Conclusions
The appearance of anomalies on the viscosity curve is due to physical-chemical processes occurring during the firing of refractory clays. By using the viscosity curve for a refractory clay it is possible to determine the temperature at which the neogenes being to appear and complete their appearance. The temperature minimum on the viscosity curve corresponds to the commencement of the appearance of the crystalline neogenes and at the maximum temperature the process is complete.
Refractory clays are inclined to swell. This begins after the anomalies on the viscosity curve.
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Pavlov, V.F. The connection between viscosity and the physical-chemical processes occurring during refiring of refractory clays. Refractories 3, 179–181 (1962). https://doi.org/10.1007/BF01291677
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DOI: https://doi.org/10.1007/BF01291677