The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Effect of the Interaction between Matrix and Nitrate Additives on the Sintering of Silicon Nitride

  • Park, Dae-Chul (Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-Okayama, Meguro-ku) ;
  • Toyohiko Yano (Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-okayama,k Meguro-ku) ;
  • Takayoshi Iseki (Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo)
  • Published : 1999.06.01
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Abstract

The interaction between commercial $Si_3N_4$ powder and two types of additives (nitrate and oxide additives) during the sintering of $Si_3N_4$ was investigated. The nitrates solution or oxide particles were added as a sintering additives. The surface of mixed powder was observed with FT-IR, TG, and HREM. DTA was used to characterize the reactivity of the powders. The formation of crystalline phases and phase transformation were analyzed by XRD. The adsorption of the additives on the surface of silicon nitride was confirmed in the nitrate salts. It was shown that the adsorption occurred by interaction between the amorphous $SiO_2$ layer on the $Si_3N_4$ surface and metal cations $(Al^{3++\; and \;Y^{3+})$ and anions $(NO_3\;^-\; or\; OH^-)$, resulting in a higher degree of homogeneous distribution of additives.

Keywords

References

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