The Shelfords on wed 26 mar 97
Well now, here's a question. I've just had someone ask me to make something
through which he can weave heating coils, which will heat up the ceramic,
which will then glow as well as radiate heat (fake fireplace coals - that
type of thing. Hey, mine is not to reason why ...) I'm hoping that I can
interest him in some kind of unglazed decorative wall surface which will
also radiate heat, in which case, am I right in thinking that a stone ware
clay, perhaps slightly underfired, will take the constant thermal change
reasonably well? But to make it glow - fairly thin over the heating coils,
perhaps?
But if he persists in wanting something to look like coals - well, I've got
about 6 boxes of that SPS Midnight (or, sorry, Midnite) Black, which will
certainly give him the colour he wants. But I believe that black is created
by a fair amount of manganese in the clay. If that is so (I've yet to have
it confirmed), will the heating and cooling cycle of this kind of use
gradually break down the surface of the ceramic, creating a potentially
toxic dust?
Any relevant experience? Or useful tangents?
Veronica
____________________________________________________________________________
Veronica Shelford
e-mail: shelford@island.net
s-mail: P.O. Box 6-15
Thetis Island, BC V0R 2Y0
Tel: (250) 246-1509
____________________________________________________________________________
Lauren BAll on thu 27 mar 97
The Shelfords wrote:
>
> ----------------------------Original message----------------------------
>, am I right in thinking that a stone ware
> clay, perhaps slightly underfired, will take the constant thermal change
> reasonably well? But to make it glow - fairly thin over the heating coils,
I would recomend a High Alumina clay body with a lot of grof to keep it
open. The refectories used for making crucibles should work fine.
Lauren
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