Min Posted May 12, 2021 Report Share Posted May 12, 2021 (edited) There was a recent thread where glaze eutectics was brought up. Stemming from that was a link to an article by Robert Magnuson in the Feb 2018 Ceramics Monthly which contained a link to a eutectic calculator, "EuCal", he created. Magnuson discusses an interesting aspect of eutectics, to quote from the article: "One of the most interesting aspects of eutectics isn’t how they melt, but how they solidify. When a eutectic mixture cools from the molten state, the individual components all stay molten together until they solidify. When they do, a transparent glass is formed. If the molten glaze contains ingredients that are not part of a eutectic, these ingredients may solidify separately while the glass is still liquid, leaving tiny crystals suspended in the glass, producing opacity and other effects in the final glaze. But, if a glaze contains only eutectic mixtures, a transparent glaze will result. Very few glazes are based around a single eutectic and most incorporate both alkali (R2O) and alkaline earth (RO) oxides. Any combination of the eutectics of Na2O, K2O, and CaO (see left) will result in a transparent glaze. For such a neat trick, it’s surprising you don’t hear about it more often. If you have ever tried to formulate a fully transparent glaze by trial and error, you know it isn’t easy to do—unless you know this trick." Since the time of that publication Magnuson has updated and revised his EuCal. Version 1.8 added borate eutectics for the alkali fluxes and the latest version, 1.9, added a calcium borate eutectic. This could be very useful as it now brings mid and low range glazes into play with the calculator. There are some provisions, see the read me file linked below. Given that not everyone has access to the links in the article Jennifer Harnetty asked Magnuson for permission to link the read me file plus the eutectics calculator here to which he very kindly agreed to. I've added the links to the updated version below. I realize this isn't an area that gets a lot of discussion but perhaps as time goes by as more people get familiar with the calculator it can be utilized as a stand alone piece of software or perhaps in tandem with Stull charts. Lots of food for thought here. Link to the Feb 2018 article here: https://ceramicartsnetwork.org/ceramics-monthly/ceramics-monthly-article/Techno-File-Using-Eutectics Link to the User File here: https://ceramicartsnetwork.org/docs/default-source/default-document-library/eucal_1_91_user_guide.pdf?Status=Master&sfvrsn=a5d9b703_5/ EuCal_1_91_User_Guide.pdf Link to the EuCal here:https://ceramicartsnetwork.org/docs/default-source/default-document-library/eucal_ver1_91.xlsm?Status=Master&sfvrsn=6fc99709_9/EuCal_ver1_91.xlsm Edited November 2, 2021 by Jennifer Harnetty updated files Beebop, blackthorn, Pyewackette and 4 others 7 Quote Link to comment Share on other sites More sharing options...
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