure design of HIPed TiO₂ ceramics for improved corrosion resistance

Yukio Kishi, Hiromasa Shimojima, Shigeo Ohsio… in Journal of Materials Science Letters (1997)

Article

High strength, electrically conductive pore-free TiO₂ ceramics made by hot isostatic pressing

A high-purity, single-phase TiO₂ ceramic with high density, strength, and electrical conduction was developed as a key structural material for the production equipment of semiconductors. Green bodies were made of...

Yukio Kishi, Katsuhiko Ogura, Kiichiro Kamata… in Journal of Materials Research (1997)

Article

Change of internal/pore structure in alumina green body during initial sintering

A novel characterization method was applied to study the morphological changes of large pores in a ceramic green body during the early stage of densification at 1100°C for 1–64 h. Large processing pores were p...

**-Young Kim, Masayori Miyashita, Nozomu Uchida… in Journal of Materials Science (1992)

Article

Filter cake forming and hot isostatic pressing for TZP-dispersed hydroxyapatite composite

The combination of a filter cake forming process and hot isostatic pressing was applied to prepare hydroxyapatite composites containing dispersed tetragonal zirconia polycrystal (TZP) with high strength and to...

Masaki Takagi, Masahiro Mochida… in Journal of Materials Science: Materials in… (1992)

Article

Effect of Applied Pressure of Hip on the Removal of Processing Void in Alumina Ceramics and the Resultant Improvement of Mechanical Property

Alumina ceramics prepared at various processing conditions were subjected to hot isostatic pressing (HIP) to remove processing-originated voids. Transmission optical microscope was used for characterizing void...

Masayori Miyashita, **-Young Kim, Nozomu Uchida… in MRS Online Proceedings Library (1991)

Article

Direct Evidence on the Elimination of Pore by the Applied Pressure in Hot Isostatic Pressing of Alumina

Removal of natural pore during capsule hot isostatic pressing (HIP) and normal sintering were examined directly with the novel liquid immersion technique, which can reveal details of micro-structure and charac...

Seiki Fukai, Nozomu Uchida, Zenji Kato, Keizo Uematsu in MRS Online Proceedings Library (1991)

Article

Direct observation of internal structure in spray-dried yttria-doped zirconia granule

Spray-dried yttria-doped zirconia granules were made transparent by immersion in a liquid and the internal structure was characterized using an optical microscope. This unique technique was found to be applica...

**-Young Kim, Masahiro Inoue, Zenji Kato, Nozomu Uchida… in Journal of Materials Science (1991)

Article

Hydrogen post-etching effect on CVD diamond film

Nozomu Uchida, Tsutomu Kurita, Keizo Uematsu… in Journal of Materials Science Letters (1990)

Article

Thermochemical etching effect on CVD diamond film in an oxygen atmosphere

Nozomu Uchida, Tsutomu Kurita, Keizo Uematsu… in Journal of Materials Science Letters (1990)

Article

Orientation of ZnO grains by pyroelectric charge-electrical field interaction

Keizo Uematsu, Haruo Morohashi, Tadahiko Morimoto… in Journal of Materials Science Letters (1989)

Article

Effect of additives on the hot pressing of zinc sulphide

Keizo Uematsu, Kazuhiko Sawada, Zenji Kato… in Journal of Materials Science Letters (1988)

Article

Synthesis of aluminium titanate-mullite composite having high thermal shock resistance

Hiroyuki Morishima, Zenji Kato, Keizo Uematsu… in Journal of Materials Science Letters (1987)

Article

Electrical properties of high purity tin dioxide doped with antimony

The electrical conductivity of high purity tin dioxide doped with antimony was studied at temperatures of 900 to 1200° C and partial pressures of oxygen between 10⁻⁸ and 1 atm. For specimens having a dopant conce...

Keizo Uematsu, Nobuyasu Mizutani, Masanori Kato in Journal of Materials Science (1987)

Article

Electrical conductivity of yttria-stabilized zirconia single crystals

The electrical conductivities of YSZ single crystals with various compositions covering FSZ and PSZ regions were measured by a complex impedance method and a four-probe a.c. method. The conductivities changed ...

Sotomitsu Ikeda, Osamu Sakurai, Keizo Uematsu… in Journal of Materials Science (1985)