Russel Fouts on thu 5 feb 04
This is the formula out of Cardew's "Pioneer Pottery"
I want to know the sintering temperature for my glaze.
Tamman (sintering) Temperature of Maiolica Glaze
((Fusion Temp of Glaze + 273 to convert to Kelvin) x (0.55 or 0.6)) - 273
to convert back to Celsius
I come up with the following:
0.55 = 454.65
0.6 = 520.80
However the glaze does not sinter between these temperatures. I'm trying a
higher test tonight.
Have I miscalulated or is this formula for something more "unified" than a
glaze slop? He gives it for ceramic materials and clays.
Thanks in advance.
Russel
Russel Fouts
Mes Potes & Mes Pots
Brussels, Belgium
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Earl Krueger on fri 6 feb 04
On Thursday, Feb 5, 2004, at 11:24 US/Pacific, Russel Fouts wrote:
> This is the formula out of Cardew's "Pioneer Pottery"
> ((Fusion Temp of Glaze + 273 to convert to Kelvin) x (0.55 or 0.6)) -
> 273
> to convert back to Celsius
Russel,
It is interesting to note that the ratio of a
Fahrenheit degree to a Celsius degree is 0.55.
Is it a coincidence that this matches Cardew's factor?
Since, from what little I know, sintering temperature
depends greatly on constituents and particle size
I would imagine that a formula such as this would
give only a gross approximation.
Earl K...
Bothell, WA, USA
Ivor and Olive Lewis on sat 7 feb 04
Dear Russel and Earl.
Yes, that is the equation to get the temperature at which any material
will commence to sinter. But I do not know why Tamman gave us a range
which covers fifty five percent to sixty percent of the melting point
as an Absolute Temperature. It could be that the lower figure applies
to close compacted materials whereas the higher figure applies to
those which are unconsolidated.
The ratio of 9/5 for F/C is coincidental and might be regarded as
fortuitous so it can be disregard.
Best regards to you both,
Ivor Lewis. Redhill, South Australia
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