篠田 豊

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アバター
研究者氏名
篠田 豊
 
シノダ ユタカ
所属
宇部工業高等専門学校
部署
機械工学科
職名
准教授
学位
工学博士(東京工業大学), 工学修士(九州大学)

研究分野

 
 

経歴

 
1996年4月
 - 
1999年12月
科学技術振興事業団 国際共同研究「セラミックス超塑性プロジェクト」 研究員
 
2000年1月
 - 
2000年3月
無機材質研究所 第3研究グループ 新世紀耐熱材料プロジェクト 科学技術特別研究員
 
2000年4月
 - 
2006年3月
東京工業大学 応用セラミックス研究所 構造デザイン研究センター 助手
 
2006年4月
 - 
2016年3月
東京工業大学 応用セラミックス研究所 セキュアマテリアル研究センター 助教
 
2016年4月
 - 
2017年5月
東京工業大学 科学技術創成研究院 フロンティア材料研究所 戦略的イノベーション創造プログラム革新的構造材料研究員
 
2017年6月
 - 
2018年3月
東京工業大学 科学技術創成研究院 フロンティア材料研究所 特任助教
 
2018年4月
 - 
現在
宇部工業高等専門学校 機械工学科 准教授  兼)東京工業大学 科学技術創成研究院 特任准教授 (2018年7月 - )
 

学歴

 
 
 - 
1994年3月
九州大学 工学部 冶金学科
 
1994年4月
 - 
1996年3月
九州大学 総合理工学研究科 構造材料物性工学
 

委員歴

 
2003年4月
 - 
2004年3月
日本セラミックス協会誌編集委員  協会誌編集委員
 
2016年4月
 - 
現在
日本金属学会  欧文誌編集委員会査読委員
 

論文

 
Kimiko Yoshida, Norimasa Nishiyama, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Journal of the European Ceramic Society   37 5113-5117   2017年12月
© 2017 Elsevier Ltd Nanocrystalline SiO 2 stishovite has a fracture toughness higher than 10 MPa m 1/2 due to the toughening mechanism by fracture-induced amorphization. In order to identify other toughening mechanisms which may operate simultaneo...
Takashi Akatsu, Takashi Akatsu, Shingo Numata, Yutaka Shinoda, Fumihiro Wakai
Materials   10    2017年1月
© 2017 by the authors. The effect of the elastic deformation of a point-sharp indenter on the relationship between the indentation load P and penetration depth h (P-h curve) is examined through the numerical analysis of conical indentations simula...
Takashi Akatsu, Takashi Akatsu, Hiroaki Takashima, Yutaka Shinoda, Fumihiro Wakai, Shuichi Wakayama
International Journal of Applied Ceramic Technology   13 653-661   2016年7月
© 2016 The American Ceramic Society Fracture resistance of SiC-whiskers-reinforced Al 2 O 3 -matrix composite under thermal shock was examined. Equibiaxial tensile thermal stress in the composite was significantly reduced before fracture, because ...
Fumihiro Wakai, Kota Katsura, Shun Kanchika, Yutaka Shinoda, Takashi Akatsu, Kazunari Shinagawa
Acta Materialia   109 292-299   2016年5月
© 2016 Acta Materialia Inc. The mechanical principles of viscous sintering were analyzed by finite element simulation of a simple model: the coalescence of two identical spheres. The sintering force in the non-equilibrium process of viscous sinter...
Benjamin Dargatz, Benjamin Dargatz, Jesus Gonzalez-Julian, Martin Bram, Yutaka Shinoda, Fumihiro Wakai, Olivier Guillon
Journal of the European Ceramic Society   36 1221-1232   2016年4月
© 2015 Elsevier Ltd. This second part describes the retention of nanocrystallinity during sintering of ZnO by means of Field-assisted Sintering Technique/Spark-Plasma-Sintering (FAST/SPS), whereas the first part [doi: 10.1016/j.jeurceramsoc.2015.1...
Gaku Okuma, Daiki Kadowaki, Yutaka Shinoda, Takashi Akatsu, Takashi Akatsu, Olivier Guillon, Olivier Guillon, Fumihiro Wakai
Journal of the Ceramic Society of Japan   124 421-425   2016年4月
© 2016 The Ceramic Society of Japan. All rights reserved. The representative volume element (RVE) is a basic concept in the continuum mechanics of sintering of random heterogeneous porous materials. A quantitative determination of its size was per...
Yutaka Shinoda, Rishi Raj, Yusei Minoguchi, Takashi Akatsu, Fumihiro Wakai
Journal of the European Ceramic Society   36 937-942   2016年2月
© 2015 Elsevier Ltd. In this follow up article we report on the residual stresses induced by the phase transition in hafnia grains, in two-phase nanocomposites made with 30 vol% silicon carbide, after cooling down to room temperature from the proc...
Takashi Akatsu, Takashi Akatsu, Shingo Numata, Takamitsu Demura, Yutaka Shinoda, Fumihiro Wakai
Mechanics of Materials   92 1-7   2016年1月
© 2015 Elsevier Ltd. Allrights reserved. In order to evaluate local plasticity, a numerical analysis is carried out on conical nanoindentations simulated with a finite element method. A representative indentation yield stress Y < sup > ∗ < /sup > ...
Kimiko Yoshida, Fumihiro Wakai, Norimasa Nishiyama, Norimasa Nishiyama, Risako Sekine, Yutaka Shinoda, Takashi Akatsu, Takashi Nagoshi, Takashi Nagoshi, Masato Sone
Scientific Reports   5    2015年6月
The development of strong, tough, and damage-tolerant ceramics requires nano/microstructure design to utilize toughening mechanisms operating at different length scales. The toughening mechanisms so far known are effective in micro-scale, then, th...
Yutaka Shinoda, Yoshikazu Suzuki, Katsumi Yoshida
Scripta Materialia   100 51-54   2015年1月
© 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Nanocrystalline SiC ceramics were sintered by spark plasma sintering, with alumina and quartz powders as additives. X-ray diffraction and transmission electron microscopy ...
Takashi Akatsu, Shingo Numata, Takamitsu Demura, Yutaka Shinoda, Fumihiro Wakai
Mechanics of Materials   83 66-71   2015年1月
© 2014 Elsevier Ltd. All rights reserved. The conventional method to extract elastic modulus from the nanoindentation on isotropic linearly elastic solids is based on Sneddon's solution (1965). However, it is known that the solution is valid only ...
Raayaa Wananuruksawong, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Scripta Materialia   103 22-25   2015年1月
© 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Dense nanocrystalline silicon nitride (Si < inf > 3 < /inf > N < inf > 4 < /inf > ) samples were successfully fabricated at extremely low temperature of 1300°C with high p...
Kota Katsura, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Journal of the European Ceramic Society   35    2015年1月
© 2014 Elsevier Ltd. A non-spherical amorphous/glass particle relaxes to its equilibrium shape by viscous flow driven by capillarity at elevated temperatures. The shape evolution of an axisymmetric ellipsoidal particle, which is a model of viscous...
Raayaa Wananuruksawong, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Journal of the American Ceramic Society   98 178-185   2015年1月
© 2014 The American Ceramic Society. Nanograined Si 3 N 4 ceramics with Y 2 O 3 -Al 2 O 3 -MgO as sintering additive exhibited superplastic elongation of > 300% at 1923 K with an initial strain rate of 5 × 10 -4 s -1 . Flow stress was less than...
Methawee Nukunudompanich, Methawee Nukunudompanich, Surawut Chuangchote, Yuji Okamoto, Yutaka Shinoda, Yoshikazu Suzuki, Yoshikazu Suzuki
Journal of the Ceramic Society of Japan   123 428-432   2015年1月
©2015 The Ceramic Society of Japan. All rights reserved. Anodic aluminum oxide (AAO) was used as a template coupled with liquid process for synthesis of TiO 2 nanorods and seminanotubes. Immersion setting (IS) and vacuum drop setting (VDS) were ca...
Yutaka Shinoda, David B. Marshall, Rishi Raj
Journal of the European Ceramic Society   34 1783-1790   2014年7月
Dense nanocomposites constituted from 70/30vol% of hafnia-silicon carbide and were prepared by spark plasma sintering. Silicon carbide suppresses grain growth. The fracture strength of as prepared composites is 400-600MPa. Oxidation up to 1600°C i...
Yingchao Dong, Yingchao Dong, Katsuro Hayashi, Katsuro Hayashi, Hiroki Nozoe, Yutaka Shinoda, Hideo Hosono
Journal of the American Ceramic Society   97 4037-4044   2014年1月
© 2014 The American Ceramic Society. Sr-mayenite (S 12 A 7 ) incorporating Cl - ions in its crystallographic cages up to the theoretical maximum occupancy, Sr 12 Al 14 O 32 Cl 2 , is reported in our study. The addition of a stoichiometric amount o...
Takamasa Onoki, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Journal of the Ceramic Society of Japan   122 570-573   2014年1月
A simple processing route has been developed for a nano-sized crystalline tungsten mono-carbide (WC) and a novel nanostructural carbon materials. Starting materials for WC synthesis were selected tungstic acid (H 2 WO 4 ) and polyacrylonitrile (PA...
T. Akatsu, Y. Yamada, Y. Hoshikawa, T. Onoki, Y. Shinoda, F. Wakai
Materials Science and Engineering C   33 4871-4875   2013年12月
Plasma electrolytic oxidation (PEO)was used tomake a multifunctional porous titaniumoxide (TiO 2 ) coating on a titanium substrate. The key finding of this study is that a highly crystalline TiO 2 coating can be made by performing the PEO in anamm...
Raayaa Wananuruksawong, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
International Journal of Applied Ceramic Technology   10 756-763   2013年9月
Creep behavior of Si 3 N 4 polycrystals containing Y 2 O 3 -MgO-SiO 2 glass phase (with and without Calcium oxide [CaO] additive) was studied by compression tests between 1500 and 1700°C. We studied the effect of CaO additive on flow stress, mic...
T. Akatsu, T. Kato, Y. Shinoda, F. Wakai
Surface and Coatings Technology   223 47-51   2013年5月
A thermal barrier coating (TBC) made of porous ZrO 2 ceramic was formed on a nickel-based single crystal superalloy (NSA) by plasma electrolytic oxidation (PEO). An oxidation barrier coating (OBC) made of Al 2 O 3 based ceramics was created betwee...
Yutaka Shinoda, Yoshikazu Suzuki, Katsumi Yoshida
Journal of Asian Ceramic Societies   1 267-273   2013年1月
Nanocrystalline SiC ceramics was fabricated by spark plasma sintering (SPS) using Al 2 O 3 and TiO 2 additives with the composition of 5, 10 and 20mass% (Al 2 O 3 -TiO 2 ). XRD analysis revealed formation of TiC phase. And also mullite phase wit...
Yoshikazu Suzuki, Tohru S. Suzuki, Yutaka Shinoda, Katsumi Yoshida
Advanced Engineering Materials   14 1134-1138   2012年12月
Porous MgTi 2 O 5 ceramics with pseudobrookite-type structure have been prepared by in situ processing (viz. reactive sintering). In this communication, further studies have been carried out in order to evolve the porous MgTi 2 O 5 , viz., (1) X-r...
K. Madhav Reddy, J. J. Guo, Y. Shinoda, T. Fujita, A. Hirata, J. P. Singh, J. W. McCauley, M. W. Chen, M. W. Chen, M. W. Chen
Nature Communications   3    2012年10月
Ceramics typically have very high hardness, but low toughness and plasticity. Besides intrinsic brittleness associated with rigid covalent or ionic bonds, porosity and interface phases are the foremost characteristics that lead to their failure at...
F. Wakai, Y. Shinoda, T. Akatsu
Journal of the American Ceramic Society   95 2785-2787   2012年9月
A nonspherical glass particle relaxes to its equilibrium shape by viscous flow driven by capillarity at elevated temperatures. The virial method is applied to Stokes equation for studying the viscous sintering of an ellipsoidal particle. The spher...
F. Wakai, H. Fukutome, N. Kobayashi, T. Misaki, Y. Shinoda, T. Akatsu, M. Sone, Y. Higo
Acta Materialia   60 507-516   2012年1月
A method to analyze the mechanics of sintering of a single grain boundary was developed by using specimens fabricated by focused ion beam micro-machining. The translational motion and rotation of particles in sintering are influenced by the grain ...
Yoshikazu Suzuki, Yoshikazu Suzuki, Yutaka Shinoda
Science and Technology of Advanced Materials   12    2011年6月
Magnesium dititanate (MgTi 2 O 5 , MT 2 ) has been synthesized since the early 1930s. It has the pseudobrookite structure (general formula Me 3 O 5 ), corresponding to the Mg-enriched artificial endmember of the Fe 2 TiO 5 (pseudobrookite)- FeTi ...
T. Akatsu, T. Kato, Y. Shinoda, F. Wakai
IOP Conference Series: Materials Science and Engineering   18    2011年1月
We challenge to fabricate a thermal barrier coating (TBC) made of ZrO2 based ceramics on a Ni based single crystal superalloy with plasma electrolytic oxidation (PEO) by incorporating metal species from electrolyte into the coating. The PEO proces...
Fumihiro Wakai, Yutaka Shinoda
Acta Materialia   57(13) 3955-3964   2009年8月
Many sintering bodies shrink in an anisotropic manner when the particle packing is not isotropic. The thermodynamic driving force for the anisotropic shrinkage, i.e. the sintering stress tensor, is determined numerically for an open pore structure...
Yutaka Shinoda, Yuki Yanagisawa, Takashi Akatsu, Fumihiro Wakai, Hidetoshi Fujii
Materials Transactions   50(6) 1250-1254   2009年6月
Fine-grained tungsten carbide copper (WC-Cu) cemented carbide was sintered via spark plasma sintering at 1773 K using a fine WC powder with a mean particle size of 0.11 μm. The mechanical properties were compared with tungsten carbide cobalt (WC-C...
Yutaka Shinoda, Sung Wng Kim, Fumihiro Wakai, Hideo Hosono
Journal of the Physical Society of Japan   77 125-126   2008年12月
Compressive deformation of LaFeAsO 0.9 F 0.1 was examined in a He gas at temperatures 1373 - 1673 K. Extraordinary large deformation (up to true strain of 1.6, the height of the specimen reduced to 1/5 of the original height) was observed at stra...
Kentarou Chihara, Daisuke Hiratsuka, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai, Junichi Tatami, Katsutoshi Komeya
Materials Science and Engineering B: Solid-State Materials for Advanced Technology   148(1-3) 203-206   2008年2月
The deformation of equiaxed dense β-SiAlON polycrystals with an average grain size of 0.83 μm was investigated by compression tests at temperatures ranging from 1823 K to 1973 K. The β-SiAlON ceramics were fabricated from β-SiAlON nano-powder (Si ...
Takuya Tokiyama, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Materials Science and Engineering B: Solid-State Materials for Advanced Technology   148(1-3) 261-264   2008年2月
Fine-grained SiC was hot-pressed with Al, B, and C additives under 150 MPa at 1850 °C. The grains had an equiaxed shape and the average grain size was 360 nm in as-sintered SiC. Al was detected at grain boundaries of Al, B, C-doped SiC by using en...
Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Materials Science and Engineering B: Solid-State Materials for Advanced Technology   148(1-3) 145-148   2008年2月
Nanopowder of tungsten carbide (d < 100 nm) was prepared by the planetary ball milling of the commercial powder with the particle size of the submicron order. The WC powder was densified by the spark plasma sintering. The milled powder was possi...
Michiyuki Yoshida, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Ceramic Transactions   198 85-90   2007年12月
Nanoceramics are experiencing a rapid development in recent years. Nanoceramics exhibit superplasticity at homologous temperatures lower than the deformation temperature of their coarser-grained counterparts, because of the enhanced diffusion. The...
K. Chihara, Y. Shinoda, T. Akatsu, F. Wakai
Materials Science Forum   551-552 597-600   2007年12月
High-strain-rate superplasticity and low-temperature superplasticity are required for making the use of superplastic forming for engineering ceramics even more wide spread. In this study, we developed a Si 3 N 4 -based nanocomposite for the purpo...
M. Yoshida, Y. Shinoda, T. Akatsu, F. Wakai
Key Engineering Materials   317-318 433-436   2006年7月
The deformation behavior of SiO 2 doped nanocrystalline monoclinic zirconia (MZP) was studied at 1323-1223 K in compression tests. The strain rate of SiO 2 doped nanocrystalline MZP was slower than that of high-purity MZP by one order of magnitu...
F. Wakai, Y. Shinoda, T. Akatsu
Key Engineering Materials   317-318 683-688   2006年7月
The sintering stress is related to the thermal stability of porous structure. The sintering stress for a given porous structure in equilibrium can be calculated by three methods theoretically; the energy difference method, the curvature method, an...
E. Narimatsu, Y. Shinoda, T. Akatsu, F. Wakai
Key Engineering Materials   317-318 399-402   2006年7月
In this study, the effect of composition of intergranular glass on superplastic compressee deformation of β -Si 3 N 4 has been studied by compression tests. Oxide additives were used to form Y 2 O 3 -Al 2 O 3 -SiO 2 melt and, with increasing tempe...
Kentarou Chihara, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Key Engineering Materials   317-318 403-406   2006年7月
High-strain-rate superplasticity and low-temperature superplasticity are favorable for making the use of superplastic forming for engineering ceramics even more wide spread. In this study, a silicon nitride based nanocomposite was developed for th...
石原 知, Bill Joachim, Aldinger Fritz, 篠田 豊, 若井 史博, 西村 聡之, 田中 英彦
日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi   114(1330) 575-579   2006年6月
Consolidation of non-crystalline Si-C-N powders has been tried by hot isostatic pressing without sintering additives, in order to fabricate dense non-oxide ceramic monoliths without the crystallization. A polyvinylsilazane polymer was thermally cr...
Fumihiro Wakai, Yutaka Shinoda, Takashi Akatsu
Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques   97 670-675   2006年5月
The transformation of spherical particle assemblies into dense materials by sintering is an idealized micromechanical model for studying the densification. The equilibrium configurations of particle clusters containing canonical Bernal holes, whic...
Fumihiro Wakai, Fumihiro Wakai, Yutaka Shinoda, Takashi Akatsu
International Journal of Materials Research   97 670-675   2006年5月
The transformation of spherical particle assemblies into dense materials by sintering is an idealized micromechanical model for studying the densification. The equilibrium configurations of particle clusters containing canonical Bernal holes, whic...
F. Wakai, T. Akatsu, Y. Shinoda
Acta Materialia   54(3) 793-805   2006年2月
The shrinkage of a closed pore in the sintering of a particle cluster was analyzed. The shrinkage rate was proportional to the sintering stress, and inversely proportional to the macroscopic viscosity. The sintering stress was determined as a func...
E. Narimatsu, Y. Shinoda, T. Akatsu, F. Wakai
Journal of the European Ceramic Society   26(6) 1069-1074   2006年1月
The effect of chemical composition of Y 2 O 3 -Al 2 O 3 -SiO 2 -based intergranular glass on superplastic deformation of β-Si 3 N 4 was studied by compression tests at 1873 K. All hot isostatically pressed Si 3 N 4 materials had essentially the sa...
Satoru Ishihara, Joachim Bill, Fritz Aldinger, Yutaka Shinoda, Fumihiro Wakai, Toshiyuki Nishimura, Hidehiko Tanaka
Journal of the Ceramic Society of Japan   114(1330) 575-579   2006年1月
Consolidation of non-crystalline Si-C-N powders has been tried by hot isostatic pressing without sintering additives, in order to fabricate dense non-oxide ceramic monoliths without the crystallization. A polyvinylsilazane polymer was thermally cr...
Shigehiro Ohtsuka, Shigehiro Ohtsuka, Yutaka Shinoda, Yutaka Shinoda, Takashi Akatsu, Takashi Akatsu, Fumihiro Wakai, Fumihiro Wakai
Journal of the American Ceramic Society   88(6) 1558-1563   2005年6月
The effect of oxygen segregation at grain boundaries on the deformation of 1 wt% boron (B)- and carbon (C)-doped β-silicon carbide (B, C-doped SiC) was investigated by compression testing at 2073 K. We studied the deformation of sinter-forged B, C...
F. Wakai, M. Yoshida, Y. Shinoda, T. Akatsu
Acta Materialia   53(5) 1361-1371   2005年3月
Coarsening during sintering results from surface motion, while grain growth results from grain boundary motion. The sintering of two spherical particles of different sizes, and subsequent coarsening and grain growth, were studied until the smaller...
日吉 英司, 篠田 豊, 赤津 隆, 若井 史博
日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi   112(1312) 661-664   2004年12月
The distribution and the morphology of glass phase in polycrystals are affected by the dihedral angle and the volume fraction of the glass phase. The effects of temperature and chemical composition of intergranular glass on dihedral angle of glass...
F. Wakai, Y. Shinoda, T. Akatsu
Acta Materialia   52(19) 5621-5631   2004年11月
The sintering stress is originally defined for equilibrium states, where the mechanical stress just balances the internal surface tension forces so that the porous material does not shrink. The sintering stress for a given porous structure in equi...
Yutaka Shinoda, Michiyuki Yoshida, Takashi Akatsu, Fumihiro Wakai
Journal of the American Ceramic Society   87 1919-1926   2004年10月
The deformation behavior of boron- and carbon-doped β-silicon carbide (B,C-SiC) with an average grain size of 260 ± 18 nm containing 1 wt% boron was investigated by compression testing at elevated temperatures. Extensive grain growth during deform...
Fumihiro Wakai, Takashi Akatsu, Yutaka Shinoda
Materials Science Forum   447-448 49-54   2004年7月
The extraordinarily large superplastic elongation depends on the ability of fine grains to maintain an equiaxed shape during deformation without fracture. Grain switching is the topological principle of superplasticity. In three dimensions the fac...
Michiyuki Yoshida, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Materials Science Forum   447-448 359-364   2004年7月
The deformation behavior of nanocrystalline monoclinic ZrO 2 (nano MZP) and Y 2 O 3 stabilized tetragonal ZrO 2 (nano Y-TZP) were studied at 1323 K in compression tests. Both nano Y-TZP and nano MZP were "high-purity" materials in which impurit...
Michiyuki Yoshida, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Journal of the American Ceramic Society   87(6) 1122-1125   2004年1月
The deformation behavior of nanocrystalline monoclinic ZrO 2 polycrystals (nanocrystalline MZP) was studied at 1273-1373 K in compression tests. The deformation of nanocrystalline MZP was characterized by stress exponent (n = 2.5), grain-size expo...
Yutaka Shinoda, Michiyuki Yoshida, Takashi Akatsu, Fumihiro Wakai
Journal of the American Ceramic Society   87(8) 1525-1529   2004年1月
The effect of the amount of boron doping in the range of 0 to 1.0 wt% on the high-temperature deformation of fine-grained β-silicon carbide (SiC) was investigated by compression testing. Flow stress at the same grain size increased as the amount o...
Eiji Hiyoshi, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Journal of the Ceramic Society of Japan   112(1312) 661-664   2004年1月
The distribution and the morphology of glass phase in polycrystals are affected by the dihedral angle and the volume fraction of the glass phase. The effects of temperature and chemical composition of intergranular glass on dihedral angle of glass...
Michiyuki Yoshida, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai
Journal of the American Ceramic Society   85 2834-2836   2002年11月
Ultrafine-grained monoclinic ZrO 2 polycrystals (MZP) and 3-mol%-Y 2 O 3 -stabilized tetragonal ZrO 2 polycrystals (3Y-TZP) were obtained by hot isostatic pressing (HIP). Both MZP and TZP were "high-purity" materials with impurities less than 0....
F. Wakai, Y. Shinoda, S. Ishihara, A. Domínguez-Rodríguez
Acta Materialia   50(5) 1177-1186   2002年3月
The maintenance of the equiaxed shape of grains after a large deformation is a common feature of superplasticity in polycrystalline solids. This feature is similar to that seen in the deformation of soap froth. The topological transformation of th...
F. Wakai, Y. Shinoda, S. Ishihara, A. Domínguez-Rodríguez
Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties   81(5) 517-524   2001年5月
Three-dimensional grain growth was analysed using the Surface Evolver program that simulates grain-boundary motion by curvature. When the grain-boundary network reached a statistically self-similar steady state structure in the normal grain growth...
F. Wakai, Y. Shinoda, S. Ishihara, A. Domínguez-Rodríguez
Journal of Materials Research   16 2136-2142   2001年1月
The topological transformation of grains in three-dimensional normal grain growth was analyzed by Brakke's Surface Evolver method that simulated the boundary motion by curvature. The statistics on elemental processes, which change the number of fa...
Hui Gu, Hui Gu, Yutaka Shinoda
Interface Science   8 269-278   2000年8月
Using a hot-isostatic-pressed boron-doped silicon carbide (SiC) material as an example, we demonstrate that the structural width and the chemical width of general boundaries may be quite different. The high-resolution electron microscopy (HREM) ob...
T. Nagano, H. Gu, Y. Shinoda, G. D. Zhan, M. Mitomo, F. Wakai
Materials Science Forum   304-306 507-512   1999年12月
Nano-grain sized β-SiC was prepared with various additives by hot-pressing in Ar. The relative bulk densities were more than 95 %. As-sintered bodies were composed of equiaxed grains. Amorphous phase existed at grain boundaries in each as-sintered...
Y. Shinoda, T. Nagano, H. Gu, F. Wakai
Materials Science Forum   304-306 495-500   1999年12月
The nano-graincd B,C-SiC was fabricated by hot-isostatic-prcssing(HIP) at ultra-high-prcssurc. The average grain size of the SiC was 200 nm and the superplastic elongation over 100% was exhibited in tensile deformation. The high temperature comprc...
Yutaka Shinoda, Takayuki Nagano, Hui Gu, Fumihiro Wakai
Journal of the American Ceramic Society   82(10) 2916-2918   1999年10月
Nanocrystalline silicon carbide that was doped with boron and carbon (B,C-SiC) and contained 1 wt% boron additive and 3.5 wt% free carbon was fabricated using hot isostatic pressing under an ultrahigh pressure of 980 MPa and a temperature of 1600 ...
Hui Gu, Yutaka Shinoda, Fumihiro Wakai
Journal of the American Ceramic Society   82 469-472   1999年2月
Boron segregation to grain boundaries in SiC was directly observed for the first time by using spatially resolved electron energy-loss spectroscopy methods. The hot-pressed, fully dense material was doped with 0.3 wt% of boron and was free of othe...
Yutaka Shinoda, Takayuki Nagano, Fumihiro Wakai
Journal of the American Ceramic Society   82(3) 771-773   1999年1月
Dense nanograined SiC ceramics were obtained by using hot isostatic pressing (HIP). The starting powder was ultrafine β-SiC powder, which had a mean particle size of 30 nm and contained 3.5 wt% free carbon. SiC powders - both boron-doped and undop...

Misc

 
若井 史博, 赤津 隆, 篠田 豊
セラミックス   38(2) 123-128   2003年2月
若井 史博, 赤津 隆, 篠田 豊
Ceramics Japan = セラミックス : bulletin of the Ceramic Society of Japan   49(2) 82-86   2014年2月
篠田 豊, RAJ Rishi, 蓑口 裕正
Ceramics Japan = セラミックス : bulletin of the Ceramic Society of Japan   49(12) 1066-1070   2014年12月
篠田 豊, 若井 史博
塑性と加工   41(470) 183-186   2000年3月
若井 史博, 篠田 豊, 赤津 隆
機械材料・材料加工技術講演会 M&P   21    2013年11月
篠田豊, 若井史博
熱処理   40(1) 5-10   2000年2月
Fumihiro Wakai, Naoki Kondo, Yutaka Shinoda
Current Opinion in Solid State and Materials Science   4(5) 461-465   1999年1月
Ceramics superplasticity has been one of the intensive research fields in the last decade. Although most of the reports are still limited to those of zirconia, new developments have been achieved in superplasticity of Si 3 N 4 and SiC in recent ye...

競争的資金等の研究課題

 
形状記憶ガラス状炭素の粘弾性モデルの構築
日本学術振興会: 科学研究費補助金 基盤(C)
研究期間: 2012年4月 - 2015年3月    代表者: 篠田 豊
Mechanism of superplastic deformation of nanocrystalline silicon carbide ceramics
U.S. Army Research Laboratory: U.S. ARMY ITC-PAC
研究期間: 2009年9月 - 2010年8月    代表者: SHINODA Yutaka