Karen Latorre on wed 25 jul 07
Does anyone know what the melting temperature is for the Ferro frits 3292
and 3293?
Thanks in advance,
Karen
www.karenlatorre.com
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Karen Latorre on fri 27 jul 07
I finally found the melting temp for 3292 buried within a pdf file from
Laguna. An email to them gave me the melting temp for 3293 this evening.
Posting the info here in case someone else is curious and has been
unsuccessful in their web searches for the info:
Ferro Frit 3292 1650F
Ferro Frit 3293 1550F
Regards,
Karen
www.karenlatorre.com
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Bill Merrill on sat 28 jul 07
One of the important things to remember about frit( or other base glaze
materials) is that each frit has a different base. The dominating
number in the RO column will make the base high calcium, high barium,
etc. which will be helpful to know when choosing colorants for the glaze
as colorants are effected by the base.
Also remember the eutectic point isn't the average between the two frits
melting points. For example flint has a high melting point, but used in
small amounts it will lower the melting point of for example feldspar.
Bill =20
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Karen
Latorre
Sent: Friday, July 27, 2007 4:09 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Ferro Frits 3292 and 3293 Melting Temp
I finally found the melting temp for 3292 buried within a pdf file from
Laguna. An email to them gave me the melting temp for 3293 this evening.
Posting the info here in case someone else is curious and has been
unsuccessful in their web searches for the info:
Ferro Frit 3292 1650F
Ferro Frit 3293 1550F
Regards,
Karen
www.karenlatorre.com
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Karen Latorre on mon 30 jul 07
Hi Bill,
I understand and agree with your points. I'm getting a really beautiful
turquoise with copper and the F12 (reminds me of the caribbean!).
I also understand regarding eutectics. We studied them extensively back
in university, but with regards to steel (in one of the engineering
materials science courses). Steel interestingly has multiple eutectic
points. It's been 20 years, but this is one concept that did stick!
Regards,
Karen
www.karenlatorre.com
>The dominating
>number in the RO column will make the base high calcium, high barium,
>etc. which will be helpful to know when choosing colorants for the glaze
>as colorants are effected by the base.
>
>Also remember the eutectic point isn't the average between the two frits
>melting points.
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Ivor and Olive Lewis on wed 1 aug 07
Dear Karen Latorre,
You tell us <<...Steel interestingly has multiple eutectic points...>
Can the same Science be applied to Ceramic Frits ?
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Karen Latorre on thu 2 aug 07
>You tell us <<...Steel interestingly has multiple eutectic points...>
>
>Can the same Science be applied to Ceramic Frits ?
First a disclaimer, it has been 20 years since university so I'm just
glancing through my old texts and see some "ceramic" eutectic diagrams
showing more than one low point in the diagram. I'm also reading that the
liquid to 2 solid phase conversion temperature is called the "eutectic" and
a solid to 2 solid phase change is called a "eutectoid", so I misspoke when
I mentioned multiple eutectics. There are definitely multiple low
temperature points on the steel (Fe - FeC) diagram. There are also 5 other 3
phase reaction names (monotectic, monotectoid, syntectic, peritectic, and
peritectoid) all defining a "lowest temperature" point in a diagram where
either 1 phase becomes 2 or vice versa, with phases being either liquid or
solid.
So now to your question, in one of my texts there's a SiO2 - Al2O3 phase
diagram. It shows a liquid to 2 solids point (eutectic) at 5.5%Al2O3 where
the composition decomposes from a liquid to a crystal structure of
cristobalite + mullite. All the diagrams in my texts are for 2 materials. I
would guess as soon as you introduce a third material (or fourth, fifth, etc
as we see in some frits), that you may very well see more than 1 eutectic,
with the liquid material decomposing to 2 solid phase materials (with the 2
solids being 2 of the multiple materials in the base composition). This is
just a guess though. My own studies concentrated more on machine design
rather than materials science, so I don't have any more advanced texts on
hand.
Does anyone else know a definitive answer for this?
Karen
www.karenlatorre.com
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