Polyvinyl alcohol (PVA) is a commonly used additive in the ceramic production process. It mainly plays the role of a binder during the calcination of ceramic bodies. Specifically, PVA can form a polymer bonding structure, which can improve the strength of the ceramic molded body and reduce cracks and deformation during the preparation process. In addition, PVA can also prevent the surface of the ceramic body from drying out and warping during the heating process, as well as prevent problems such as thermal shock and thermal stress.
The quality and usage of PVA have a decisive influence on the quality and performance of ceramic bodies. Excessive addition of PVA may lead to an increase in pores in ceramic products and a decrease in the mechanical strength of ceramic molded bodies.
The calcination temperature has a great influence on the volatilization rate and thermal decomposition of polyvinyl alcohol. Therefore, when controlling the calcination process, the thermal stability of PVA needs to be considered to avoid excessively high or low temperatures causing thermal decomposition of PVA to produce gas, which will affect the performance of the ceramic body. Since the firing process of ceramic products is relatively complex, with a wide range of firing temperatures and long temperature rise and fall times, it is necessary to accurately control the use of PVA during the preparation and firing process of ceramic products to avoid damage to the performance and quality of ceramic products. Negative impact.
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