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1995 Fiscal Year Final Research Report Summary

Development of Hybrid-Type Ceramic Matrix Composites Based on Fail-Safe Concept

Research Project

Project/Area Number 05302049
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field Composite materials/Physical properties
Research InstitutionThe University of Tokyo

Principal Investigator

KISHI Teruo  Professor, Research Center for Advanced Science and Technology, The University of Tokyo, 先端科学技術研究センター, 教授 (40011085)

Co-Investigator(Kenkyū-buntansha) YOKOBORI Toshimitsu  Asso.Professor, Fac.Engr.Tohoku University, 工学部, 助教授 (00124636)
TAKAHASHI Kiyoshi  Professor, Res.Inst.Appl.Mech., Kyushu University, 応用力学研究所, 教授 (10010795)
HIGO Yakichi  Professor, Inst.Precision Engr., Tokyo Institute for Technology, 精密工学研究所, 教授 (30016802)
ENOKI Manabu  Asso, Professor, RCAST,The University of Tokyo, 先端科学技術研究センター, 助教授 (70201960)
NIIHARA Kouichi  Professor, Inst.Ind.Sci., Osaka University, 産業科学研究所, 教授 (40005939)
Project Period (FY) 1993 – 1995
KeywordsCeramics / Strength / Fracture Toughness / Hybrid-Type Composites / Microstructure / Nano-Size Particles
Research Abstract

Fracture toughness of high-strength ceramics can be improved through the microstructure control and composite reinforcement. Nano-size-particle-dispersed composites are most promising among other candidate materials. The following three types of alumina based hybrid-type nano-composites were investigated through this study, in order to demonstrate the fundamental mechanism of nano-size intragranular dispersion and the contollability of the micructure by intergranular dispersion.
(1) Al_2O_3/5vol% Nano-Size SiC Dispersed Composites : Although very small SiC particles tended to exist within alumina grains, larger ones are dispersed at grain boundaries. The dispersion process of nano-size particles was closely related with the degree of alumina matrix densification. The grain size of alumina could be contolled by carefully selecting the size of reinforcing particles.Both strength and toughness were improved through nano-size particle dispesion.
(2) Al_2O_3/SiC/YAG Hybrid Composites : Micron-size YAG and nano-size SiC particles were successfully dispersed to fabricate Al_2O_3/SiC/YAG Hybrid Composites. Since the grain growth of alumina was controlled and homogeneous microstrucure was accomplished, the mechanical properties were much improved through hybritization.
(2) Al_2O_3/LaAl_<11>O_<18> Composites : Alumina matrix composites with elongated fiber-like reinforcing phases were sucessfully fabricated. Both strength and fracture toughness increased as the volume fraction increased. In particular, the fracture toughness was much improved through the increase in the aspect ratio of reinforcement. Bridging and crack deflection contributed the toughness improvement to a large extent.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 横堀寿光: "短繊維強化高分子複合材料の疲労損傷形態と破壊過程" 日本材料強度学会誌. 29. 113-120 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K Honda: "Analysis of Shear Stress Distribution in Pushout Process of Fiber-Reinforced Ceramics" Acta Metal Mater. 43. 1477-1487 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 蔭山健介: "セラミックス粒子分散ガラス基複合材料における第二層粒子による微視破壊過程の変化" 日本金属学会誌. 59. 140-144 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Hirano: "Microstructure and Mechanical Propertiesot Si_3N_4/SiC Composites" Materials Letters. 22. 249-254 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Takeda: "Micro-Peformation and Damage Analysis of CFRP Laminates by Micro-Grid Mehods" Rroc.4th Japan.Lnt.SAMPE symp.SAMPE Japan. 921-926 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 榎学: "AEによる粒子分散ガラス基複合材料の微視破壊評価" 第10回アコースティック.エミッション総合コンファレンス論文集. 219-224 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Hirano and K.Niihara: "Microstructure and Mechanical Properties of Si_3N_4/SiC Composites" Materials Letters. 22. 249-254 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hirano, T.Kusunose, K.Niihara and T.Ohji: "High Temperature Creep Behavior of Nano-Size SiC Particulate Dispersed Si_3N_4 Nanocomposites" Proc.4th Japan Int.SAMPE Symp.380-385 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Honda and Y.Kagawa: "Analysis of Shear Stress Distribution in Pushout Process of Fiber-Reinforced Ceramics" Acta Metall.Mater.43 (4). 1477-1487 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kosaka, N.Takeda and C.Miyasaka: "Performance Simulation of High-Resolution Scanning Acoustic Microscopy for Transverse Crack Detection in CFRP Laminates" Composites '95 : Recent Advances in Japan and the United States, JSCM,Tokyo. 311-318 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Takeda, H.Niizuma and S.Ogihara: "Micro-Deformation and Damage Analysis of CFRP Laminates by Micro-Grid Methods" Proc.4th Japan Int.SAMPE Symp., SAMPE Japan, Tokyo. 921-926 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kageyama, M.Enoki and T.Kishi: "Mechanical Properties of Alumina Particulate and Platelet--Reinforced Glass Composites with a Crystalline Phase at the Interface" J.Ceram.Soc.Japan. 103 (3). 205-210 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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