Fabrication of Si3N4/SiC Composite Ceramics by Reactive Hot-Pressing from Elemental Powders (特集 ニュ-コンポジット材料) Fabrication of Si_3N_4/SiC Composite Ceramics by Reactive Hot-Pressing from Elemental Powders

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Using elemental powders, reactive hot-pressing was carried out to prepare Si<SUB>3</SUB>N<SUB>4</SUB>/SiC composite ceramics. Silicon and graphite powders with additives (Al<SUB>2</SUB>O<SUB>3</SUB> and Y<SUB>2</SUB>O<SUB>3</SUB>) were reacted at 1873K in gaseous nitrogen (0. 15MPa) and hot-pressed at 2073K for 7.2ks with applied pressure of 70MPa, and finally formed a Si<SUB>3</SUB>N<SUB>4</SUB>(β-Si<SUB>3</SUB>N<SUB>4</SUB>)-SiC(β-SiC) composite with a small amount of glassy and crystalline phases from additives. The resulting composites had 12-34vol%SiC, and the SiC grains were granular with sizes of about 0.1-1μm, and homogeneously distributed and well bonded to the matrix Si<SUB>3</SUB>N<SUB>4</SUB>. On the other hand, the Si<SUB>3</SUB>N<SUB>4</SUB> matrix grains were rod-like in shape with sizes of 0.3-3μm. It was found that the composite ceramics had a relatively higher bending strength at both ambient and elevated (at 1423K) temperatures; about 1000 and 700 MPa, respectively. Fracture toughness of 5.3 MPam<SUP>1/2</SUP> was obtained by indentation fracture tests. It was evident that reactive hot-pressing was very effective process for in-situ synthesis of Si<SUB>3</SUB>N<SUB>4</SUB>/SiC composite ceramics.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(4), 321-325, 1998-04-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002015384
  • 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
    4459414
  • 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  NDL  J-STAGE 
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