Preparatio of Nanosized Si3N4-Y2O3 Powders by Sol-Gel Processing

Abstract

Abstract: Nanosized silicon nitride powders were synthesized by using silica sol, urea, and carbon black with the process of sol-gel and carbothermal reduction. Ammonolysis of the aqueous
solution of silica sol and urea resulted in the formation of an ammono precursor. The effect of ammono precursor and silica sol on the synthesis of Si₃N₄ powders was investigated. The
results showed that using ammono precursor dehydrated can accelerate the reaction rate and increase the nitrogen content of Si₃N₄ powders. Synthesis of nanosized Si₃N₄-Y₂O₃ composite
powders from the homogeneous mixture of Y(NO₃)₃ and silica sol in the liquid state was also studied.

Key words: silicon nitride, ammonolysis, sol-gel, powder preparation, yttrium oxide

GAO Jiming,XIAO Hanning,LIU Dongming,DU Haiqing. Preparatio of Nanosized Si₃N₄-Y₂O₃ Powders by Sol-Gel Processing[J]. Journal of Inorganic Materials.

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Preparatio of Nanosized Si₃N₄-Y₂O₃ Powders by Sol-Gel Processing

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