Edouard Bastarache Inc. on fri 22 feb 08
Hello all,
10 years ago I tested 220 C/9=BD redux clays =20
just to mess around with raw materials on=20
Sunday afternoons.
70 out of 220 were made without the use of
spars, and guess what, no problemo at all.
2,500 grams of dry materials were used in
order to make 2 small bottles and a larger piece
to test with my standard, in real situations.
On a theoritical basis, I used the Fe2O3=20
transformed to FeO as a fluxing material to=20
fix silica, at least that is the way my=20
theory goes.
Practical moves is the way to go as far as
I am concerned in ceramics techno;ogy,=20
a mixture of glaze or clay, must first pass=20
the test of fire; the tests were passed with
flying colours....
Gis la revido,
(A la revoyure)
Edouard Bastarache=20
Spertesperantisto
Sorel-Tracy
Quebec
http://www.pshcanada.com/Toxicology.htm
http://www.flickr.com/photos/30058682@N00/
http://www.flickr.com/photos/potier/20321056/
http://perso.orange.fr/smart2000/livres.htm
http://myblogsmesblogs.blogspot.com/
Ron Roy on wed 27 feb 08
Hi Ed,
Bad idea to advise potters to use iron as a flux in high fired bodies - it
encourages cristobalite production.
And just what tests did they pass with flying colours?
Did you use any glazes - if so I would like to see them to see just what
the expansion rates are.
A small bottle is hardly a good test when the real problems will happen
with cassarols. The bigger the pots the more effect you get.
RR
>10 years ago I tested 220 C/9=BD redux clays
>just to mess around with raw materials on
>Sunday afternoons.
>70 out of 220 were made without the use of
>spars, and guess what, no problemo at all.
>
>2,500 grams of dry materials were used in
>order to make 2 small bottles and a larger piece
>to test with my standard, in real situations.
>
>On a theoritical basis, I used the Fe2O3
>transformed to FeO as a fluxing material to
>fix silica, at least that is the way my
>theory goes.
>
>Practical moves is the way to go as far as
>I am concerned in ceramics techno;ogy,
>a mixture of glaze or clay, must first pass
>the test of fire; the tests were passed with
>flying colours....
>Edouard Bastarache
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Edouard Bastarache Inc. on wed 27 feb 08
Hello Ron,
here are some of the glazes used.
I have just remembered I had some
on my Flickr site
http://www.flickr.com/photos/potier/122995041/
http://www.flickr.com/photos/potier/84531887/
http://www.flickr.com/photos/potier/82699461/
http://www.flickr.com/photos/potier/27148536/
http://www.flickr.com/photos/potier/27148380/
http://www.flickr.com/photos/potier/27141939/
http://www.flickr.com/photos/potier/27009045/
http://www.flickr.com/photos/potier/27008660/
http://www.flickr.com/photos/potier/22895817/
Now if you want to know why I fool around with=20
raw materials on Sunday afternoons :
Fooling Around With Clay and Glazes=20
=20
This title looks a lot like the titles of a few famous=20
ceramics books.
I do not want to sound pretentious but it describes=20
very well my journey in the world of ceramics,=20
which seems never-ending.
When I was very young, I did everything to avoid=20
arts lessons but one day at the age of 25, while doing=20
medical post-graduate studies, I was convinced by a=20
fellow student to take up a ceramics course at=20
=AB La Boutique d'Argile=BB( The Clay Shop ) in=20
Quebec City. He told me it was a way to help financially=20
Brother Julien Cloutier who was starting his ceramics=20
school at that time, and an unexpensive one to take some=20
time off (1968).
I was hooked instantly and have always been since.
Not having to sell pots to earn my living I am more=20
interested in making decorative works than utilitarian wares.=20
Having been involved in medical research for quite many=20
years, I have been conditioned by it and have spent=20
much time in testing clays and glazes.
Hence the title of my statement.
I use waste materials from steel plants located in our=20
area to color many of my glazes and clays. I fire=20
most of my work to cone 9 1/2 in reduction in a=20
60 cubic foot downdraft gas kiln, which I built myself.=20
I have also published a book =ABSubstitutions For=20
Raw Ceramics Materials=BB in 8 languages, and a new one=20
"Toxicology Ceramics Glass and Metallurgy" in both=20
our official languages here in Canada
Maybe the title of my next book will be =ABFooling Around=20
With Clay and Glazes=BB,
Who knows?
=20
Gis la revido,
(A la revoyure)
Edouard Bastarache=20
Spertesperantisto
Sorel-Tracy
Quebec
http://www.pshcanada.com/Toxicology.htm
http://www.flickr.com/photos/30058682@N00/
http://www.flickr.com/photos/potier/20321056/
http://perso.orange.fr/smart2000/livres.htm
http://myblogsmesblogs.blogspot.com/
=20
-------------------------------------------------------------------------=
-------
No virus found in this incoming message.
Checked by AVG Free Edition.=20
Version: 7.5.516 / Virus Database: 269.21.1/1299 - Release Date: =
2008-02-26 09:08
Edouard Bastarache Inc. on wed 27 feb 08
Hello Ron,
Smart's take on this issue :
"En réduction et en dévorant la silice cristalline
de ton tesson, FeO forme un silicate de fer : La
Fayalite (Smart)
In reduction and devouring the crystalline silica
of your shard, FeO forms an iron silicate:
Fayalite (Smart)
« Pour ce faire j'ai utilisé l'argile ferrugineuse
Redart et la QIT Red Dust dans 70 recettes de
terre sur 220 et je n'ai pas observé ces défaults,
même après 3 mois. »(Edouard)
Toutes les terres ferrugineuses réagissent
ainsi.(Smart)
« To do this, I used the ferruginous clay Redart
and QIT Red Dust in 70 recipes of clays, out of
220, and I did not observe these faults, even
after 3 months. »(Edouard)
All the ferruginous clays react this way. (Smart)
Yes !! l'épreuve du feu c'est mieux que les
bla-bla-bla...(Smart)
Yes!! the test of fire is better than the
blah..blah...blah...(Smart)
« It may be due to my method of firing, going up
in 17-18 hours, and 60 for cooling. »
(Edouard)
The slower the temperature rise, the more
complete is the reaction, it is valid in many
fields of ceramics. Fast firings is like going to
fast-foods... you have the color but not the
flavor.. just fat and sugar.
(Smart)
Je suis d'accord avec toi mais seulement pour les
terres contenant du fer rouge,
(Smart)
I agree with you but only for clays containing
ferric oxide,(Smart)"
Gis la revido,
(A la revoyure)
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.pshcanada.com/Toxicology.htm
http://www.flickr.com/photos/30058682@N00/
http://www.flickr.com/photos/potier/20321056/
http://perso.orange.fr/smart2000/livres.htm
http://myblogsmesblogs.blogspot.com/
----- Original Message -----
From: "Ron Roy"
To:
Sent: Wednesday, February 27, 2008 12:25 PM
Subject: Re: Back to cristobalite
Hi Ed,
Bad idea to advise potters to use iron as a flux
in high fired bodies - it
encourages cristobalite production.
And just what tests did they pass with flying
colours?
Did you use any glazes - if so I would like to see
them to see just what
the expansion rates are.
A small bottle is hardly a good test when the real
problems will happen
with cassarols. The bigger the pots the more
effect you get.
RR
>10 years ago I tested 220 C/9½ redux clays
>just to mess around with raw materials on
>Sunday afternoons.
>70 out of 220 were made without the use of
>spars, and guess what, no problemo at all.
>
>2,500 grams of dry materials were used in
>order to make 2 small bottles and a larger piece
>to test with my standard, in real situations.
>
>On a theoritical basis, I used the Fe2O3
>transformed to FeO as a fluxing material to
>fix silica, at least that is the way my
>theory goes.
>
>Practical moves is the way to go as far as
>I am concerned in ceramics techno;ogy,
>a mixture of glaze or clay, must first pass
>the test of fire; the tests were passed with
>flying colours....
>Edouard Bastarache
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
______________________________________________________________________________
Clayart members may send postings to:
clayart@lsv.ceramics.org
You may look at the archives for the list, post
messages, change your
subscription settings or unsubscribe/leave the
list here: http://www.acers.org/cic/clayart/
Moderator of the list is Mel Jacobson who may be
reached at melpots2@visi.com
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.21.1/1299 -
Release Date: 2008-02-26 09:08
Edouard Bastarache Inc. on wed 27 feb 08
Hello Ron,
"And just what tests did they pass with flying
colours?" (Ron)
The usual tests like colour, shrinkage,
absorbtion, plasticity,
effects of bisque firing, glaze application and
firing, etc.(Edouard)
"Did you use any glazes - if so I would like to
see them to see just what
the expansion rates are." (Ron)
I used my usual glazes, but the experiment took
place 10 years ago, so it
is too late to take pictures. (Edouard)
"A small bottle is hardly a good test when the
real problems will happen
with cassarols. The bigger the pots the more
effect you get."(Ron)
If you read my last post carefully, you will see
that on top of throwing
2 small bottles, I also threw larger and taller
pots.(Edouard)
I am not trying to convince anyone to do what I
did, I am only reporting
what I did; first of all rely on testing of every
step of the process, which
I did. At least that is what I learned 40 years
ago.
Gis la revido,
(A la revoyure)
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.pshcanada.com/Toxicology.htm
http://www.flickr.com/photos/30058682@N00/
http://www.flickr.com/photos/potier/20321056/
http://perso.orange.fr/smart2000/livres.htm
http://myblogsmesblogs.blogspot.com/
Ivor and Olive Lewis on thu 28 feb 08
I would support the idea that Iron Oxide and free silica interact to =
produce Iron Silicate Fe2SiO3 Aka Fayalite. This has a melting point of =
1205 deg C 2201 deg F.
This is one of those instances of the intervention of Solid State =
Reactions, a common but little known process which is influential in the =
maturation of glazes and clay.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Edouard Bastarache Inc. on thu 28 feb 08
Hello Ivor,
thanks for the info.
I have just forwarded your email to Smart.
Gis la revido,
(A la revoyure)
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.pshcanada.com/Toxicology.htm
http://www.flickr.com/photos/30058682@N00/
http://www.flickr.com/photos/potier/20321056/
http://perso.orange.fr/smart2000/livres.htm
http://myblogsmesblogs.blogspot.com/
----- Original Message -----
From: "Ivor and Olive Lewis"
To:
Sent: Thursday, February 28, 2008 1:57 AM
Subject: Re: Back to cristobalite
I would support the idea that Iron Oxide and free
silica interact to produce Iron Silicate Fe2SiO3
Aka Fayalite. This has a melting point of 1205 deg
C 2201 deg F.
This is one of those instances of the intervention
of Solid State Reactions, a common but little
known process which is influential in the
maturation of glazes and clay.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
______________________________________________________________________________
Clayart members may send postings to:
clayart@lsv.ceramics.org
You may look at the archives for the list, post
messages, change your
subscription settings or unsubscribe/leave the
list here: http://www.acers.org/cic/clayart/
Moderator of the list is Mel Jacobson who may be
reached at melpots2@visi.com
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.21.1/1302 -
Release Date: 2008-02-27 16:34
| |
|
