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Control of Nano-Phase Separated Structure in Fine Amorphou Composite Partucles

Research Project

Project/Area Number 09450247
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

HOJO Junichi  Kyushu Univ., Fac.Eng., Professor, 工学部, 教授 (20038079)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Michie  Kyushu Univ., Fac.Eng., Research Assistant, 工学部, 教務員
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥13,900,000 (Direct Cost: ¥13,900,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥11,800,000 (Direct Cost: ¥11,800,000)
KeywordsSilicon nitride / Boron nitride / Titanium nitride / Composite particle / Phase separation / Nanocomposite
Research Abstract

(1)Structure of fine composite particles
Fine composite particles were prepared by a vapor phase reaction method : Si_3N_4-BN composite particles in SiCI_4-BCl_3-NH_3-H_2 system and Si_3N_4-TiN composite particles in SiCI4-TiCl4-NH3-H2 system. The particle size was 0.05-0.1mum. The Si_3N_4-BN composite particles were amorphous. It was suggested that Si3N4 and BN were mixed on molecular level. In Si_3N_4-TiN system, TiN crystallites with a size below 10nm were dispersed in amorphous Si_3N_4 particles.
(2)Phase change and crystallization of fine composite particles
The powder compact of fine composite particles was heat-treated at 1200-16000C in N2. The sintering aid of Y_2O_3(6wt%)-Al_2O_3(2wt%) system was used. In Si_3N_4-BN system, although the powder was amorphous even at 1 6000C without sintering aid, beta- Si_3N_4 crystallized at 16000C with sintering aid. IR analysis indicated that Si_3N_4 and BN phases separated with a rise of temperature, and the crystallization was accelerated by sintering aid. It was found from XPS analysis and TEM observation that BN was segregated on the surface of Si_3N_4 particles during phase separation.
In Si3N4-TiN system, TiN stimulated the crystallization of beta- Si_3N_4 with and without sintering aid. XPS analysis suggested that TiN was segregated on the surface of Si_3N_4 particles without sintering aid, whereas TIN particles were surrounded by Si_3N_4 particles with sintering aid.
(3)Mechanical properties of nanocomposites
The nanocomposites of Si_3N_4-BN and Si3N4-TiN systems were fabricated by hot pressing of fine composite particles. Fine BN dispersion improved the thermal shock resistance in Si_3N_4-BN system. The fracture toughness was improved in Si_3N_4-TiN system. It was found that fine TiN dispersion accelerated the growth of beta Si_3N_4 rod-like grains, resulting in the improvement of fracture toughness.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Junichi Hojo: "Microstructure and Mechanical Properties of Sintered Bodies of Fine Powders in Si_3N_<4->TiN System" J.Japan Soc.Powder and Powder Metallurgy. 45・1. 25-30 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Junichi Hojo: "Nanostructural Control of Ceramics by Using Ultrafine Composite Particles" Proc.The Third International Conference on Materials Engineering for Resources. 73-77 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 北條 純一: "複合微粒子によるナノ複合構造と機能制御" 粉体および粉末冶金. 45・12. 1151-1156 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.Hojo, K.Eto, M.Umezu, K.Kishi, S.Umebayashi: "Microstructure and Mechanical Properties of Sintered Bodies of Fine Powders in Si_3N_4-TiN System" J.Japan Soc.Powder and Powder Metallurgy. 45-1. 25-30 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.Hojo: "Nanostructural Control of Ceramics by Using Ultra-fine Composite Particles" Proc.The Third International Confer-ence on Materials Engineering for Resources. 73-77 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.Hojo: "Control of Nanocomposite Structure and Properties Using Fine Composite Particles" J.Japan Soc.Powder and Powder Metallurgy. 45-12. 1151-1156 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Junichi Hojo: "Microstructure and Mechanical Properties of Sintered Bodies of Fine Powders in Si_3N_4-TiN System" J.Japan Soc.Powder and Powder Metallurgy. 45・1. 25-30 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Junichi Hojo: "Nanostructural Control of Ceramics by Using Ultrafine Composite Particles" Proc.The Third International Conference on Materials Engineering for Resources. 73-77 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 北條 純一: "複合微粒子によるナノ複合構造と機能制御" 粉体および粉末冶金. 45・12. 1151-1156 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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