I know that eutectics is a complex subject and I'm not looking for any fast answers. June from Shambhala Pottery very kindly pointed me in the right direction when I was querying Si:Al ratios and their relationship to gloss/matt variations and broached the subject of eutectics which, I know, in simple terms concerns the lowest melting temperature of two or more materials. This prompted me to check out Digitalfire's site for more info and I came across a discussion initiated by Ron Roy over the value of understanding eutectics to the making of glazes (see
Eutectics???*&^%$£@***?
I'm pretty sure the vast majority of studio potters completely ignore the issue of eutectics. The Potter's Dictionary by Hamer & Hamer has a good description. It says "Individual potters need not make exhaustive eutectic test. It is sufficient to understand the theory behind eutectic mixtures. . ." It goes on to say that glazes past the eutectics area are "more usable and satisfactory".
deg
thanks for the reply, deg. that's what I was hoping you would say. the problem for me is that I need to find a way of constructing my glazes for a specific firing range, namely cone 9 or around 1280?. any clues when constructing a glaze from scratch with no other recipe to use as a starting point? I'm not expecting a comprehensive solution in one paragraph but in all the reading I've done so far (including Hamer) that's the one aspect I can't get a handle on.
pete
potty wrote in news:aqtk71-0AFEFD.21165230092003 @news.dial.pipex.com:
Go to Digitalfire.com
All you need to know is posted there
JohnW
There are limit formulas for the various temperatures. You might want to do an internet search for glaze limit formulas. The glaze chemistry software like Digital Fire's Insight programs shows the limits. You might check out their web site. There's a lot of information there as well as some glaze recipes. They may even have the glaze limits listed ther. Books like Daniel Rhodes "Clay and Glazes" also has recipes and information on how to create glaze using the molecular formulas. If memory serves me, it also has the limit formulas for cone 9-10 glazes.
Regards, June
You may find the article that is on my web site, Pottery Techniques/Eutectics & Phase Equilibrium Diagrams.
Web:-
David In article , potty writes
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