silica carbide and lava glazes
Posted 05 December 2012 - 11:00 PM
Thanks in advance.
Posted 06 December 2012 - 05:51 PM
iirc i tried amounts less than 1% with a volcanic ash base at ^8-9 in oxidation. the result was more sponge toffee than lava.
apparently particle size can seriously affect the outcome
*from what i read fine particle size can encourage localised reduction but i put silicon carbide down at sponge toffee.
I realized after I asked this question, that, it will not work with any glaze, because I have used it tocause localise reduction and that glaze did not crater. Ther must be a certain chemistry that is necessary, but I havn't been able to find much information about high fire crater glazes.
Posted 12 December 2012 - 09:17 PM
I'm doing some tests now. We're doing them as an addition to the slip – not the glaze. He recommended an addition of around 6%. In the tests, they range from 2% to 12%. I also did mixes with other glazes, to see what happens.
edit: I found a link to a rock tumbler website, http://rocktumbler.com/grit.shtml They have the type that we used, the coarsest grit.
Posted 14 December 2012 - 10:20 PM
I have a feeling that we had the wrong material, though. I'll find out the next time I'm at school.
Ceramics by avaviel, on Flickr