Eutectics???*&^%$£@***?

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

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the contributors was Tom Buck who gave a straightforward (and, in my case, more understanderble) viewpoint and Gavin Stairs who left me grasping for more brain cells. To quote Gavin . ."the local governing eutectic sets the REmelting temperature of the glaze" not the initial melt. He also says . ."for a 3-phase mixture like Ron's, there are actually more than one eutectic . . .".How does the studio potter apply this to his day to day glazemaking?(Like me, for instance)Thanks in advance (assuming anybody's got the patience to explain it to me who shares my remaining braincell with my dogs.

Reply to
potty
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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

Reply to
Dewitt

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

Reply to
potty

potty wrote in news:aqtk71-0AFEFD.21165230092003 @news.dial.pipex.com:

Go to Digitalfire.com

All you need to know is posted there

JohnW

Reply to
Uncle John

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

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Reply to
ShantiP1

You may find the article that is on my web site, Pottery Techniques/Eutectics & Phase Equilibrium Diagrams.

Web:-

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you do look at it I would be interested to know if you find ithelpful.

David In article , potty writes

Reply to
David Hewitt

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