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Showing results for tags 'High temp'.
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I have an upcoming project that requires a high temperature vessel for melting and slow cooling. Normally I would use something like a silicon carbide crucible for this, but the nature of this particular application requires me to break the crucible after every use. With this in mind, I've been toying with the idea of putting together a clay body to make single use crucibles. I'm bad at formulating clay bodies, so I thought I'd seek some advice here. I have a variety of materials available to me already, a few different kinds of kaolin, fireclay, as well as mullite, kyanite, and the usual feldspars etc. My initial thought was to do something like a 50/50 mix of kaolin and kyanite, with perhaps an addition of 2-5% feldspar to soak up a bit of the extra silica. Is there any reason this wouldn't work as a body. Is the feldspar a good idea? Is it something that will cause problems rather than solve them? I don't care about cracking on the cooling cycle as long as it holds together on the way up and for the two-hour soak at temperature. I know this isn't a usual clay body formulation and it's not quite relevant to what most do, but I thought I'd ask and share my results here as a (hopefully) interesting and instructive exercise in engineering clay.