Abstract
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.
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Huang, Y., Ma, L., Tang, Q. et al. Surface oxidation to improve water-based gelcasting of silicon nitride. Journal of Materials Science 35, 3519–3524 (2000). https://doi.org/10.1023/A:1004897026241
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DOI: https://doi.org/10.1023/A:1004897026241