Jim and Marge Wade on sun 3 jun 01
I bisque to ^08 with good success.
Marge
>
> At 09:14 AM 6/3/01 -0700, you wrote:
>> Hi all my fellow rakuers (and everyone else!),
>>
>> I have always bisqued to ^04 since that was what I was
>> taught in my raku introductory courses.....
Karen Shapiro on sun 3 jun 01
Hi all my fellow rakuers (and everyone else!),
I have always bisqued to ^04 since that was what I was
taught in my raku introductory courses. I just met a
raku artist who bisques to ^06 (he does very large,
thin pieces) and feels that his pieces are less likely
to break by doing so. I also work thin (not as large,
however) and thought I'd try this hoping to get more
"sturdy" pieces (i.e. less cracking).
I had an accident with one of the pieces bisqued at
^06 and found that I could break up the piece very
easily (much more easily than work fired to ^04.)
So my question to all of you is what temp do YOU
bisque to for raku work? Always trying to learn more
..
Karen in Gualala
=====
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Larry Phillips on sun 3 jun 01
Karen Shapiro wrote:
>
> I have always bisqued to ^04 since that was what I was
> taught in my raku introductory courses. I just met a
> raku artist who bisques to ^06 (he does very large,
> thin pieces) and feels that his pieces are less likely
> to break by doing so.
I would think they'de be more likely to break, though perhaps not more
likely to break in the final firing, but rather in the handling. Higher
firing, I think, at this temperature range, translates directly into
greater strength.
> I also work thin (not as large, however) and thought I'd try this
> hoping to get more "sturdy" pieces (i.e. less cracking). I had an
> accident with one of the pieces bisqued at ^06 and found that I
> could break up the piece very easily (much more easily than work
> fired to ^04.)
That sounds about right. I'd be curious as to how the pieces that you
raku'd turned out though. I think there's a big difference between
strength and thermal shock resistance, and would like to know if the
different bisque temperatures actually made a difference. My gut feeling
is that the difference would be minimal, if any.
> So my question to all of you is what temp do YOU
> bisque to for raku work? Always trying to learn more
I bisque everything (raku, ^5, ^6, ^10) to ^07. Why? Well, when I bought
my used front-loader, it came with a few boxes of cones, including one
each of cones 08, 07, and 06, and it just came naturally to use ^07 as
the middle one.
According to at least one of my tutors, you should bisque to whatever
works in terms of bisqueware strength and absorbency when glazing, and
that tends to be in the range or ^08 to ^03.
--
Procrastinate now!
http://24.113.44.106/larry/
Snail Scott on sun 3 jun 01
Bisquing at higher temperatures makes the clay
more resistant to accidental breakage, as you
observed. Bisquing at lower temperatures reduces
the effects of thermal shock due to the raku
process. Which sort of 'strength' you want is up
to you.
Fair resistance to thermal shock can be achieved
with a properly formulated clay body, and may allow
you bisque at a higher temperature without ill
effects from sudden cooling. If you're not having
such problems now, though, there's no reason to
lower your temperature. If you are, try adding a
bit of kyanite or powdered mica. There are also
other useful additives for this purpose.
What the 'right' temperature is, depends entirely
on your clay body. Someone else's experiences are
not necessarily valid for your clay and type of
work. Post-firing technique matters, too. (If you
spritz your work with water, or even dunk it, your
clay will experience thermal stresses far in excess
of a basic trashcan reduction.) Your friend, even if
he uses the same clay and processes you do, may have
experienced thermal-shock problems with his large
thin work that might not be an issue with your work.
"What works for you" is the only criterion that
applies.
-Snail
At 09:14 AM 6/3/01 -0700, you wrote:
>Hi all my fellow rakuers (and everyone else!),
>
>I have always bisqued to ^04 since that was what I was
>taught in my raku introductory courses. I just met a
>raku artist who bisques to ^06 (he does very large,
>thin pieces) and feels that his pieces are less likely
>to break by doing so. I also work thin (not as large,
>however) and thought I'd try this hoping to get more
>"sturdy" pieces (i.e. less cracking).
>I had an accident with one of the pieces bisqued at
>^06 and found that I could break up the piece very
>easily (much more easily than work fired to ^04.)
>So my question to all of you is what temp do YOU
>bisque to for raku work? Always trying to learn more
>...
>
>Karen in Gualala
>
vince pitelka on sun 3 jun 01
> > I have always bisqued to ^04 since that was what I was
> > taught in my raku introductory courses. I just met a
> > raku artist who bisques to ^06 (he does very large,
> > thin pieces) and feels that his pieces are less likely
> > to break by doing so.
Wares bisqued to cone 06 or 08 are still very strong, easy to glaze, and
they are more thermal-shock-resistant than wares fired to cone 04, and are
therefore more able to withstand the abrupt heating of the raku firing. We
do all of our bisque firing to cone 08.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://www.craftcenter.tntech.edu/
Marvpots@AOL.COM on mon 4 jun 01
Hi Karen:
I bisque at 08, same as I bisque for either subsequent electric cone 6/7 or
gas cone 10 firings and have not had problems at that level.
Any comments?
Marvin Flowerman
marvpots@aol.com
craig clark on mon 4 jun 01
Vince, why is the ware bisque fired to 08 more shock resistent than that
which has been bisqued to either an 06 or an 04?
Craig Dunn Clark
619 East 11 1/2 st
Houston, TX 77008
(713)861-2083
mudman@hal-pc.org
-----Original Message-----
From: vince pitelka
To: CLAYART@LSV.CERAMICS.ORG
Date: Sunday, June 03, 2001 10:03 PM
Subject: Re: bisque temp for raku
>> > I have always bisqued to ^04 since that was what I was
>> > taught in my raku introductory courses. I just met a
>> > raku artist who bisques to ^06 (he does very large,
>> > thin pieces) and feels that his pieces are less likely
>> > to break by doing so.
>
>Wares bisqued to cone 06 or 08 are still very strong, easy to glaze, and
>they are more thermal-shock-resistant than wares fired to cone 04, and are
>therefore more able to withstand the abrupt heating of the raku firing. We
>do all of our bisque firing to cone 08.
>Best wishes -
>- Vince
>
>Vince Pitelka
>Appalachian Center for Crafts
>Tennessee Technological University
>1560 Craft Center Drive, Smithville TN 37166
>Home - vpitelka@dtccom.net
>615/597-5376
>Work - wpitelka@tntech.edu
>615/597-6801 ext. 111, fax 615/597-6803
>http://www.craftcenter.tntech.edu/
>
>___________________________________________________________________________
___
>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.
>
vince pitelka on tue 5 jun 01
> Vince, why is the ware bisque fired to 08 more shock resistent than that
> which has been bisqued to either an 06 or an 04?
Craig -
It is more thermal-shock-resistant because it is more porous, with less of a
glassy phase, and therefore more flexible.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://www.craftcenter.tntech.edu/
Shirley Tschannen on tue 5 jun 01
Yes Marv, what kind of clay are you using and is it the same clay for all or most
of your cone firings? I use a variety of ^6 clays and am getting ready to
upgrade my kiln to ^10 and was curious about this ^08 bisqueing?
Shirley Tschannen
shurjazz@mediaone.net
Marvpots@AOL.COM wrote:
> Hi Karen:
> I bisque at 08, same as I bisque for either subsequent electric cone 6/7 or
> gas cone 10 firings and have not had problems at that level.
>
> Any comments?
>
> Marvin Flowerman
> marvpots@aol.com
>
> ______________________________________________________________________________
> 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.
Ababi on tue 5 jun 01
Does the bisque temperature contribute in any way the size of the crackels?
( in a "x" given recipe?
Ababi
----- Original Message -----
From: "vince pitelka"
To:
Sent: Tuesday, June 05, 2001 7:05 AM
Subject: Re: bisque temp for raku
> > Vince, why is the ware bisque fired to 08 more shock resistent than that
> > which has been bisqued to either an 06 or an 04?
>
> Craig -
> It is more thermal-shock-resistant because it is more porous, with less of
a
> glassy phase, and therefore more flexible.
> Best wishes -
> - Vince
>
> Vince Pitelka
> Appalachian Center for Crafts
> Tennessee Technological University
> 1560 Craft Center Drive, Smithville TN 37166
> Home - vpitelka@dtccom.net
> 615/597-5376
> Work - wpitelka@tntech.edu
> 615/597-6801 ext. 111, fax 615/597-6803
> http://www.craftcenter.tntech.edu/
>
>
____________________________________________________________________________
__
> 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.
>
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