Causes of ceramic embryo cracking 2

(4) To glaze the ceramic body, when the gap between thickness and thickness is too large, it is easy to cause the thinner part (usually the mouth edge of the register) too wet, these parts will dry later

 

Withstand the intrusion of external forces in the process of dryness.

 

(5) When the dried billet is placed in a humid environment, the billet will absorb water again. This is a very special phenomenon. I have personally seen a semi-dry body absorb water again, and when the body softened to a certain extent, it collapsed under its own weight. When a dry blank is placed in a wet environment, it expands as it reabsorbs water, which creates tension later in the drying process where the difference between thickness and thickness is large. Those ceramic billets with relatively little clay content, such as some low-temperature white pottery mud and porcelain mud, because their green strength is too low to withstand the tension generated in the process of water absorption, and then appear many small cracks, and these small cracks can only be visible after plain burning.