Surface oxidation to improve water-based gelcasting of silicon nitride

During the process of water-based gelcasting of Si3N4, the gasdischarged due to the reactions on the solid-liquid interface canlead to a great deal of big bubbles in the green bodies. To improvethe process a type of method based on surface oxidation is developed.By means of the method a layer of SiO...

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Bibliographic Details
Published in:Journal of materials science 2000-07, Vol.35 (14), p.3519-3524
Main Authors: Huang, Yong, Ma, Liguo, Tang, Qiang, Yang, Jinlong, Xie, Zhipeng, Xu, Xingli
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Gelcasting
Liquid-solid interfaces
Materials science
Oxidation
Silicon dioxide
Silicon nitride
Sintering (powder metallurgy)
Structural ceramics
Technical ceramics
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Summary:During the process of water-based gelcasting of Si3N4, the gasdischarged due to the reactions on the solid-liquid interface canlead to a great deal of big bubbles in the green bodies. To improvethe process a type of method based on surface oxidation is developed.By means of the method a layer of SiO2 and Si2N2O, which can prohibitthe gas from being discharged effectively, is formed on the surfaceof Si3N4 powders. Oxidized powders can be dispersed better than those not oxidized, and after gas-pressure-sintering mechanical property of the gelcast samples made from the oxidized powder is much better thanthat of dry-pressed and then isostatic pressed samples.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1004897026241