Louis H.. Katz on sun 27 jun 99
Hi Nikhom,
Marble made of Calcium Carbonate Magnesium Carbonate some silica (I think)
shouldn't start to decompose until 1500 degrees F. This doesn't mean it won't
crack.
I have fired soapstone to around 022 to change its color. Some soapstones work,
others fracture.
Louis
Louis H.. Katz on sun 27 jun 99
Hi Nikhom,
Marble made of Calcium Carbonate Magnesium Carbonate some silica (I think)
shouldn't start to decompose until 1500 degrees F. This doesn't mean it won't
crack.
I have fired soapstone to around 022 to change its color. Some soapstones work,
others fracture.
Louis
Paul Lewing on sun 27 jun 99
nikom chimnok wrote:
>
> ----------------------------Original message----------------------------
> Hello all,
>
> A customer yesterday brought me three materials that he wants
> overglaze decals stuck to.
>
> First is marble. He claims to have seen a piece from the USA that
> was sucessful. How would you fire marble? What are its thermal shock
> characteristics?
>
> Second is concrete--an 8X8 tile about 1 cm thick. Unlike the marble,
> it's quite porous, and I don't even know if the decal can be attached. And I
> feel almost certain the concrete will crack in firing. It's composition, by
> the way, is 3 parts river sand and 1 part white cement. The sand is quite
> refractory--no problem there.
>
> Third is an unglazed terra cotta tile. It's not nearly vitrified.
> I'm sure I can refire it, but what's likely to happen to the overglaze?
Nikom,
I've fired china paints onto unglazed terra cotta tiles, and that's what
commercial decals are, essentially. It works fine, except that the
decals will not be quite as glossy as they would be on a glazed surface.
As for the other two- NO WAY! Don't even think about it!
The concrete would, I would expect, not crack- it would violently
explode. And if the marble didn't explode, I doubt that it would be
structurally sound after it was fired.
Good luck,
Paul Lewing, Seattle, where it was fifty degres and rainy for months.
Things are better now- it's sixty degrees and rainy.
Paul Lewing on sun 27 jun 99
nikom chimnok wrote:
>
> ----------------------------Original message----------------------------
> Hello all,
>
> A customer yesterday brought me three materials that he wants
> overglaze decals stuck to.
>
> First is marble. He claims to have seen a piece from the USA that
> was sucessful. How would you fire marble? What are its thermal shock
> characteristics?
>
> Second is concrete--an 8X8 tile about 1 cm thick. Unlike the marble,
> it's quite porous, and I don't even know if the decal can be attached. And I
> feel almost certain the concrete will crack in firing. It's composition, by
> the way, is 3 parts river sand and 1 part white cement. The sand is quite
> refractory--no problem there.
>
> Third is an unglazed terra cotta tile. It's not nearly vitrified.
> I'm sure I can refire it, but what's likely to happen to the overglaze?
Nikom,
I've fired china paints onto unglazed terra cotta tiles, and that's what
commercial decals are, essentially. It works fine, except that the
decals will not be quite as glossy as they would be on a glazed surface.
As for the other two- NO WAY! Don't even think about it!
The concrete would, I would expect, not crack- it would violently
explode. And if the marble didn't explode, I doubt that it would be
structurally sound after it was fired.
Good luck,
Paul Lewing, Seattle, where it was fifty degres and rainy for months.
Things are better now- it's sixty degrees and rainy.
| |
|
