8 reasons for the deformation of bone china cups

I believe that many novice manufacturers will encounter firing deformation during the production of bone china cups. What are the causes of this? Let’s talk about this issue today. We in Guangdong Hosen chinaware ceramic have accumulated 8 points of our own experience after several years of precipitation. Let’s share with you now! 1. The structure of the design of the work is unreasonable or does not meet the requirements of the ceramic materials and techniques used. ①Improper handling of the center of gravity, light on the top and light on the bottom; ②The body shape is too high and too long; the thickness and size of each part are inappropriate and uneven ; Improper mud accumulation, etc. 2. Improper billet formulation, resulting in unbalanced sintering and shrinkage. ①The amount of high-plasticity clay in the billet is too large, and the ignition loss is too large, which will cause the drying shrinkage and firing shrinkage to be too large; ②The amount of flux in the billet is too large. The body has too much liquid phase and low viscosity at high temperature; ③The expansion coefficient of the body and the glaze are not matched properly. 3. The blank preparation process is not strict. ① The blank contains air or impurities; the mixing, stirring, and extraction are not sufficient, and the aging time is short; ②The moisture of the blank is too high or uneven; ③The blank is too fine or the particle gradation is unreasonable, and the particles are arranged in orientation Wait. 4. Improper forming process ①The forming pressure is too small or too large; ②The ceramic art equipment used is not sophisticated, and the vibration is large; ③Incorrect mud throwing during rolling, spinning, and plastic pressing, and improper operations such as forming, trimming, glazing, etc. ④The mud particles used for grouting are too fine; the density is not suitable; the stability is poor; ⑤The model is not evenly wet and dry; the drying temperature of the belt mold is not uniform; the forced demoulding or demoulding is too late; the demoulding operation is improper. 5. Improper drying treatment ①Improper control of the drying system and too fast drying speed; ②Uneven drying of various parts of the blank; ③Uneven placement of the blank or improper placement method. 6. Improper loading and kiln loading process ①The water content of the kiln is too high; ②Use kiln furniture such as saggers and slabs with low structural strength at high temperature; the inner bottom of the used saggers is uneven, cracked, and no cake is used; use Cushion cake with uneven or impurity; ③Incorrect loading of the blank or vibration when moving, causing the bottom of the blank to move away from the cushion, displacement and lowering, and the blank is inclined to one side due to uneven shrinkage during firing; ④Saggar The column has not remained flat, stable, and upright. 7. Improper firing process ①Excessive temperature difference in various parts of the kiln (on the one hand, the problem of the kiln itself; on the other hand, the problem of kiln installation); ②The temperature rises too rapidly during firing; the firing temperature is too high; the high heat holding time is too big. 8. Poor quality of the plaster mold ①The structure of the plaster mold is unreasonable; the manufacturing does not meet the requirements; the specifications are not uniform; the density is inconsistent; ②The moisture content of the plaster mold is uneven; too dry, too wet, and too old; the model is deformed or worn; ③Gypsum The fit between the mold and the mold base is poor and not concentric.
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