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martintay
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There`s something seriously wrong
Agreed but I don`t think that is causing the "Cracks"Have you used some new separating liquid on contact points?
Could it be that it was absorbed by the ceramic and created bubbles during baking
Use add on with glaze liquid for your contacts..I've had the strangest thing happen with Noritake recently. I get bubbles appear correction firings, particularly on contact areas. When I grind them they don't go down to the opaque or metal work, I thought maybe under firing but the translucency looks good and they aren't porous otherwise. If I try to trim out and add more ceramic I then get tension cracks. Any ideas?
Just thought i'd update on my problems.Yeah, the two extra firings probably don't help but it still shouldn't happen.
The crowns my colleague fired were done in a different furnace, albeit the same manufacture and same firing parameters so I'll also try using the other furnace and see if it makes a difference