Application of Kaolin Porcelain

Ceramic technology is the earliest and most widely used field of using kaolin. The general dosage is 20% to 30% of the secret recipe. The function of kaolin in porcelain is to introduce Al2O3, which is beneficial for the conversion of zirconium corundum, improving its organic chemical reliability and sintering compressive strength. During firing, kaolin dissolves and transforms into zirconium corundum, which is a key structure for producing compressive strength of the body. This can avoid product deformation, increase firing temperature, and also make the body have a certain degree of whiteness. At the same time, kaolin has a certain degree of plasticity, adhesion, floatability, and fusion ability, granting excellent formability to porcelain clay and glaze, making porcelain clay beneficial for vehicle and grouting, and conducive to molding. If used in cable cables, it can improve insulation performance and reduce its dielectric loss.

Porcelain not only strictly manages the plasticity, fusion, dry shrinkage, dry compressive strength, sintering shrinkage, sintering characteristics, fire resistance, and post firing whiteness of kaolin, but also involves organic chemical characteristics, especially the presence of chromogenic elements such as iron, titanium, copper, chromium, and manganese, which reduces the post firing whiteness and causes color spots.

The grain size distribution of kaolin is generally specified as the denser the higher, so that the porcelain clay has excellent plasticity and dry compressive strength. However, the grain size distribution of seasoning needs to be improved for casting processes that specify rapid casting, accelerated grouting rate and dehydration rate. In addition, the difference in the crystalline level of Kaolinite in kaolin will also significantly harm the performance of porcelain body. With a good crystalline level, the plasticity and fusion ability will be low, the dry and dry folding will be small, the sintering temperature will be high, and the residue composition will also be reduced; On the contrary, its plasticity is higher, its dryness is greater, its sintering temperature is lower, and its corresponding residue composition is also higher.