Causes and solutions of problems in the finished bone china cup

Causes of problems in the finished bone china cup and solutions Answer: ⑴The formula is a potential factor. After high-temperature firing, the stress is released. ⑵Irrationality in the design of the shape of the vessel ⑶Incorrect molding operation and uneven drying. ⑷ Improper operation and control of the firing process. Defects of glaze in bone china cup products and how to overcome them? Answer: Mainly include: glazed corrugated, dull glazed surface, glaze reduction, glaze bubble and pinhole, etc. The main methods to overcome are: when the glaze surface is corrugated, the specific gravity of the glaze slurry can be reduced, the high temperature viscosity of the glaze can be reduced, and the temperature difference in the kiln can be reduced. When the glaze is matt, the glaze formula is reasonably adjusted, and the firing temperature of the frit is reasonably set to reduce the impurities brought in during the ball milling. It can be fired with a reducing flame to shorten the high-temperature cooling time. When shrinking the glaze, the drying shrinkage of the glaze layer is reduced, and the preheating stage is slow. When glazing bubbles and pinholes, reduce the high temperature decomposition products contained in the raw materials, reduce the specific gravity of the glaze slurry, and avoid over-burning. Reasons for glaze shrinkage of ceramic tableware cups and how to overcome them. Answer: Reasons for glaze shrinkage: (1) The glaze has poor wettability to the blank, high temperature viscosity, and high surface tension. (2) Dry shrinkage of the glaze layer (3) Poor adhesion of the glaze layer to the green body (5) Long storage time of the green glaze (5) When the glaze is fired, the temperature rises too rapidly in the initial stage of preheating. Overcoming methods: (1) Reduce the content of clay, zinc oxide, and aluminum oxide. ⑵Increase the granularity of glaze slurry and reduce the specific gravity of glaze slurry. (3) Increase the preheating period of firing time.
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