琺瑯釉の熔融における弗素の逃散

概要

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Considering the trend of the frit composition of today towards softer, selected three ground glasses (Fig. 1) and added tenth of sodium fluoride and sodium silicofluoride respectively. By means of the heat balance, it was known the carbonic acid gas exhausting reaction in fluorine containing batches begins at about 120°C lower and ends at about 80°C lower temperature than that of fluorineless batches. The difference of effect was scarcely found between two fluorides.100g batch of each was smelted in platinum basin, weight loss measured, chemically analysed from which escaping forms were deduced as just melted down and melted on as long as three hours. While in the former fluorine loss was attsibuted to NaF and F2 (conveniently represents fluorine loss which accompanies no cation) for the most, SiF4 for only one case, in the latter in no case to SiF4.In smelting of moderne type of titanium frit on plant scale, fluorine loss amounts to 15-20% and its increase with smelting period was relatively small reversely to the above mentioned results.
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