christie lucero on fri 26 dec 03
I've just done some test tiles using a lithium glaze:
Adrian Arleo's stoney lithium ^06
Lithium carbonate 15.6
EPK 22.
Flint 45.
bentonite 3.7
Frit 3110 13.7
I had seen lithium glazes described as "dry" glazes but assumed that =
referred to the appearance of the end result and mixed the actual glaze =
to roughly the consistancy of cream and dipped each tile three times. =
The results, while interesting, sort of, were not what I expected. I had =
hoped for some dimensionality, i dunno, cragginess like some pix I'd =
seen. Mine lay there like a lox. Oxides were near invisable, need an =
opacifier or over white slip.. But...I can see this surface, whicjh is a =
little like 400 grit sandpaper, could do very well on sculpture. This =
is more musing than a question.=20
You can chew up an awful lot of time testing glazes........
Christie Lucero
snowlion fine Arts
Coyote Creek, NM
Mert & Holly Kilpatrick on sat 27 dec 03
Christy,
If you are looking for dimensionality, texture, etc., you might enjoy
experimenting with the materials Brian Gartside illustrates on his three
colorful interesting posters. Each tile lists the materials used, and he's
NOT limited to functional glazes.
http://www.gartside.info/posterimages.htm
Holly
East Bangor, PA
----- Original Message -----
From: "christie lucero"
>...... The results, while interesting, sort of, were not what I
expected. I had hoped for some dimensionality, i dunno, cragginess >like
some pix I'd seen. Mine lay there like a lox. Oxides were near invisable,
need an opacifier or over white slip.. But...I can see >this surface, whicjh
is a little like 400 grit sandpaper, could do very well on sculpture. This
is more musing than a question.
>You can chew up an awful lot of time testing glazes........
piedpotterhamelin@COMCAST.NET on sat 27 dec 03
Lithium is affected by quantity and cooling time.
If your carbonate is chrystalizing the surface too much to your liking then reduce the amount by half and see what you get. Surface texturing in this glaze range, in my experience, occurs in amounts above 2-4%.By the way, not all lithium carb is equal. You possibly purchased a coarse lithium instead of a fine lithium or visa versa.Some suppliers only sell one type, others both. I learned the hard way.
Slooooowwwwww
cooling increases the dry surface, crash cooling to red heat can prevent the matting. Again, firing and cooling rates, glaze thickness etc have there affects. Your kiln and glaze application are a component of the recipe.
Peace
Rick
--
"Many a wiser men than I hath
gone to pot." 1649
iandol on sun 28 dec 03
Dear Christie Lucero ,
Although Lithium Carbonate has a very low melting point, slightly over =
700=BA C and there is a moderate amount of frit in your glaze sample =
which will also melt at an early stage in your firing it is questionable =
whether or not the remainder of the refractory materials, the Clays and =
the Silica will all dissolve into the melt. I think it has been pointed =
out that this is essential if a glaze is to be considered durable.
I have been researching the notion of Foam Ceramics and there is an =
interesting Patent which describes the use of a high silicate, high =
boron melt which cools to become a two phase solid. One phase is water =
soluble and when it has dissolved the residue is a porous silicate =
material.
Now I am not saying this will happen to the glazes used by a potter. but =
it is something to bear in mind when researching glazes in a practical =
sort of way.
Best regards,
Ivor Lewis. Redhill, South Australia
| |
|
