As the raw material of ceramics, quartz has non plasticity. Quartz transforms into mullite crystal at high temperature, which makes porcelain have high mechanical strength and chemical stability. Quartz can increase the translucency of green body and is a good raw material for preparing white glaze.
(1) Quartz is a kind of barren raw material, which can adjust the plasticity of the slurry, reduce the shrinkage, shorten the drying time and prevent the deformation (including deformation and collapse) of the green body.
(2) In the process of heating up, crystal transformation and volume expansion appear, which can counteract the shrinkage of green body. Because the crystal transformation of quartz will cause volume change, the cooling and heating rate should be carefully controlled during the heating and cooling process to avoid cracking of products.
(3) During sintering, the shrinkage of the blank is offset by the thermal expansion of quartz; Moreover, when a large number of glass phases appear, quartz becomes the framework of ceramics, which can prevent the green body from bending and deformation during firing.
(4) In high temperature, quartz has strong chemical affinity and can combine with other oxides. In high temperature, the viscosity of liquid phase is high, which can increase the binding ability of green body.
(5) Quartz can increase the mechanical strength and transparency of the green body.
(1) In the glaze, quartz is fused by many fusible materials Cao, Na2O, K2O and MgO to produce transparent quartz glass, which makes the glaze bright and improves the gloss of glaze.
(2) The thermal expansion coefficient of quartz in glaze is small and the heat resistance is good.
(3) The softening temperature of quartz is high, and the viscosity of liquid phase is high at high temperature.
(4) Quartz can increase the mechanical strength of glaze, improve the hardness of glaze, and make the ceramic crystal wear-resistant, and the chemical stability is good, and it is not affected by acid erosion.
(5) Quartz can make the glaze transparent and bright.
In the production of glazed tiles, the amount of quartz in the body is generally 10-20%, less in the body of one firing glaze brick, generally 10-15%, and 20-40% in glaze frits. The white billet requires higher purity of quartz, while the colored billet can use quartz with lower purity.
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