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FABRICATION OF CERAMICS FROM MOLYBDENUM-CONTAINING POLYSILAZANE

Research Project

Project/Area Number 09650918
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 無機工業化学
Research InstitutionMURORAN INSTITUTE OF TECHNOLOGY

Principal Investigator

SAKAKI Makoto  MURORAN INSTITUTE OF TECHNOLOGY,FACULTY OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (70187128)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsPrecursor / Mo-Si-C-N Ceramics / Heat element / Molybdenum silicide / Silicon carbide / Seebeck coefficient / Electrical conductivity / Thermoelectric material / ゼーベック係数 / 有機高分子前駆体法 / Mo-Si-Cセラミックス / 非晶質 / アンモノリシス / 耐食性 / C / Cコンポジット / コーティング
Research Abstract

Amorphous Mo-Si-C-N ceramics were prepared at 1273 K for 10 h in Ar by heating of polysilazane with molybdenum powder in the composition range from 5 to 30 wt%. By a secondary heat treatment of the Mo-Si-C-N at 1773 K for 2 h in Ar, several composition range of MoSi_2-SiC ceramic composites were obtained. The crystalline sizes of the MoSi_2 and SiC ranged around several tens nanometers. MoSi_2-SiC composites obtained from 5 or 15 wt% Mo-containing polysilazane were semiconductive. However, MoSi_2-SiC composites obtained from 20 or 30 wt%Mo-containing polysilazane showed metallic character. All types of the MoSi_2-SiC composites have n-type carrier measured by Seebeck coefficient. The absolute values of the Seebeck coefficients of the composites increased with increasing MoSi_2 content. Nitrogen content in the composites increased with decreasing MoSi_2 content.. This means that nitrogen in the SiC as a matrix of the composites decreased with increasing MoSi_2 content as a result of the accelerating of reaction sintering. MoSi_2-SiC composites obtained are attractive to use as heat element because of the superior oxidation resistance, lower conductivity coefficient vs. temperature, and smaller crystal-line size. And also the fine-grained MoSi_2-SiC composites are candidate as thermoelectric material evaluated by higher power factor of the electrical properties of the composites.

Report

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

    (10 results)

All Other

All Publications (10 results)

  • [Publications] M.Miyamoto and M.Sasaki: "Electrical Conductivity of MoSi_2-SiC Ceramics Prepared by Reaction Sintering of Polysilazane with Molybdenum Metal" J.Jpn.Powder and Powder Met.45・12. 1162-1165 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 佐々木 眞: "高分子からの機能性セラミックス合成" 工業加熱. 34・5. 65-73 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Sasaki and T.Hirai: "Fabrication of Functionally Graded Materials by Vapor Phase Method" Chapman & Hall. in press.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] MASAYOSHI MIYAMOTO,MAKOTO SASAKI,KEN-ICHI MUKAIDA: "ELECTRICAL CONDUCTIVITY OF MOSI2-SIC CERAMICS PREPARED BY REACTION SINTERING OF POLYSILAZANE WITH MOLYBDENUM METAL" POWDER AND POWDER MET. 45[12]. 1162-1165 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] MAKOTO SASAKI: "POLYMER-DERVED FUNCTIONAL CERAMICS" KOGYOKANETSU. 34. 65-73 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] MAKOTO SASAKI,TOSHIO HIRAI: "FABRICATION OF FUNCTIONALLY GRADED MATERIALS BY VAPOR PHASE METHOD" CHAPMAN & HALL. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Miyamoto and M.Sasaki: "Electrical Conductivity of MoSi_2-SiC Ceramics Prepared by Reaction Sintering of Polysilazane with Molybdenum Metal" J.Jpn.Powder and Powder Met.45・12. 1162-1165. (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐々木 眞: "高分子からの機能性セラミックス合成" 工業加熱. 34・5. 65-73 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Sasaki and T.Hirai: "Fabrication of Functionally Graded Materials by Vapor Phase Method" Chapman & Hall. (in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐々木 眞: "高分子からの機能性セラミックス合成" 工業加熱. 34・5. 65-73 (1997)

    • Related Report
      1997 Annual Research Report

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

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