Monthly Tech-Tip | No tracking! No ads! |
The plastic porcelain has 6% drying shrinkage, the coarse stoneware has 7%. They dried side-by-side. The latter has no cracking, the former has some cracking on all handles or bases (the lower handle is completely separated from the base on this one). Why: The range of particle sizes in the stoneware impart green strength. The particles and pores also terminate micro-cracks.
Glossary |
Green Strength
The green strength of clay bodies is an important property, it makes them resistant to breakage or damage during handling in production. |
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Glossary |
Drying Shrinkage
Clays used in ceramics shrink when they dry because of particle packing that occurs as inter-particle water evaporates. Excessive or uneven shrinkage causes cracks. |
Glossary |
Drying Crack
During drying clays and porcelains shrink as they become rigid. When this occurs unevenly, cracks are the result. |
Glossary |
Particle Size Distribution
Knowing the distribution of particle sizes in a ceramic material is often very important in assessing its function and suitability for an application. |
Troubles |
Cracking of Clays During Drying
The best way to avoid drying cracks when making ceramics or pottery is to avoid doing the things that cause it. Do not just blame the clay, anything can technically be dried. |
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