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A defect that appears as irregular, bare patches of fired body showing through the glaze where it has failed to adhere to or wet the body on firing. The cause is a weak bond between glaze and body; this may result from greasy patches or dust on the surface of the biscuit ware or from shrinkage of the applied glaze slip during drying.
The cavitation involved in crazing allows the material to achieve plastic strain faster. The presence of cracks or defects in bulky samples will favor the initiation of crazing, as these defects are points of high concentration of stresses and can cause the formation of initial microvoids. Crazes grow on the plane of maximum principal stress.
These deliberate glazing effects are usually known as "crackle", with crackle[d] glaze or "crackle porcelain" being common terms. It is typically distinguished from crazing , which is accidental craquelure arising as a glaze defect , although in some cases, experts have difficulty in deciding whether milder effects are deliberate or not. [ 10 ]
Would the phrase “That’s just icing on the cake” have the same meaning if it was “That’s just glaze on the cake”? It certainly doesn’t have the same ring to it, but what really ...
3. Celebrate Function, Not Just Form. Your body is more than a sculpture to be admired. It is the vehicle or vessel for your life and through which you may accomplish your dreams.
A good fit is critical to avoid some glaze defects. Glost firing A firing in a kiln to convert the unfired glaze surface to a glassy surface coating. Also called glaze firing. Greenware Unfired clay articles Grog See chamotte, above. Gum arabic A natural gum used as a binder to enable the glaze to increase the adherence to the body.
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A second typical defect is from poor design and construction. An example of this would be a ceramic piece with a handle too thin to support the weight of the cup. A third manufacturing defect is careless firing: a ceramic piece that has been fired too rapidly or allowed to dry unevenly will crack or break. [4]: p.20