Wollastonite Powder For Ceramic

(1) Lowering the sintering temperature: the traditional ceramic raw material is mainly Kaolin, which belongs to si-al system and is sintered at high temperature (1250 ~ 1350 °c) . The main crystalline phase is mullite. Wollastonite and Kaolinite should form anorthite at 900 ~ 100 °C, which is much lower than the reaction temperature of Kaolinite to mullite.

(2) Shorten the sintering period: Because the Wollastonite powder particles are needle-shaped, the Wollastonite needle-shaped crystals become the channel of moisture loss during the drying and sintering process, so the drying and alkane become fast, thus shorten the sintering period and improve the working efficiency.

(3) increasing the strength of the body and the products: the needle-like crystal of Wollastonite presents intertexture structure in the body, the Coefficient of linear expansion of Wollastonite is small, the volume shrinkage during firing is small, the intertexture structure of residual Wollastonite increases the mechanical strength of the body and the products, which is useful for making high strength ceramics.

(4) Reducing the hygroscopic expansion: The ceramics containing Wollastonite can add little or no alkali metal compound flux, the fired products contain low alkali, so the moisture absorption rate of the products is low and the durability of the products can be improved.

(5) Making low dielectric insulating ceramics: Wollastonite itself has good insulation, low dielectric loss and needle-like crystal, the moisture absorption of fired ceramics is low, which is an ideal material for making high strength electrical insulating ceramics.

(6) Reduce body and glaze defects: Wollastonite itself does not contain volatile gas, so that body defects, so that the glaze does not produce eye, pit. The low expansion and fusibility of Wollastonite are favorable for making low fat expansion and low temperature glaze.

(7) Production of high-temperature ceramic mold:gypsum mold strength is low, use temperature is low, can not meet the large-scale high-yield. The powder bulk density of this project can reach over 60% when the bulk density is less than 1. It is an ideal material for developing high temperature and high strength ceramic mould.