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Post by mariscal on Nov 1, 2016 1:59:05 GMT -6
Hi , new reduction glaze, ilmenite, rutile, manganese and red iron, reduction 1040º celsius   Jose |
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Kuba
Full Member
SztukKilka in Old Formu
Posts: 111
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Post by Kuba on Nov 1, 2016 9:56:58 GMT -6
Great background and gold color!
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bbucky
New Member
Married
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Post by bbucky on Nov 1, 2016 10:58:01 GMT -6
Beautiful,
Post fire reduction?
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drphil
New Member
Been 9 years since i last threw a pot, moving to Maine building a house and a new studio takes time
Posts: 7
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Post by drphil on Nov 1, 2016 14:59:42 GMT -6
Love it  |
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Post by jerrysawitz on Nov 1, 2016 19:42:23 GMT -6
you set the bar high Jose. beautiful
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Post by mariscal on Nov 2, 2016 0:50:52 GMT -6
Hi thanks guys, I have some problems with this glaze flows, nothing that can not be fixed with a little lithium
bbucky no, reduction and growth at the same time
Jose
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bbucky
New Member
Married
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Post by bbucky on Nov 2, 2016 9:59:24 GMT -6
Jose,
Do you grow crystal first, then reduce at same temp?
Or actually grow crystal in a reduction atmosphere?
Bbucky
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Post by mariscal on Nov 2, 2016 14:37:33 GMT -6
Hi bubcky grow crystal in a reduction atmosphere, not strong reduction but in same time
Jose
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gczop
Full Member
Posts: 202
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Post by gczop on Nov 5, 2016 8:34:21 GMT -6
Lovely Jose.
Do you make any adjustment to the glaze when using manganese and red iron as these are (Mn) or become strong fluxes in reduction.
(Red iron goes to black ferrous iron, a flux, in reduction)
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Post by mariscal on Nov 6, 2016 12:10:37 GMT -6
Lovely Jose. Do you make any adjustment to the glaze when using manganese and red iron as these are (Mn) or become strong fluxes in reduction. (Red iron goes to black ferrous iron, a flux, in reduction) Thanks you I will try it, increase the percentage of manganese Somebody utilized the iron chromate? |
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Post by tileman2 on Nov 7, 2016 11:52:52 GMT -6
Jose:
Although the color and crystals are perfecto: something else caught my eye. In your second picture, I can see the detailing of the inside of your hand reflecting perfectly in the pot. Think you need to add "mirror finish" to your descriptions.
I played with iron chromate a few years back without much success. However, how chemicals react on a flat surface (tile) and a vertical ovoid is not the same. Secondly, I fire to cone 6: which also produces variations in result. Years ago the University of Illinois did a comprehensive tests on flux reactions in a ceramic body. They did note that iron even in small amounts (under 1%) can have dramatic effects on the fluxing in a body. Iron and Calcium react to potassium and sodium: and the added effect is in conjunction with these fluxes. Then in reduction, the fluxing ability is amplified yet again. In reduction: the total amount of iron has to be added into the total fluxes in the body or recipe.
Tom
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Post by mariscal on Nov 7, 2016 13:40:22 GMT -6
Hi Tom, my knowledge of chemistry is very limited
This glaze has 5% fine rutile,fine ilmenite 3%, 2 red iron oxide and 1% manganese dioxido
I think because of rutile and ilmenite is not very fluid, but I have the solution if we hold at higher temperatures flow problems disappear
FIRING SCHEDUL
1280º celsius--10 minutes
1110º celsius---3,30 hours
1050ºcelsius never less---1,30 hours reduction
Jose
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Post by mohawkpiper on Nov 7, 2016 15:26:12 GMT -6
i think because the reduction temps are much lower than the initial melt temps that reducing the materials makes no difference on flow. maybe if reduction happened at peak temps then maybe the glaze would need to be altered for reduction. i also reduce during crystal growing periods with these materials and i make no changes to compensate for flow when i fire my glazes in reductions vs oxidation
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Post by tileman2 on Nov 7, 2016 21:29:30 GMT -6
Amounts of Fe2Os in the order of 0.3 percent are sufficient to lower the viscosity of a feldspar melt and thereby lower its p.c.e. value. The addition of the oxides of Ca, Mg, Ba and Zr in amounts of 2 to 5 percent have also been found to lower the viscosities of feldspars melts and reduce the de-formation temperatures.(28, 30) (U of I)
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Post by mariscal on Nov 8, 2016 6:57:06 GMT -6
Thanks guys, Next week I will do another test,
I will consider your advice
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