Phil Smith on fri 13 feb 04
Hi Folks,
I have a small gas kiln in need of repair.
It appears that the mortar has melted in spots creating cavities in the
brick. Looks like melted glaze eating into the brick with each firing.
I was thinking I could patch it up and spray interior with ITC to prevent
further erosion.
Laguna sells a product called "Smoothset mortar" but am not sure if this is
the correct product for the task.
I made off with this kiln on the cheap and have no idea what grade bricks
were used in it's construction.
If anyone can give advice or recipes for a patching compound or a course of
action I would be very grateful.
Thanks.
Phil...
logan johnson on sat 14 feb 04
Hi Phil,
Hey! I got it right this time ! Anyway, I collected a couple of recipes from a book (don't remember which one) but haven't tried them so you're on your own there but here's what I can offer :
REPAIR PASTE # 1 REPAIR PASTE # 2
Lincon Fire clay 45 Tenn. ball clay 25
Calcined Kaolin 20 E.P.K 25
Talc 14 Silica 25
Fine Grog 9 Custer feldspar 25
Walnut Shells 9
Sodium Silacate 3
All weights in grams Good Luck!
Phil Smith wrote:
Hi Folks,
I have a small gas kiln in need of repair.
It appears that the mortar has melted in spots creating cavities in the
brick. Looks like melted glaze eating into the brick with each firing.
I was thinking I could patch it up and spray interior with ITC to prevent
further erosion.
Laguna sells a product called "Smoothset mortar" but am not sure if this is
the correct product for the task.
I made off with this kiln on the cheap and have no idea what grade bricks
were used in it's construction.
If anyone can give advice or recipes for a patching compound or a course of
action I would be very grateful.
Thanks.
Phil...
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Logan Johnson Audeo Studios
www.audeostudios.com
"Carpe Argillam!!"
william schran on sat 14 feb 04
Phil wrote:>It appears that the mortar has melted in spots creating
cavities in the
brick. Looks like melted glaze eating into the brick with each firing.<
I doubt that the mortar is melting, unless some one has previously
attempted a fix with regular mortar and not hi-temp mortar.
More than likely something, glaze or whatever has gotten in the brick
and melts/eats the brick in each firing. You'll need to dig out all
of the melted area all the way to clean brick. You may find a better
repair may be with a piece of brick (assuming IFB) wedged into the
void created after you dig out the "stuff".
Bill
Craig Edwards on sat 14 feb 04
Hello Phil:
AP Green makes some nice stuff called Greenpatch 421. Nice, easy to use,
and durable. Moderately priced to.
My wife used to work at a Burner service and Repair. A furnace builder
in Minnepolis. I used to get some of their mortars and castables that
were leftover from different jobs. The price of some of these was enough
to take your breath away.
Cheers
Craig Edwards
New London MN
Phil Smith wrote:
>Hi Folks,
>I have a small gas kiln in need of repair.
>It appears that the mortar has melted in spots creating cavities in the
>brick. Looks like melted glaze eating into the brick with each firing.
>I was thinking I could patch it up and spray interior with ITC to prevent
>further erosion.
>Laguna sells a product called "Smoothset mortar" but am not sure if this is
>the correct product for the task.
>I made off with this kiln on the cheap and have no idea what grade bricks
>were used in it's construction.
>If anyone can give advice or recipes for a patching compound or a course of
>action I would be very grateful.
>Thanks.
>
>Phil...
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
>
>
Ivor and Olive Lewis on sun 15 feb 04
Dear Phil Smith,
Whatever you use try to ensure it has a High Alumina content and as
little free silica as possible in its constitution. Although sodium
silicate may be employed as an adhesive in some fireclay preparations
it may not be sufficiently refractory if you are firing to upper
stoneware temperatures. I would prefer to use Wollastonite and get a
repair agent that sinters rather than fuses.
A second point on technique. Try to remove all contaminated brick
which has been affected and changed into glass. Any left behind will
be a source of future trouble.
Best regards
Ivor Lewis. Redhill, South Australia,
----- Original Message -----
From: "Phil Smith"
To:
Sent: Saturday, 14 February 2004 4:35
Subject: Patching firebrick
> Hi Folks,
> I have a small gas kiln in need of repair.
> It appears that the mortar has melted in spots creating cavities in
the
> brick. Looks like melted glaze eating into the brick with each
firing.
> I was thinking I could patch it up and spray interior with ITC to
prevent
> further erosion.
> Laguna sells a product called "Smoothset mortar" but am not sure if
this is
> the correct product for the task.
> I made off with this kiln on the cheap and have no idea what grade
bricks
> were used in it's construction.
> If anyone can give advice or recipes for a patching compound or a
course of
> action I would be very grateful.
> Thanks.
>
> Phil...
>
>
______________________________________________________________________
________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your
subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
dneese on sun 15 feb 04
Check the Bailey ceramic supply catalogue on line.
http://www.baileypottery.com/kilns/kilnmaterials.htm#Cements
I just repaired some kiln bricks with a cement made for insulating
firebrick. Seems to have held up well.
Dale Tex
"across the alley from the Alamo"
San Antonio, Texas USA
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