F. Melville on thu 9 jan 97
Tadzu, I have done lapidary work in the past and yes, lapidary
polishing grit is silicon carbide, although the final polishing agents used
are often alumina and cerium oxide or household detergent powder powder.
Various s.c. grits are used, the finest one being about 400 mesh, and I am
sure you can get all from a lapidary supplier.
Francoise
F. Melville
P.O. Box 95
Port Edward, B.C.
Canada V0V 1G0
Ph.: 250 628 9224
Email:fmelvill@mail.kaien.com
Fax: 250 628 9226
karolyn snarr on mon 27 nov 00
Hi!
I am looking for a substitution for silicon carbide. My use for it is in
glazes, cone 6, to create crater textures. I know that it works but it is
expensive and hard to find. Does anyone out there have any suggestions?
Thanks,
Karolyn
_____________________________________________________________________________________
Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com
Ababi Sharon on tue 28 nov 00
Again, Lana Wilson will give you all the answers!
----- Original Message -----
From: "karolyn snarr"
To:
Sent: Monday, November 27, 2000 4:59 PM
Subject: silicon carbide
> Hi!
> I am looking for a substitution for silicon carbide. My use for it is in
> glazes, cone 6, to create crater textures. I know that it works but it is
> expensive and hard to find. Does anyone out there have any suggestions?
> Thanks,
> Karolyn
>
____________________________________________________________________________
_________
> Get more from the Web. FREE MSN Explorer download :
http://explorer.msn.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.
>
pedresel on thu 11 jan 01
Dang! I was thinking of ways to get really even heating by wiring up my
shelves;-)
-- Evan in W. Richland who was in a meeting with our meteorologist who
said this gray, boring weather was going to stay for weeks.
Gwyn Ace wrote:
>
> Robert Fournier in his book "Electric Kiln Contstruction notes that although Silicon Carbide is used for Kiln Elements..the shelves are bonded with clay and do not conduct Elecricity...and are therefore safe...in an electric Kiln.
Gwyn Ace on thu 11 jan 01
Robert Fournier in his book "Electric Kiln Contstruction notes that =
although Silicon Carbide is used for Kiln Elements..the shelves are =
bonded with clay and do not conduct Elecricity...and are therefore =
safe...in an electric Kiln.
I have seen many SC shelves and there has been a marked variation in =
appearance and therefore I would presume..methods of manufacture...and =
characteristics.
It would seem prudent to avoid their use in an electric Kiln unless they =
have been tested as non-conducting..as you have wisely done..Regards =
Bob from N.Z. GWYN
Ababi on mon 24 feb 03
You can buy it either from your ceramic supplier or from abrasive store.
It depend what for you need it/
If you want the make reduction in electric kiln, you can buy the very expensive FFF
If you want craters 100# will do it
See some examples in this page
http://members4.clubphoto.com/ababi306910/185990/owner-78e1.phtml
Ababi
Pat Southwood on mon 24 feb 03
Hallo,
Can someone please explain why does fine silicon carbide cause a =
localized reduction when larger particles do not? I dont understand! =
I've only ever come across one grade.
Thankyou.
Pat.
Ababi on tue 25 feb 03
It is easier to explain than to make:
The Soda bubles like in cola, just released at ^6 or around The realeasing of the C,
Carbon cause a local reduction.
http://tinyclick.com/?THU72A
Ababi
---------- Original Message ----------
>Hallo,
>Can someone please explain why does fine silicon carbide cause a localized
reduction when
>larger particles do not? I dont understand! I've only ever come across one grade.
>Thankyou.
>Pat.
>______________________________________________________________________________
>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.
Tommy Humphries on tue 25 feb 03
To obtain the silicon carbide in the finer grits, visit your local custom
jeweler, they either will have some in stock in their supply room, or can
order you some from their supplier...you can get carbide in grits up to
3000, I believe, and can even get some super fine tin oxide from them (used
as a polish)
Tommy Humphries
Watching the pine trees with a bit of trepidation,
as the ice slowly builds
straining the branches till they nearly touch the ground.
In Marshall Texas
Hallo,
Can someone please explain why does fine silicon carbide cause a localized
reduction when larger particles do not? I dont understand! I've only ever
come across one grade.
Thankyou.
Pat.
Pat Southwood on sun 2 mar 03
Hi,
Thanks for the info on silicon carbide. I shouldnt have snoozed through =
so many chemistry lessons at school !
I bought a big lump of the stuff in a stones and crystals shop, having =
only seen it as a grey powder previously.
It is about 5'' high and is beautiful, black with sparkly bits
Pat.=20
iandol on sun 2 mar 03
Dear Friends,
Silicon Carbide is also known as Moissanite, a synthetic gem which has =
all of the qualities of diamond except for hardness. Its hardness lies =
between those of Sapphire and Diamond
It is manufactured by reducing pure quartz with high grade coke or =
Anthracite at temperatures between 2000=B0C and 2500=B0C. The dark =
colour of industrial SiC is due to the presence of Iron. It can adopt =
one of two main crystal habits. As Alpha SiC it forms an hexagonal =
crystal lattice. As Beta SiC it forms a cubic crystal lattice. But there =
are many crystalline variations because both Alpha and Beta can be =
created at the same time and they can stack in differing sequences.
Of interest to potters are the following facts;
Oxidation during production leaves a coating of SiO2 on the surface of =
the grains which prevents further oxidation below 1000=B0C
It will oxidise in air at temperatures above 1000=B0C.
It will react with Molten Sodium Hydroxide and Carbonate in the presence =
of Oxygen creating Sodium Silicate and discharging water and Carbon =
dioxide.
It also reacts with Sodium chloride discharging Carbon dioxide and =
Silicon Tetrachloride, which I suppose is a form of double jeopardy =
because both elements go up the spout!.
It is attacked by free Chlorine as low as 100=B0C but above 1000=B0C =
reacts to form Carbon Tetrachloride and Silicon Tetrachloride.
Used as an artificial reducing agent the reaction will start when the =
silica coating which protects from oxidation dissolves in a melting =
glaze. Freely attacked by any nearby oxides both Silicon and Carbon act =
as reducing agents. The finer the grain size the more rapid the =
reaction. The greater the amount included in the glaze the greater the =
force of the reaction.
Best regards,
Ivor Lewis. Redhill, South Australia
| |
|
