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1999 Fiscal Year Final Research Report Summary

Industrialization of New PTCR Materials Based on a Ceramics Matrix with a Dispersion of Bi Metal Particles as Ceramic Heaters

Research Project

Project/Area Number 09555203
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Structural/Functional materials
Research InstitutionTohoku University

Principal Investigator

OKADA Masuo  Graduate School of Engineering, Tohoku University, Professor, 大学院・工学研究科, 教授 (80133049)

Co-Investigator(Kenkyū-buntansha) UMEHARA Nobuo  Electronics Device Division, TDK Corporation, Technical Manager, 電子デバイス事業本部・技術統括部, 第一技術部課長(研究職)
YODOGAWA Masatada  Electronics Device Division, TDK Corporation, General Manager, 電子デバイス事業本部・技術統括部, 第一技術部副部長(研究職)
KAMEGAWA Atsunori  Graduate School of Engineering, Tohoku University, Research Associate, 大学院・工学研究科, 助手 (90292242)
FUDA Yoshiaki  2nd Research Dept. of R&D Center, Tokin Corporation, Manager, R&Dセンター, 第2研究部担当部長(研究職)
Project Period (FY) 1997 – 1999
Keywordspositive temperature coefficient of resistivity / Bi metal / Ceramics Composites / Ceramic Heater / PTCR thermistor / Hot-Pressing
Research Abstract

A new type of PTCR materials based on a Bi metal/Ceramics composites has been developed. In this study the possibility for industrialization of the material has been investigated.
The composites based on a ceramics matrix with a dispersion of Bi metal particles showed PTCR properties at the melting point of Bi metal of about 270℃. The melting points of temperature were controlled by varying the melting points of Bi alloy particles.
The ceramics matrix such as AlィイD22ィエD2OィイD23ィエD2, SrBiィイD24ィエD2TiィイD24ィエD2OィイD215ィエD2 and TiOィイD22ィエD2 have an effect on magnitude of the PTCR properties and a room-temperature resistivity.
It was found that the sample 0.76Bi-0.24SrBiィイD24ィエD2(TiィイD20.95ィエD2NbィイD20.05ィエD2)ィイD24ィエD2OィイD215ィエD2 sintered by optimum condition (1125℃, 2h) and by decreasing the particle size of Bi metal to a few micron showed the PTCR property of about 5 orders of magnitude.
The relative density of hot-pressed composites with using fine Bi metal reached more than 99% and its resistivity of nearly 10ィイD1-1ィエD1Ωcm at room-temperature unchanged after the cyclic measurement. In addition, the magnitudes of PTCR effect reached 7 order of magnitude, and resistivity-temperature curve also remained unchanged even after 3rd measurements.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] T.Sawaguchi: "New PTC Materials Based on Bi Metal Ceramics Composites"Materials Transactions, JIM. Vol.38,No.4. 353-358 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sawaguchi: "Microstructures and PTCR Properties of Bismuth Metal/Strontium-Bismuth-Titanate Ceramic Composites"Materials Transactions, JIM. Vol.40・No.5. 404-407 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 加納貴志: "ホットプレス法により作製したBi金属/セラミックス複合体のPTCR特性"粉体および粉末治金. 第46巻第7号. 752-756 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sawaguchi: "New PTC Materials Based on Bi Metal Ceramics Composites"Materials Transactions, JIM. Vol. 38, No. 4. 353-358 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sawaguchi: "Microstructures and PTCR Properties of Bismuth Metal/Strontium-Bismuth-Titanate Ceramic Composites"Materials Transactions, JIM. Vol. 40, No. 5. 404-407 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kanou: "PTCR Properties of Bi Metal/Ceramic Composites Fabricated by Hot-Pressing"J. Japan Soc. Powder and Powder Metallurgy. Vol. 46, No. 7. 752-756 (1999)

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

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Published: 2001-10-23  

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