Gelcasting of carbide ceramics(<Feature>SiAlons and Non-oxides)

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In this article, the aqueous gelcasting of carbide ceramics (SiC, TiC, B_4C) was studied systematically. For SiC with the addition of AI_2O_3 and Y_2O_3 as sintering additives, tetramethylammonium hydroxide (TMAH) is used as the dispersant for making slurry with high solids lading and low viscosity. N,N-dimethyl acrylamide (DMAA) and N,N'-methylenebisacrylamide (MBAM) are applied as organic monomers and cross-linker respectively. Ammonium persulfate (APS) acts as initiator for the polymerization of acrylamide monomers. Gelcasted SiC samples are pressureless sintered at 2000℃ with the relative density higher than 97%. The gelcasting of TiC/Ni system are studied with PEI as the dispersant. An azocompound, 2,2'-azobis[2-(imidazolin-2-yl) propane]dihydrochloride(AZIP・2HCl) is selected as the initiator. The green samples with the relative density as high as 57.5% can be densified at 1530℃ in vacuum. The linear shrinkage, relative density, apparent porosity, flexural strength, Young's modulus and Rockwell hardness(HRA) are (15.96 ± 0.65)%, (93.3 ± 0.7)%, (1.03 ± 0.16)%, (1062.77 ± 49.81) MPa, (323.93 ± 4.00)GPa and (84.74 ±0.63)% respectively. PEI is also an effective dispersant for B_4C powder in aqueous media. With the addition of PEI, the solids loading of B_4C slurry higher than 50 vol% can be obtained. The pressureless sintering of B_4C with 10 mass% TiC as sintering additives is performed at 2250℃ for 30 min in Ar atmosphere. The relative density of B_4C sintered samples is around 96.2%. Results showed that gelcasing is an effective processing technique for preparing carbides with complex shape and satisfied properties.

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  • 日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi = Journal of the Ceramic Society of Japan   [巻号一覧]

    日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi = Journal of the Ceramic Society of Japan 116(1354), 694-699, 2008-06-01  [この号の目次]

    公益社団法人日本セラミックス協会

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各種コード

  • NII論文ID(NAID)
    10021033895
  • NII書誌ID(NCID)
    AA12229489
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13486535
  • NDL 記事登録ID
    9557280
  • NDL 雑誌分類
    ZP9(科学技術--化学・化学工業--無機化学・無機化学工業--セラミックス・窯業)
  • NDL 請求記号
    Z78-A504
  • データ提供元
    CJP書誌  NDL  NII-ELS  J-STAGE 
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