Tom at Hutchtel.net on fri 22 jun 07
We're trying to develop a 'no creeping' glaze for cone 10. On it's own, we
want it to stay where it's put. Layered over other glazes, we know it will
move with the glaze beneath it. I'm thinking it might be considered almost
an enamel.
I don't expect formulas, although a starting point would be nice, I'm
thinking that the secret is in the alumina/silica amounts and balance.
Does anyone know of the limit formulas that might lead to such a glaze....we
can work it out in Insight?
Thanks ahead for any help.
Tom Wirt
Hutchinson, MN
twirt@hutchtel.net
www.claycoyote.com
Dannon Rhudy on sat 23 jun 07
Tom, I don't have the formula with me right now,
but do you remember an article Mel did quite some
time ago for CM, had a recipe for a Sung glaze in it?
I have found that that glaze (on any clay so far) is stable
to cone 12, and it takes colorants very well indeed.
I could send you the glaze in a while, when I dig it up,
or you could just ask Mel - it's a simple glaze, too.
Has a slightly chun look to it at 9-10 (just a bit
more reflective) and becomes completely clear at
higher temp. In my experience.........Dannon
> We're trying to develop a 'no creeping' glaze for cone 10. On it's own,
we
> want it to stay where it's put. Layered over other glazes, we know it
will
> move with the glaze beneath it. I'm thinking it might be considered
almost
> an enamel.
>
David Hendley on sun 24 jun 07
Sorry for the typo -- the flint should be 33, not 3.
----- Original Message -----
> #10 Celadon
> Custer feldspar.....27.3
> whiting.....19.7
> kaolin.....20
> flint.....3
> red iron oxide.....1.5
>
> KNa2O .168
> MgO .007
> CaO .825
> Al2O3 .462
> SiO2 3.809
>
David Hendley
Maydelle, Texas
david(at)farmpots(dot)com
http://www.farmpots.com
David Hendley on sun 24 jun 07
Really, a typical, nothing-special-about-it celadon glaze stays
put. If you want a glossy glaze, simply try a few of your
celadon recipes.
Here's the ancient (from the '70's) non-running celadon I still
use:
#10 Celadon
Custer feldspar.....27.3
whiting.....19.7
kaolin.....20
flint.....3
red iron oxide.....1.5
KNa2O .168
MgO .007
CaO .825
Al2O3 .462
SiO2 3.809
Likewise for most tenmoku glazes, which are usually similar to
celadons, but with much more iron added.
David Hendley
Maydelle, Texas
david(at)farmpots(dot)com
http://www.farmpots.com
----- Original Message -----
> We're trying to develop a 'no creeping' glaze for cone 10. On it's own,
> we
> want it to stay where it's put. Layered over other glazes, we know it
> will
> move with the glaze beneath it. I'm thinking it might be considered
> almost
> an enamel.
Ron Roy on sun 24 jun 07
Hi Tom,
I need more info to say - clear? does it have to work with other colours? Opake?
Best to look at the list in Hamer on viscosities - top of the list would be
alumina and magnesia is right up there as well.
At the bottom of the list are the alkalies (KNaO and Li2O) so keep them on
the low side but also keep an eye on the expansion as MgO will lower it.
Anyway let me know more about what you want and I'll make some suggestions.
RR
>We're trying to develop a 'no creeping' glaze for cone 10. On it's own, we
>want it to stay where it's put. Layered over other glazes, we know it will
>move with the glaze beneath it. I'm thinking it might be considered almost
>an enamel.
>
>I don't expect formulas, although a starting point would be nice, I'm
>thinking that the secret is in the alumina/silica amounts and balance.
>
>Does anyone know of the limit formulas that might lead to such a glaze....we
>can work it out in Insight?
>
>Thanks ahead for any help.
>
>Tom Wirt
>Hutchinson, MN
>twirt@hutchtel.net
>www.claycoyote.com
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Craig Martell on sun 24 jun 07
Hello Tom:
I don't know of any strict limits for a "non shifter" but I can give you
the Unity formula for a celedon that I use that really stays put. I left
the iron out of the formula.
CaO 0.70
MgO 0.10
K2O 0.14
Na2O 0.06
Al2O3 0.46
SiO2 3.66
Mol Wt 327.51
Si/Al ratio 8.02/1
LOI 11.53
I use this on porcelain. It might need a small addition of silica if you
use a stoneware clay but maybe not.
regards, Craig Martell Hopewell, Oregon
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