ginny bivaletz on sun 23 apr 00
i have now done 3 glaze firings in our 20 cubic foot
car kiln. in the first firing i used three kiln
shelves that had been previously used in a salt
kiln.(ouch - i didn't know). a few bricks on the door
and near one burner had some chunks fall out and get
sort of crumbly. i am assuming that came from using
the salt impregnated shelves. ( these shelves had kiln
wash on very thick and the ware that was fired on them
had quite a nice look to it.)
i tried patching the spots with itc patch and after
the next firing the patch came loose. i thought maybe
if i scraped out the damaged brick and patched again
it might work. i used a wooden tool to scrape out any
crumbly brick and patch that remained,applying new
patch as thick as 1/4 ". after this last firing hunks
of patch are still coming off and i am afraid one of
them will land on something in the kiln.
can anyone help me with this> thanks
ginnyB on orcas island in the drizzle.
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ferenc jakab on mon 24 apr 00
> patch as thick as 1/4 ". after this last firing hunks
> of patch are still coming off and i am afraid one of
> them will land on something in the kiln.
> can anyone help me with this> thanks
> ginnyB on orcas island in the drizzle.
>
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> Send online invitations with Yahoo! Invites.
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Ginny,
If your kiln is built with the traditional brick laying method, i.e.
alternating the vertical join from row to row, with soft bricks you should
be able to scrape or cut the entire affected brick out and replace it. Use a
mortar of kaolin and alumina hydrate to fill the gaps 60/40 works for me.
Feri.
Theresa & David Woof on tue 25 apr 00
ginny, have you considered faulty brick composition? salt leaves a glazed
deposit on the surface and then in subsequent fireings eats its way into the
brick and the surface begins to appear blistered and slaggy as the salt
"fluxes" the refractory material. eventually underlying crumbly also becomes
evident.
you didnt indicate whether your kiln was manufactured or self constructed
and with new or used brick. If new, dont fiddle around and compromise your
warrantee thinking this is your fault because of one fireing with three
salted shelves well covered with shelf wash. there would be very little
residule salting under such conditions. the salt would first need to boil
through the wash.
old soft brick gets crumbly and no amount of itc will work its magic, and
it is magic stuff, if the underlying material will not physicaly support it.
david woof
earth and fire studios
tomah, wi 54660
earth&fire@tomah.com
ginny bivaletz on wed 26 apr 00
david, my kiln was manufactured with all new
materials. the kiln shelves were not coated with wash
on the sides and where the sides of those shelves were
within a few inches of kiln door and near burner is
where i have the damage. there were all these bubbles
on the sides of those shelves after the firing so i am
assuming it was salt damage.the bottoms of all the
ware on those shelves were salt glazed but did not
stick because of the kiln wash. i am going to try
scraping out any crumbly brick that is left and hope
the itc will hold on to the more stable brick. thanks
for responding. ginnyB on orcas island, washington
--- Theresa & David Woof wrote:
> ----------------------------Original
> message----------------------------
> ginny, have you considered faulty brick composition?
> salt leaves a glazed
> deposit on the surface and then in subsequent
> fireings eats its way into the
> brick and the surface begins to appear blistered and
> slaggy as the salt
> "fluxes" the refractory material. eventually
> underlying crumbly also becomes
> evident.
>
> you didnt indicate whether your kiln was
> manufactured or self constructed
> and with new or used brick. If new, dont fiddle
> around and compromise your
> warrantee thinking this is your fault because of one
> fireing with three
> salted shelves well covered with shelf wash. there
> would be very little
> residule salting under such conditions. the salt
> would first need to boil
> through the wash.
>
> old soft brick gets crumbly and no amount of itc
> will work its magic, and
> it is magic stuff, if the underlying material will
> not physicaly support it.
>
> david woof
> earth and fire studios
> tomah, wi 54660
> earth&fire@tomah.com
>
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