Dave Finkelnburg on sat 6 mar 04
Joe,
You are right, lithium is a lower expansion flux than sodium. It does
lower glaze expansion.
IF you remove X-atoms of a higher expansion flux, say sodium, from your
glaze and replace them with lithium, the glaze Coefficient of Expansion
(COE) will be lower. However, you need to be careful to see that you are
working with the same number of atoms of each. It gets more complicated
because your sodium sources, F-4 and FF3110, also contain alumina, silica
and other things.
To understand your question, we need to know what you removed from your
recipe, and how much, to be replaced with 2% lithium carbonate. If you post
both recipes, then it's possible to answer your question better.
Regards,
Dave Finkelnburg
----- Original Message -----
From: "William Jacob"
Sent: Friday, March 05, 2004 5:52 PM
> 1. How does lithium in a glaze reduce crazing. I assumed it was simply a
> matter of substituting a glaze component with a lower COE for one with a
> higher COE. (Li for Na) But according to my glaze calculating software,
> the glaze with the Li2CO3 has a higher expansion but doesn't show any
> signs of crazing.
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