Abstract
Precipitated colloidal silica from geothermal discharge waters of Wairakei, New Zealand was used as the raw material to produce silicon nitride. Mixtures of α and β forms of silicon nitride in the ratio 90/10 to 95/5 were produced by carbothermal reduction and nitridation of this silica in the temperature range 1350 to 1440° C between 2 and 10h. Three other commercial fine-grained silicas were also nitrided under the same conditions. The geothermal silica was found to be as good if not better than any of these silicas.
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Perera, D.S. Conversion of precipitated silica from geothermal water to silicon nitride. J Mater Sci 22, 2411–2415 (1987). https://doi.org/10.1007/BF01082124
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DOI: https://doi.org/10.1007/BF01082124