Monthly Tech-Tip | No tracking! No ads! |
Here is an example of how a cast porcelain piece, L3778G, warps during the glaze firing. Several factors contribute to this failure:
1. It is cast and the walls are very thin.
2. This porcelain is highly vitreous.
3. This shape has no inherent strength to resist rim warping.
Thus the following steps will help to reduce the issue: Switching to machine forming (which orients particles concentrically), reducing the feldspar in the recipe (to reduce fired maturity) or firing lower, casting thicker walls and changing to a more flared shape. There is one other option (borrowed from bone china): Fire the piece upside down on a custom alumina setter fitted to the final rim diameter - then clear glaze it at a lower temperature.
Troubles |
Warping
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Glossary |
Vitrification
The term vitrified refers to the fired state of a piece of porcelain or stoneware. Vitrified ware has been fired high enough to impart a practical level of strength and durability for the intended purpose. |
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