Wollastonite: an all-round weapon in the field of architecture and ceramics!

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Wollastonite is an indispensable presence in the building materials and ceramics industry. It has many characteristics that make it widely used in these two fields. First of all, wollastonite does not contain organic matter and various moisture components, so drying shrinkage and firing shrinkage are very small, ensuring the stability and quality of the product.
In building materials, wollastonite can be used to make bricks, tiles and other products, and because of its small firing shrinkage, good fluxing effect and resistance to chemical corrosion, the products made have excellent quality. In the ceramic industry, wollastonite can replace quartz and calcite for glaze formulation, reduce the sintering temperature, reduce the generation of defects, and improve the gloss of the product.
So what properties of wollastonite make it widely used in building materials and ceramics industry?
No.1
Wollastonite does not contain organic matter, adsorption water, crystal water, structural water, etc., so it has the characteristics of drying shrinkage and firing shrinkage. Because of its drying shrinkage and firing shrinkage are very small, to ensure the stability and quality of the product.
No.2
The thermal expansion coefficient of wollastonite is very small, and it has a linear relationship with the increase of temperature, which makes it suitable for low-temperature rapid firing. At high temperatures, wollastonite reacts with clay ingredients to produce anorthite and cristobalite. The volume shrinkage of this reaction is only 1%, so it is suitable for rapid firing at low temperature. At a relatively low temperature, wollastonite and SiO2 · Al2O3 can be eutectic, reducing thermal expansion, reducing product shrinkage, and making its shape more stable.
No.3
The form of wollastonite is needle-like and cross to form a network structure, which is conducive to the discharge of water, so that its drying process is more rapid, easy to press molding.
No.4
Wollastonite also has a good fluxing effect, which can reduce the sintering temperature of the product and reduce the generation of defects such as bubbles and grains. However, it should be noted that excessive use of wollastonite may affect the gloss of the glaze.
No.5
Wollastonite also has excellent acid resistance, alkali resistance and chemical corrosion resistance, suitable for the production of low-loss electric porcelain raw materials.
In summary, wollastonite, as a multifunctional material, plays an important role in the building materials and ceramic industries. Its small drying shrinkage, small firing shrinkage, small thermal expansion coefficient, good fluxing effect, acid and alkali resistance and chemical resistance and other characteristics, making it one of the first choice in these industries.

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