|Monthly Tech-Tip |
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Many come to Insight-live after "Glazy recipe fails". A better way is to recognize the potential in a recipe, fix it by material logic and calculation (e.g. limit recipes), then and try it. Glazy "Red Orange #111576" is a good example. It has two things I avoid: Lithium (expense) and a high percentage of red iron (slurry gelling). It is easy to fix both. Spodumene is a better source of Li2O but it contributes lots of Al2O3 and SiO2. We can "make room" for it by replacing the feldspar with frit 3110 (the latter contributes much more sodium and much less Al2O3/SiO2 than the feldspar). Second, use black iron instead of red. The results using the C6IRED schedule are fabulous. And the cost is way down. Amazingly black iron does not gel the slurry at all! And it is not nearly as messy as the red. Like any iron red, this has a fluid melt so is running (although it is applied thickly). The thermal expansion is still quite low so it should not craze. And the LOI is much lower, that should minimize bubbling.