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1998 Fiscal Year Final Research Report Summary

Synthesis of carbide-boride composites and their structure control using the solid-state displace ment reaction

Research Project

Project/Area Number 09650727
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionAkita University

Principal Investigator

TAIMATSU Hitoshi  Akita University, Faculty of Engineering and Resource Science, Professor, 工学資源学部, 教授 (60125721)

Co-Investigator(Kenkyū-buntansha) ATSUMI Tarou  Akita University, Faculty of Engineering and Resource Science, Research Associat, 工学資源学部, 助手 (40282157)
Project Period (FY) 1997 – 1998
Keywordscarbides / borides / displacement reaction / titanium carbide / titanium boride / titanium / hard materials
Research Abstract

To synthesize titanium carbide-boride composites by solid-state displacement reaction method, method the reaction mechanism between B_4C and Ti in the solid state was examined at temperatures of 1000 to 1300゚C, In the early stage of the reaction, TiC_X and TiB formed. The TiC_X formed was nonstoichiometric, the composition of which was that in equilibrium with Ti. As the reaction proceeded, TiB_2 began to form with reducing TiB and increasing carbon contents in TiC_X. These results were well explained by the following reaction mechanism : as the first step, the reaction B_4C+(4+l/x)Ti4TiB+1/xTiC_x proceeded, and as the second step, the reaction yB_4C+4TiB+1/xTiC*(2+ 2y)TiB_2+(2+2y)TiC+(2-2y+l/x)Tic_<(y+1)(2-2y+1/x)> followed.
To obtain dense sintered bodies of B_4C and Ti composites, a reactive spark plasma sintering method was applied to densification from B_4C and Ti powders. The most suitable sintering temperature and holding time were first surveyed and determined by measuring their relative densities. Sintered bodies were then examined metallographically and mechanical properties were measured for Young's modulus, Vickers hardness and fracture toughness. When mixtures of B_4C and Ti powders were sintered above 1400゚C, in the early stage TiB, TiB_2, Ti_3B_4 and TiC_X were produced and finally they were entirely transformed into TiB_2 and TiC_X. Composites with relative densities higher than 99 % was obtained at 1800゚C and above. The composites sintered at 1800゚C and below had unique microstructure : TiB_2 phases formed networks surrounding TiC phases. The network structure disappeared at higher temperatures. The composites with relative densities higher than 99 % had mechanical properties of Young's modulus 514 GPa, Poisson's ratio 0.178, Vickers hardness 2090 and fracture toughness 3.8 MPam^<0.5>.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 杉山重彰: "B_4CとTiの反応性放電プラズマ焼結法によるTiB_2-TiC複合体の合成" 粉体および粉末冶金. 45巻. 1065-70 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shigeaki Sugiyama: "Synthesis of a TiB_2-TiC composite by reactive spark plasma sintering of B_4 C and Ti" Journal of the Japan Society of Powder and Powder Metallurgy. Vol.45, No.11. 1065-1070 (1998)

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

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Published: 1999-12-08  

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