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Does adding boron alone always increase glaze melt?

Boron (B2O3) is like silica, but it is also a flux. Frits and Gerstley Borate supply it to glazes. In this test, I increased the amount of boron from 0.33 to 0.40 (using the chemistry tools in my insight-live.com account). I was sure that this would make the glaze melt more and have less of a tendency to craze. But as these GBMF test balls for melt flow show, that did not happen. Why? I am guessing that, to get the effect, B2O3 has to be substituted, mole for mole, for SiO2 (not just added to the glaze).

Does adding boron alone always increase glaze melt?

Related Pictures

Click here for case-studies of Insight-Live fixing problems


Insight-live help button

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You will see examples of replacing unavailable materials (especially frits), fixing various issues (e.g. running, crazing, settling), making them melt more, adjusting matteness, etc. Insight-Live has an extensive help system (the round blue icon on the left) that also deals with fixing real-world problems and understanding glazes and clay bodies.

Glaze melt fluidity balls reveal much ...

More about the chemistry than the recipe


Three glaze balls melting down into a pool

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Melting ten-gram GBMF test balls like this is a great way to compare the melting of glazes and materials (e.g. frits, feldspars). This is a good example. The differences in the degree and character of the melting are better explained by the chemistry than by the recipes. Compare the yellow and blue numbers in the unity formulas. The obvious is that glazes 2 and 3 have much more B2O3 (boron, the key flux for cone 6 glazes) and lower SiO2 (silica; it is refractory). But knowing the recipe is also valuable. Notice that glazes 2 and 3 have the same chemistry, but 3 melts better because of the mineralogy of Gerstley Borate. It releases its boron earlier in the firing, getting the melting started sooner. Notice it also stains the glaze amber; it is not as clean as the frit. Not to be ignored is how the calculated thermal expansions are impacted: The greater melting of #2 and #3 comes at a cost: More likelihood of crazing. Which of these is likely best for functional ware? #1, G2926B (left). Its high SiO2 and more modest B2O3 content likely make it more durable. And does not craze.

Links

Oxides B2O3 - Boric Oxide
Glossary Limit Formula
A way of establishing guideline for each oxide in the chemistry for different ceramic glaze types. Understanding the roles of each oxide and the limits of this approach are a key to effectively using these guidelines.

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