Pat Southwood on sun 13 may 07
Hi,
Can anyone tell me please roughly what sort of temp. you would have to =
fire a sealed saggar in order to volatize cobalt oxide ?
I cant find the info in any books I have, they only mention copper, and =
the archives mention it but dont specify any temps.
Thanks.
Pat Southwood
pat@southwood4.fsnet.co.uk
Ivor and Olive Lewis on mon 14 may 07
Dear Pat Southwood,=20
I calculate the minimum temperature for evaporation from the solid to be =
about 950 deg C but the yield would be insignificant.
To get a Cobalt compound that would evaporate rapidly I suggest you =
employ Cobalt Chloride. This would be available from a Wholesale =
Chemical Supplier. The solid melts at 740 deg C and boils at 1049 deg C. =
So above Cone 04 you should be able to saturate the saggar atmosphere =
with a Cobalt rich gas.
If Chromium changes from Green to Red, I wonder what Cobalt blue will =
change to when it settles on a white tin glaze. Just speculating ! ! !
Hope your trials are successful.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Marcia Selsor on mon 14 may 07
I have used a lttile cobalt sulfate and it will volatilize much lower
than cobale oxide.
I fire my saggars to 1600 F. and include salts in the concoction.
Marcia Selsor
http://marciaselsor.com
On May 13, 2007, at 9:24 AM, Pat Southwood wrote:
> Hi,
> Can anyone tell me please roughly what sort of temp. you would have
> to fire a sealed saggar in order to volatize cobalt oxide ?
> I cant find the info in any books I have, they only mention copper,
> and the archives mention it but dont specify any temps.
> Thanks.
> Pat Southwood
> pat@southwood4.fsnet.co.uk
Ron Roy on mon 14 may 07
Hi Pat,
Hamer says it's unaffected by oxidation or reduction and is not volatile
even at 1400C.
I don't think you are going to get it to move.
RR
>Hi,
>Can anyone tell me please roughly what sort of temp. you would have to
>fire a sealed saggar in order to volatize cobalt oxide ?
>I cant find the info in any books I have, they only mention copper, and
>the archives mention it but dont specify any temps.
>Thanks.
>Pat Southwood
>pat@southwood4.fsnet.co.uk
>
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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