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2003 Fiscal Year Final Research Report Summary

Fabrication and Mechanical Properties of TiB_2-B_4C Composite Ceramics by Spark Plasma Sintering Method

Research Project

Project/Area Number 13650769
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionNagano National College of Technology

Principal Investigator

MORIYAMA Minoru  nagano national College of Technology, Dept. of Electronics & Control Engineering, Professor, 電子制御工学科, 教授 (40141890)

Project Period (FY) 2001 – 2003
KeywordsTiB_2-B_4C composite ceramics / Spark plasma sintering / Mold material / High strength / High fracture toughness / High electrical conductivity / Electrical discharge machining / Additives
Research Abstract

To develop the mold material made of hard ceramics in which the electrical discharge machining (EDM) is possible, the TiB_2-B_4C ceramic composites containing 0 up to 100 mol%B_4C (20mol%steps) were fabricated from a mixture of TiB_2 and B_4C powders by Spark Plasma Sintering(SPS) method that was possible to product efficiently. SPS condition was 1680-1750°C for 720s under a pressure of 40.0 MPa in a vacuum, and the examination of the composite revealed mechanical and electrical properties and EDM characteristics as a function of compositional change from TiB_2 to B_4C. Optimum additive to improve mechanical properties was also investigated for the composite with the content of 40mol%B_4C.
(1)The derived TiB_2-B_4C composite containing 40-60 mol%B_4C with no additives had following high properties. A relative density could be attained more than 96%, Vickers hardness 30 GPa, flexural strength 730 MPa, Young's modulus 450 GPa, fracture toughness (Kic) 5.4 MPa・m^<1/2> or more, respectively. The mean surface roughness (Ra) was below 25 nm, and electrical conductivity in the range of 0.25-1.32 MS・m^<->1.
(2)The composites presented high mechanical properties compared with those for TiB_2 or B_4C single phase, and possesed the comparable properties manufactured by hot-pressing method at 1950°C with the same composition.
(3)The composites were machinable by electric discharge with high-speed using the conditions for steel. Hence, the composite was useful for ceramic mold material. The mechanical properties after processing of EDM were about 70% of those bofore.
(4)AIN was the optimum additive to improve the mechanical properties of TiB_2-B_4C ceramic composite. AINpromoted especially the Kic up to 8.OMPa・m^<1/2>.
By adopting the composite ceramics as mold materials, it is presumed that the long-term life of mold, improvement of heat-resistant and corrosion-resistant are attained.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 櫻井隆幸, 佐藤信悟, 森山 実: "TiB_2-B_4C系複合セラミックスの焼結助剤に関する研究"日本機械学会北陸信越学生会第32回学生員卒業研究発表講演会. 講演論文集. 93-94 (2003)

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      「研究成果報告書概要(和文)」より
  • [Publications] 森山 実, 横山靖樹: "TiB_2-B_4C系複合セラミックスの焼結助剤に関する研究"長野工業高等専門学校紀要. 第37号. 29-35 (2003)

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      「研究成果報告書概要(和文)」より
  • [Publications] 降旗 愛, 森山 実: "ホットプレス法による助剤添加TiB_2-B_4C複合セラミックス焼結体の作製と機械的特性"日本機械学会北陸信越学生会第33回学生員卒業研究発表講演会. 講演論文集(印刷中). (2004)

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      「研究成果報告書概要(和文)」より
  • [Publications] 小林修一, 森山 実: "放電プラズマ焼結(SPS)法によるTiB_2-B_4C系複合セラミックスの放電加工"日本機械学会北陸信越学生会第33回学生員卒業研究発表講演会. 講演論文集(印刷中). (2004)

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      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakurai, S.Sato, M.Moriyama: "Research for sintering aides of TiB_2-B_4C composite ceramics"Proceedings of Hokuriku-Shinetu Branch, Japan Society of Mechanical Engineers. No.32. 93-94 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Moriyama, Y.Yokoyama: "Research for sintering aides of TiB_2-B_4C composite ceramics"Memoirs of Nagano National College of Technology. No. 37. 29-35 (2003)

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      「研究成果報告書概要(欧文)」より
  • [Publications] A.Furihata, M.Moriyama: "Fabrication and mechanical properties of hot-pressed TiB_2-B_4C composite with various additives"Proceedings of Hokuriku-Shinetsu Branch, japan Society of Mechanical Engineers. No. 33(in press). (2004)

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  • [Publications] S.Kobayashi, M.Moriyama: "Electric discharge machining of Spark-plasma-sintered TiB_2-B_C composite ceramics"Proceedings of Hokuriku-Shinetsu Branch, japan Society of Mechanical Engineers. No. 33(in press). (2004)

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      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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