Microstructure and Mechanical Properties of Sintered Bodies of Fine Powders in Si3N4-TiN System (特集 セラミックスのケミカルプロセッシング) Microstructure and Mechanical Properties of Sintered Bodies of Fine Powders in Si_3N_4-TiN System

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Fine Si<SUB>3</SUB>N<SUB>4</SUB> powder and Si<SUB>3</SUB>N<SUB>4</SUB>-TiN composite powder were prepared by vapor phase reaction method, and hot-pressed to investigate the effects of sintering condition and TiN inclusion on the microstructure and mechanical properties of sintered bodies. The prepared powders were fine with the size below 0.05μm. Hot-pressing was conducted at 1800-1850°C in N<SUB>2</SUB> (1 atm) with 6wt% Y<SUB>2</SUB>O<SUB>3</SUB> and 2wt% Al<SUB>2</SUB>O<SUB>3</SUB> as sintering aid. When fine Si<SUB>3</SUB>N<SUB>4</SUB> powder was sintered at 1800°C, the sintered body had a fine-grained microstructure. By increase in temperature to 1850°C, rod-like grains grew in the fine matrix, resulting in an increase in fracture toughness. Fine TiN particles were dispersed in Si<SUB>3</SUB>N<SUB>4</SUB> matrix by sintering of Si<SUB>3</SUB>N<SUB>4</SUB>-TiN composite powder, indicating the formation of nanocomposite. In the composite system, the growth of rod-like grains was observed even at 1800°C. This suggests the acceleration of Si<SUB>3</SUB>N<SUB>4</SUB> grain growth by TiN inclusion. The composite had a high fracture toughness.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(1), 25-30, 1998-01-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002014854
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4392658
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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