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The Role of Talc Powder Raw Material in Ceramic Bodies

2024-10-27 16:30:18
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Raw talc that has been manually mined and not processed is called raw talc. When processed by a Raymond mill to a fineness of 200 mesh or more, it is called talcum powder. The role of raw talc-like materials in ceramic bodies varies with their content:


When the addition amount of talc-like materials is relatively low, generally 1% to 2% is added in daily-use porcelain, and 3% to 8% is added in ceramic wall and floor tiles. This can reduce the firing temperature. The liquid phase forms at a low temperature, accelerating the generation of mullite crystals and simultaneously improving the whiteness, mechanical properties and thermal stability of the product.

When a relatively large amount of talc (34% to 40%) is added, at the high-temperature stage, magnesium silicate in talc reacts with aluminum silicate in clay to form cordierite 2MgO2·2Al2O3·5SiO2. Its thermal expansion coefficient is only 2×10−6/°C to 3×10−6/°C, thus greatly improving the thermal stability of the product.

When the proportion of talc usage reaches 50% or more, enstatite MgO·SiO2 and cordierite formed by firing at around 1200°C can account for 30% to 50%. This product has high mechanical strength and thermal stability. Due to its large dielectric loss, it can be used as a high-frequency insulating material and materials requiring high mechanical strength and high insulation. When talc in the body accounts for 70% to 90%, the obtained product is called block talc product, mainly composed of enstatite crystals and can be used as a high-frequency and high-voltage insulating material in radio instruments.

When talc is used in ceramic bodies, enstatite is formed in the body, giving the entire body a relatively high expansion coefficient, causing the glaze layer to be under compressive stress, which can prevent glaze cracking, moisture absorption expansion of the body and late-stage crazing of the product glaze.

In the body formula of exterior wall bricks, using about 5% of talc-like materials as mineralizers can significantly reduce the firing tempera


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