ナノスケール変態強化を発現する新奇高靭性セラミックスの開発

2017 Fiscal Year Annual Research Report

• Project/Area Number: 15K21768
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: 西山 宣正 東京工業大学, 科学技術創成研究院, 特任准教授
• Project Period (FY): 2016 – 2017
• Keywords: 変態強化 / 破壊誘起アモルファス化 / ペロブスカイト型MgSi03多結晶体 / 変態塑性 / 立方晶窒化ケイ素 / 透明多結晶体 / 超硬質材料

Outline of Annual Research Achievements

本研究ではナノスケール変態強化を発現する新奇セラミックス物質の開発を目的に研究を行った。その結果、2つの大きな研究成果を得ることができた。一つ目は、破壊誘起アモルファス化による変態強化を発現する物質としてペロブスカイト型MgSiO3多結晶体を見出した。この物質はある意味非常にありふれた物質で、地球の深さ670km以深、地球の岩石部分の底(深さ2900km)までの最主要鉱物である。この地球の体積の約8割を占め地球そのものと言ってもいい物質を、一気圧下で構造用セラミックスとして使用すると変態強化、変態塑性を示し、とても割れにくいセラミックスであることを見出した。この成果はとても重要なので、現在も補足データを収集しており万全の状態で論文投稿する予定である。2つ目は、立方晶窒化ケイ素・透明多結晶体の合成に成功した。これは割れにくいセラミックスを創り出すつもりで取り組んだ研究だが、予期せず、全物質の中で3番目に硬く高い透明性を示す物質の合成に成功した。さらにこの物質は他の超硬質材料とは異なる特性も有しており、超硬質材料をこれまでとは違った用途で産業利用する可能性を開く物質になるかもしれない。発表した論文は世界中のメディアで取り上げられた。

Research Products

• [Int'l Joint Research] DESY/キール大学/バイロイト大学(ドイツ)
  • Country Name: GERMANY
  • Counterpart Institution: DESY/キール大学/バイロイト大学
  • # of Other Institutions: 2
• [Int'l Joint Research] 南カリフォルニア大(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: 南カリフォルニア大
• [Int'l Joint Research] 燕山大学(中国)
  • Country Name: CHINA
  • Counterpart Institution: 燕山大学
• [Journal Article] Thermal expansion of coesite determined by synchrotron powder X-raydiffraction (2018)
  • Author(s): Eleonora Kulik, Vadim Murzin, Shogo Kawaguchi, Norimasa Nishiyama, Tomoo Katsura
  • Journal Title: Physics and Chemistry of Minerals Pages: 1-9
  • DOI: 10.1007/s00269-018-0969-7
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Transparent polycrystalline nanoceramics consisting of triclinic A12Si05 kyanite and A1203 corundum (2018)
  • Author(s): Gaida A N, Nishiyama N, Masuno A, Schurmann U, Giehl C, Beermann O, Ohfuji H, Bednarcik J, Kulik E, Holzheid A, Irifune T, Kienle L
  • Journal Title: Journal of American Ceramics Society Volume: 101 Pages: 998-1003
  • DOI: 10.1111/jace.15281
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Evaluation of effects of crack deflection and grain bridging on toughening of nanocrystalline Si02 stishovite (2017)
  • Author(s): Kimiko Yoshida, Nishiyama N, Shinoda Y, Akatsu T, Wakai F
  • Journal Title: Journal of European Ceramics Society Volume: 37 Pages: 5113-5117
  • DOI: 10.1016/j.jeurceramsoc.2017.06.047
  • Peer Reviewed
• [Journal Article] Picosecond amorphization of Si02 stishovite under tension (2017)
  • Author(s): Misawa M, Ryuo E, Yoshida K, Kalia R K, Aiichiro Nakano, Nishiyama N, Shimojo F, Vashishta P, Wakai F
  • Journal Title: Science Advances Volume: 3 Pages: e1602339
  • DOI: 10.1126/sciadv.1602339
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Transparent polycrystalline cubic silicon nitride (2017)
  • Author(s): Nishiyama N, Ishikawa R, Ohfuji H, Marquardt H, Kurnosov A, Bednarcik J, Kulik E, Ikuhara Y, Wakai F, Irifune T
  • Journal Title: Scientific Reports Volume: 7 Pages: 44755
  • DOI: 10.1038/srep44755
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Strength and toughness of nanocrystalline Si02 stishovite toughened by fracture-induced amorphization (2017)
  • Author(s): Yoshida K, Nishiyama N, Sone M, Wakai F
  • Journal Title: Acta Materialia Volume: 124 Pages: 316-324
  • DOI: 10.1016/j.actamat.2016.11.014
  • Peer Reviewed
• [Journal Article] Synthesis of Al203/Si02 nano-nano composite ceramics under high pressure and its inverse Hall-Petch behavior (2017)
  • Author(s): Gaida N A, Nishiyama N, Masuno A, Holzheid A, Ohfuji H, Schurmann U, Szillus C, Kulik E, Bednarcik J, Beermann O, Giehl C, Kienle
  • Journal Title: Journal of American Ceramics Society Volume: 100 Pages: 323-332
  • DOI: 10.1111/jace.14551
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Transparent polycrystalline cubic silicon nitride and its physical properties (2018)
  • Author(s): N. Nishiyama, R. Ishikawa, H. Ohfuji, T. Taniguchi, F. Wakai
  • Organizer: 6th International Symposium on Advanced Ceramics (ISAC-6)
  • Year and Date: 2018-03-00
  • Int'l Joint Research / Invited
• [Presentation] 割れにくいシリカと透明なシリコンナイトライド (2018)
  • Author(s): 西山 宣正
  • Organizer: 第10回ナノ物質集積複合化技術研究会
  • Year and Date: 2018-03-00
  • Invited
• [Presentation] Exploration of super-hard material : laser-shock compression of transparent nanocrystalline high-pressure phases (2017)
  • Author(s): Norimasa Nishiyama
  • Organizer: Mini-workshop on high energy density science with XFELs
  • Year and Date: 2017-12-00
  • Int'l Joint Research / Invited
• [Presentation] Ultra high pressure sintering and synthesis of transparent polycrystalline cubic silicon nitride (2017)
  • Author(s): N. Nishiyama, R. Ishikawa, H. Ohfuji, H. Marquardt, T. Taniguchi, B. Kim, A. Masuno, Y. Ikuhara, F. Wakai, T. Irifune
  • Organizer: International Conference on Sintering 2017
  • Year and Date: 2017-11-00
  • Int'l Joint Research
• [Presentation] スピネル型窒化ケイ素・透明多結晶体の合成とその物性 (2017)
  • Author(s): 西山宣正, 金谷航葵, 若井史博
  • Organizer: 第58回高圧討論会
  • Year and Date: 2017-11-00
• [Presentation] Transformation toughening in silica and transparent polycrystalline cubic silicon nitride (2017)
  • Author(s): Norimasa Nishiyama
  • Organizer: 3rd International Symposium on Metastable Materials Science & Technology
  • Year and Date: 2017-10-00
  • Int'l Joint Research / Invited
• [Presentation] 立方晶窒化ケイ素の透明多結晶体の高温高圧下における焼結 (2017)
  • Author(s): 西山 宣正
  • Organizer: 日本セラミックス協会 第30回秋季シンポジウム
  • Year and Date: 2017-09-00
  • Invited
• [Presentation] A very tough hardest oxide : nanopolycrystalline Si02 stishovite (2017)
  • Author(s): Norimasa Nishiyama
  • Organizer: International Workshop on Giant Straining Process for Advanced Materials (GSAM2017)
  • Year and Date: 2017-09-00
  • Int'l Joint Research / Invited
• [Presentation] スピネル型窒化ケイ素透明多結晶体の合成とその物性 (2017)
  • Author(s): 西山 宣正
  • Organizer: 先進セラミックス第124委員会 第153回会議
  • Year and Date: 2017-09-00
  • Invited
• [Presentation] Transparent polycrystalline silicon nitride with spinel structure (2017)
  • Author(s): Norimasa Nishiyama
  • Organizer: 9th International Symposium on Nitrides (ISNT2017) & 5th International Symposium on SiAIONs and Non-oxides (ISSNOX5)
  • Year and Date: 2017-08-00
  • Int'l Joint Research
• [Presentation] Fabrication of Transparent polycrystalline Spinel-type Silicon Nitride and its Physical Properties (2017)
  • Author(s): Norimasa Nishiyama
  • Organizer: 10th International Conference in the Science and Technology for Advanced Ceramics (STAC-10)
  • Year and Date: 2017-08-00
  • Int'l Joint Research / Invited
• [Presentation] Transparent polycrystalline spinel-type silicon nitride (2017)
  • Author(s): Norimasa Nishiyama, Ryo Ishikawa, Hiroaki Ohfuji, Hauke Marquardt, Takashi Taniguchi, Byung-Nam Kim, Atsunobu Masuno, Takashi Taniguchi, Byung-Nam Kim, Yuichi Ikuhara, FUMIHIRO WAKAI, Tetsuo Irifune
  • Organizer: PACRIM Symposium 19 : Transparent Ceramic Materials and Devices
  • Year and Date: 2017-05-00
  • Int'l Joint Research