Jeff Campana on thu 25 jan 01
Hi.
For those of you who don't know me, I'm Jeff. I Am an undergrad at University of
Wisconsin-whitewater. This semester I am attempting to collaborate with a glass
blower. We want to make some ceramic forms with holes, then blow a glass bubble
into the inside of the vessel, filling in the holes with glass. I know the glass
thermal expansion rate is 96 x10^-7. and after running my clay body through the
glaze calculator, it is only 58. My question goes out to all the glaze gurus out
there:
First of all, has anyone out there ever tried this? My first approach Is to add a
lot of sodium, because According to Rhodes, it has the highest expansion rate, but
that is only 4.32. I wonder if Rhodes was off on this chart? My understanding is
that thermal expansion works by averaging the specific expansions of each oxide,
thus yeilding the body expansion rate. Is this correct? If so, is it even
possible to get a cone 10 body with anywhere close to 96?
I would like to add that I really want to figure this out myself, but need a
little guidance. Is there a book with a good chart? is my current train of
thought off?
thanks in advance to anyone willing/able to help me.
Jeff Campana
Jeff Lawrence on sat 27 jan 01
Jeff Campana was wondering about compatible coe's between clay and glass:
Hi Jeff,
About 4-5 years ago the rage in the lighting market was "bound glass" --
basket-like frameworks of metal with glass bubbles blown into them so that
the glass bulged out the gaps in the frame. After cooling, there was some
play between frame and glass with no harm done -- the undercuts kept the
glass in place. Ask at a local lighting showroom if you want to see
examples -- it still is around, I think.
With clay I'd watch out for thermal shock problems unless you get the clay
pretty hot before blowing the glass into it. Metal workers have it so
easy...
Jeff Lawrence ph. 505-753-5913
18496 US HWY 84/285 fx. 505-753-8074
Espanola, NM 87532 jml@cybermesa.com
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