Carolyn Boeri on wed 3 mar 10
Hi all,
I am about to purchase some kiln shelves for a wood fire and have been =3D
advised not to buy the nitride ones with the slits as they crack in two =3D
in fast cools and over all do not hold up as well as the regular silicon =
=3D
carbide. Does anyone have info on what I should get?
Thanks,
Carolyn
Brandon Phillips on wed 3 mar 10
C-
I have the oxide bonded with the slits, a little thicker than the nitrides
but not as thick as traditional shelves. Mine have been through 40-ish
salt firings and 18 wood/salt firings and they're in good shape. I also
have some of the regular old 3/4" sic shelves which have not held up as
well as the thinner oxide bonded. Some of them have cracked in the exact
spots where the slits are in the ox. and nit. shelves. Some manufacturer
is onto something there I think. I'd be happy to send you photos of them
if you like.
Brandon Phillips
www.supportyourlocalpotter.com
> Hi all,
> I am about to purchase some kiln shelves for a wood fire and have been
> advised not to buy the nitride ones with the slits as they crack in two i=
n
> fast cools and over all do not hold up as well as the regular silicon
> carbide. Does anyone have info on what I should get?
> Thanks,
> Carolyn
>
Lee Love on wed 3 mar 10
On Wed, Mar 3, 2010 at 1:34 PM, Carolyn Boeri wr=
=3D
ote:
> Hi all,
> I am about to purchase some kiln shelves for a wood fire and have been ad=
=3D
vised not to buy the nitride ones with the slits as they crack in two in fa=
=3D
st cools and over all do not hold up as well as the regular silicon carbide=
=3D
. Does anyone have info on what I should get?
> Thanks,
I use SiCarbide with the slits in Japan in a woodkiln and they worked
very well. I would have brought them back with me, but I sold tthe
kiln to a friend.
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
William & Susan Schran User on thu 4 mar 10
Call the folks at Smith-Sharpe or contact through their web site:
www.kilnshelf.com
They will be able to discuss all your options.
Any nitride bonded shelf is more prone to failure due to uneven thermal
gradient (uneven heat across the shelf), flame impingement (flame right on
shelf, which creates the first problem) and rapid cooling.
Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
On 3/3/10 2:34 PM, "Carolyn Boeri" wrote:
> Hi all,
> I am about to purchase some kiln shelves for a wood fire and have been ad=
vised
> not to buy the nitride ones with the slits as they crack in two in fast c=
ools
> and over all do not hold up as well as the regular silicon carbide. Does
> anyone have info on what I should get?
> Thanks,
> Carolyn
gary navarre on sat 6 mar 10
Hay Folks,
In my search for shelves last year I took Bill's advice and contacted thes=
e folks. We decided on 11 oxide bonded silicon carbide shelves like I had a=
lready been familiar with using in my first wood fired kilns 20 years ago. =
I just finished the first firing of the new Hobagama 2010 and these shelves=
were right up front where all the unfortunate pot action was because after=
I got the vary front of the load to temperature I took a long nap with the=
damper closed. When I awoke the old pyrometers said the kiln was still abo=
ve quartz conversion although much of the color was gone. I decided to reli=
ght the fire with the large coal bed but increased the fire too quickly and=
heard mostly the porcelain pots right up front cracking from thermo shock =
but when I opened the chamber and inspected the shelves they were unscathed=
, so far. Some had a bit of ash glaze drips buildup underneath where the th=
in coat of kiln wash got rubbed off but there were no cracks. There
was one shelf that had a large iron spot...
http://public.fotki.com/GindaUP/ca/kpap/ksf/
... I'll address during the analysis of the first firing when I show the re=
sults of the thin kiln wash coat on the underside of shelves.
Just after I got my order the company that makes the shelves is supposed t=
o have built a new plant near the Twin Cities so their cost and yours would=
be less than when they got them from the plant on the East coast. I intend=
to take advantage of their services again so thanks for the tip Bill and s=
tay in there eh!
Gary Navarre
Navarre Pottery
Navarre Enterprises
Norway, Michigan, USA
http://www.youtube.com/GindaUP
http://public.fotki.com/GindaUP/
--- On Thu, 3/4/10, William & Susan Schran User wrote:
> From: William & Susan Schran User
> Subject: Re: [Clayart] what kiln shelves for wood-firing
> To: Clayart@LSV.CERAMICS.ORG
> Date: Thursday, March 4, 2010, 9:01 AM
> Call the folks at Smith-Sharpe or
> contact through their web site:
> www.kilnshelf.com
> They will be able to discuss all your options.
>
> Any nitride bonded shelf is more prone to failure due to
> uneven thermal
> gradient (uneven heat across the shelf), flame impingement
> (flame right on
> shelf, which creates the first problem) and rapid cooling.
> Bill
>
> --
> William "Bill" Schran
> wschran@cox.net
> wschran@nvcc.edu
> http://www.creativecreekartisans.com
>
>
>
> On 3/3/10 2:34 PM, "Carolyn Boeri"
> wrote:
>
> > Hi all,
> > I am about to purchase some kiln shelves for a wood
> fire and have been advised
> > not to buy the nitride ones with the slits as they
> crack in two in fast cools
> > and over all do not hold up as well as the regular
> silicon carbide. Does
> > anyone have info on what I should get?
> > Thanks,
> > Carolyn
>
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