Determination of fluorine in silicon nitride by pyrohydrolysis/ion chromatography.

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  • WATANABE Mitsuyoshi
    Materials Research Laboratory,Corporate R&D Group,NGK Insulators,Ltd.,2-56,Suda-cho,Mizuho-ku,Nagoya 467-8530
  • NARUKAWA Akira
    Materials Research Laboratory,Corporate R&D Group,NGK Insulators,Ltd.,2-56,Suda-cho,Mizuho-ku,Nagoya 467-8530

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Other Title
  • 熱加水分解／イオンクロマトグラフ法による窒化ケイ素原料及び焼結体中のフッ素定量
  • ネツ カスイ ブンカイ イオンクロマトグラフホウ ニ ヨル チッカ ケイソ ゲンリョウ オヨビ ショウケツタイ チュウ ノ フッソ テイリョウ

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Abstract

Fluorine in sintered silicon nitride affects its strength at high temperatures.Fluorine in silicon nitride raw powder and a sintered from were separated as hydrogen fluoride by pyrohydrolysis at 1350°C and absorbed into an alkaline solution.The fluoride ion concentration in the solution was then measured by ion chromatography.Prior to hydrolysis, the sintered silicon nitride was pulverized to below 149μm to secure the complete removal of fluorine during pyrohydrolysis.The proposed method required 3hrs per sample with a detection limit of 1μg Fg-1 and a relative standard deviation of <5% for raw powder and <2% for sintered silicon nitride.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 49 (8), 583-586, 2000

    The Japan Society for Analytical Chemistry

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