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RAPID SINTERING OF CERAMIC COMPOSITES BY HIGH TEMPERATURE EXOTHERMIC REACTION/DYNAMIC COMPACTION PROCESS

Research Project

Project/Area Number 06650970
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionFACULTY OF SCIENCE AND TECHNOLOGY,RYUKOKU UNIVERSITY

Principal Investigator

OHYANAGI Manshi  RYUKOKU UNIV./SCI.& TECH./ASSIT.PROF., 理工学部, 講師 (30213888)

Co-Investigator(Kenkyū-buntansha) 小泉 光恵  龍谷大学, 理工学部, 教授 (80029826)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsCOMBUSTION SYNTHESIS / TITANIUM CARBIDE / INTERMETALLICS / COMPOSITE / DYNAMIC COMPACTION / NON-EQUILIBRIUM
Research Abstract

SELF-PROPAGATING HIGH TEMPERATURE SYN-THESIS (SHS) process in which at least one of the reactants is a solid, so-called combustion synthesis, has been gradually received attention from materials scientists. The products of these "solid flames" are technologically important materials such as structural ceramics with high melting temperature, intermetallics and the composites. Solid combustion reaction are generally accompanied by the release of a large amount of heat. In reactions that are sufficiently exothermic, the heat liberated is adequate to sustain the reactions by the rapid propagation of the combustion front without further addition of energy. The process are characterized by a high generated temperature (e.g., 2000 to 4000K), a fast-moving combustion wave front (e.g., 0.1 to 25 cm/sec), and extremely high heating (e.g., 10^4 to 10^6 K/sec) and cooling rates. The advantages of SHS process include high purity of products, low energy and short-time requirements, and relative simp … More licity of the process. SHS products are generally powdery or porous. But the highly dense form can be also fabricated using a combination technique of this process and an external pressure such as hot press, hot isostatic press (HIP), pseudo-HIP (P-HIP), explosive consolidation, and high-velocity forging. The objective of this research is to fabricate ceramics/metal composite, for example, TiC/Ti-Al by a combination technique of SHS for short time process and pseudo isostatic compaction through a sand medium for densification. A SHS heat generated by a Ti-C reaction is very large and the adiabatic combustion temperature reaches to 3210K.But a Ti-Al reaction is weak exothermic and is not easy to initiate without pre-heating the reactant. The reaction maximum temperature was contolled so that the Ti-Al alloy could be molten because a liquid phase is very important to make the composite dense well. The reason why Ti-Al alloy was chosen as a SHS sub-product was that the alloy is hard, light, and has received attention as structural materials in space materials.
A pseudo isostatic compaction (PIC) was applied for densification of the hot and partially molten samples after the SHS.The PIC using sand as the pressure transmitting medium has been developed for the densification of the ceramics/metal composite. This technique should be similar to that developed by Merzharnov et al. An ignition method may be different from Russian SHS researchers. In our PIC apparatus, a sheet of carbon ribbon as the heat device only for ignition is embedded with a sample in commercial casting sand, which is inserted in a pressure vessel. The compaction was performed by quickly pressing the sand containing the sample just after the SHS reaction. A static pressing of PHIP using sand as the pressure transmitting medium is known to cause pseudo isostatic pressing. Herein, the sand-pressing by high speed auto-pressing machine was applied dynamically to perform the PIC after SHS. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] M. Shibuya: "Simultaneous Synthesis and Densification of TiN/Ti-Ni Cmposites by SHS Nitridation" International J. SHS. 5(印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M. Ohyanagi: "Fabrication of Diamond-dispersed Cermets by SHS/Dynamic Isostatic Compaction (DPIC)" International J. SHS. 4. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M. Ohyanagi: "Wave relocity and Kinetics of TiC Combustion Synthesis" Advances in Science and Technology. 3C. 1949-1956 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M. Ohyanagi: "Diamond Embedded TiC/Ti-Al Composite Fabicated by SHS-Pseado Isostatic Compaction" Trans. Mat. Res. Soc. Japan.14A. 685-686 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M. Ohyanagi: "Dense Layer Formed on surface of Cylindrical TiC Combustion Synthesis" International J. SHS. 3. 261-265 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E. A. Levashor: "Regularities of Stracture and Phase Formations of SHS Diamond-Containing Functional Gradient Materials: Operational Characteristics of Articles Based on them" International J. SHS. 3. 287-297 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Shibuya, O.Odawara, M.Ohyanagi, M.Koizumi: "Simultaneous Synthesis and Densification of TiN/Ti-Ni Composites by SHS Nitridation" International J.Self-propagating High Temp.Synthesis. 5 (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Ohyanagi, T.Yoshikawa, T.Yamamoto, M.Koizumi, S.Hosomi, E.A.Levashov, I.P.Borovinskaya: "Fabrication of Diamond-dispersed Cermets by SHS/Dynamic Pseudo Isostatic Compaction (DPIC)" International J.Self-propagating High Temp.Synthesis. 4 (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Ohyanagi, T.Yamamoto, M.Koizumi: "Wave velocity and Kinetics of TiC Combustion Synthesis" Advances in Sciences and Technology. 3C. 1949-1956 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Ohyanagi, T.Yoshikawa, T.Yamamoto, M.Koizumi, S.Hosomi, E.A.Levashov, K.L.Padyukov, I.P.Borovinskaya: "Diamond Embedded TiC/Ti-Al Composite Fabricated by SHS-Pseudo Isostatic Compaction" Trans.Mat.Res.Soc.Japan. 14A. 685-688 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Ohyanagi, M.Shibuya, K.Kobayashi, M.Koizumi: "Dense Layr Formed on Surface of Cylindrical TiC Combustion Synthesis" International J.Self-propagating High Temp.Synthesis. 3. 261-265 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.A.Levashov, B.V.Vijushkov, E.V.Shtanskaya, I.Borovinskaya, M.Ohyanagi, M.Koizumi, S.Hosomi: "Regularities of Structure and Phase Formation of SHS Diamond-Containing Functional Gradient Materials : Operational Characteristics of Articles Based on Them" International J.Self-propagating High Temp.Synthesis. 3. 287-297 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Manshi Ohyanagi: "Diamond Embedded Tic/Ti-Al Composite Fabricated by SHS-Pseudo Isostatic Compaction" Trans. Mat. Res. Soc. Japan. 14A. 685-688 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大柳満之: "燃焼合成" 龍谷理工ジャーナル. 6. 43-51 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] Manshi Ohyanagi: "Wave Velocity and Kinetics of TiC Combustion Synthesis" Advances in Sciences and Technology. 3C. 1949-1956 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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