Ulf Cordes on fri 4 dec 09
Hi,
many glass/glaze models exist in the literature. It is difficult to
decide which model is the most appropriate. Even experimental
viscosity/temperature data from various laboratories differ by 50=B0C or mo=
re.
- I'm locking for literature for glaze melting temperature calculation
procedures and tutorials.
- I need to know which glaze viscosity is the most appropriate. Let's
say, when potters use a ^6 glaze (or any other), which glaze viscosity
do they expect? (Yes, they don't think about, but they have a feeling
for the best viscosity.) Concrete: Is it 3.9, 4.0, 4.1 ......?
Regards
Ulf Cordes
ivor & olive lewis on sat 5 dec 09
Dear Ulf Cordes,
If you wish to delve into the theory of Silicate Glass Science then I
suggest you get hold of a copy of.....
Woldemar A. Weyl and Evelyn Chostner Marboe, "The Constitution of Glasses",
Volume 2 Part 1. Ch XIX, Viscosity and Material Transport. John Wiley. 1967=
.
For an empirical view of the effects of the major constituent oxides in the
preparation of glazes see the table and commentary in Frank Hamer, "The
Potter's Dictionary of Materials and Techniques " under the caption
"Viscosity" ISBN 0-8230-4210-3
For models of glass structures then Zachariason's model seems to be the mos=
t
favoured and the topic is discussed in Kingery, Bowen and Uhlmann,
"Introduction to Ceramics". ISBN 0-471-47860-1.
Best regards,
Ivor Lewis,
Redhill,
South Australia
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