John Sankey on sat 13 oct 07
The Potter's Dictionary has a section on surface tension, but as
usual for the Hamers gives no references. Has anyone found a
paper that describes actual measurement of surface tension of
glazes (as opposed to merely quoting other's work)?
--
Include 'Byrd' in the subject line of your reply
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Ivor and Olive Lewis on sun 14 oct 07
Dear John Sankey,=20
Though Singer and Singer, "Industrial Ceramics" may not have all of the =
information you need (See page 538) the do have a wonderful list of =
references.
You might also get some leads by reading Cullen Parmelee, "Ceramic =
Glazes", Rexford Newcomb Jr., "Ceramic Whitewares", perhaps Taylor and =
Bull, "Ceramic Glaze Technology" as well as Singer and German, "Ceramic =
Glazes".
Advice I was given when I needed information to aid my understanding was =
to do a literature search by trolling through "Chemical Abstracts". This =
is best done by using key word and searching the annual lists. Since you =
will begin round about 1890 there is very little that can be got at =
through a computer. To get into Ceramic Abstracts (Cambridge) is an =
expensive game.
It is a pity Hamer and Hamer were not more forthcoming with their =
sources. Makes things very difficult for the serious student. What they =
imply is "Trust Us" ! ! !=20
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Taylor Hendrix on mon 15 oct 07
John,
I would love to see what someone comes up with for a direct
measurement of the surface tension of a glaze. My bet is on some kind
of measurement of a fired and cooled glaze on clay.
--
Taylor, in Rockport TX
On 10/13/07, John Sankey wrote:
> The Potter's Dictionary has a section on surface tension, but as
> usual for the Hamers gives no references. Has anyone found a
> paper that describes actual measurement of surface tension of
> glazes (as opposed to merely quoting other's work)?
Michael Wendt on mon 15 oct 07
John,
I think I saw an article in one of the
ACERS publications a while back.
They use a furnace to monitor a cylindrical
sample of the material under study.
A laser beam silhouettes the sample
onto a ccd camera which can store the
shape changes real time in relation to
the measured temperature. As the
sample melts, the sharp corners go,
the glaze spreads and the surface tension
is computed from the degree of spread
that occurs with respect to temperature.
The higher the surface tension, the more
spherical the sample remained seen in silhouette.
Sounded really promising... wish I could
find that article.
Regards,
Michael Wendt
Wendt Pottery
2729 Clearwater Ave.
Lewiston, Id 83501
U.S.A.
208-746-3724
wendtpot@lewiston.com
http://www.wendtpottery.com
http://UniquePorcelainDesigns.com
Paul Lewing on mon 15 oct 07
On Oct 15, 2007, at 4:15 PM, Taylor Hendrix wrote:
I would love to see what someone comes up with for a direct
measurement of the surface tension of a glaze. My bet is on some kind
of measurement of a fired and cooled glaze on clay.
On 10/13/07, John Sankey wrote:
> The Potter's Dictionary has a section on surface tension, but as
> usual for the Hamers gives no references.
The numbers given for surface tension index, like their viscosity
index, are not (as I understand it) actual measurements, but rather a
ranking of different oxides. This was probably just done on the
basis of observation and comparison, rather than actual empirical
measurement.
Paul Lewing
www.paullewingtile.com
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