The function of wollastonite in ceramic glaze
Publish Time:
2025-02-10
Wollastonite can significantly improve the gloss, smoothness and adhesion of the glaze surface, while reducing the glaze defects (such as pinholes, cracks). Studies have shown that adding 5% -10% wollastonite powder to the glaze can increase the glaze gloss by 10% -15% and reduce the glaze defect rate by 30% -40%.
Wollastonite plays a variety of important roles in ceramic glazes, mainly in the following aspects:
1. Improve the quality of glaze
Wollastonite can significantly improve the gloss, smoothness and adhesion of the glaze surface, while reducing the glaze defects (such as pinholes, cracks). Studies have shown that adding 5% -10% wollastonite powder to the glaze can increase the glaze gloss by 10% -15% and reduce the glaze defect rate by 30% -40%.
2. Reduce the coefficient of thermal expansion
The low thermal expansion coefficient of wollastonite (about 6.5 × 10-6/° C) can effectively reduce the thermal stress of the glaze in high temperature environment and improve its thermal shock resistance. For example, adding 1% wollastonite to the glaze is enough to reduce the thermal expansion, so that the glaze will not crack after being exposed to air.
3. Reduce the firing temperature
Wollastonite can form a eutectic with other components in the glaze at high temperature, thereby reducing the firing temperature and saving energy. Adding wollastonite to traditional glaze formulations can reduce the firing temperature from 1280 ° C to 1150 ° C-1200 ° C, saving about 15% -20%.
4. Improve the chemical stability of the glaze
The alkaline nature of wollastonite allows it to disperse uniformly with pigments in acidic media, improving the chemical stability of the glaze and enhancing the corrosion resistance of the coating.
5. Reduce costs
Wollastonite can replace some expensive white pigments (such as mixtures of silica and calcium oxide), while reducing the viscosity of the glaze, thereby reducing production costs.
Overall, the application of wollastonite in ceramic glazes not only enhances the physical and chemical properties of the glaze surface, but also significantly reduces production costs and energy consumption, making it an efficient functional mineral material.
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Huarong Silicate Limited Liability Company, Xinyu City
Address: Renhe Township, Yushui District, Xinyu City, Jiangxi Province
Mobile:13907907059
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