Rob Muylaert on tue 17 jul 01
Date: Tues, 17 jul 2001
From: Rob Muylaert (Netherlands)
Subject: Thixotropic/hard/soft/ bang it around clay
Hope you can read my English
It looks very similar to some glazes which contain a large amount of clay
and have been standing a long time. They can look very dry, not a liquid
anymore, but after stirring they are surprisingly fluid. This has nothing to
do with thixotropy but with the yieldvalue of a bingham fluid.
In a normal fluid (newton fluid) particles are moving like layers sliding
over
each other. In a binham fluid particles are interlocked and you first need
some force to change this state and then the particles act the same as
in a normal fluid.
Rob Muylaert Keramiek
http://www.rmkeramiek.nl
info@rmkeramiek.nl
---------------------------------
> Date: Mon, 16 Jul 2001 21:59:35 -0700
> From: Earl Brunner
> Subject: Thixotropic/hard/soft/ bang it around clay
>I have used Tom Coleman Porcelain (made by Aardvark) for several years
>now. This porcelain can be very stiff until you get it moving, slamming
>the bag around would definitely make a difference in softening it up.
>However, I have never noticed any thixotropic tendencies with this
>porcelain while throwing. It is one of the best porcelains that I have
>ever thrown. I'm wondering if there isn't some other mechanism at work
here.
--
>Earl Brunner
>http://coyote.accessnv.com/bruec/
>bruec@anv.net
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