Potclays Silicon Carbide Cuts Oxidation in Ceramic Glazes

Ceramic artists have long sought ways to achieve stunning reduction effects while working within the limitations of oxidation firing atmospheres. A breakthrough solution has now emerged with Potclays' introduction of a finely ground 200-mesh silicon carbide (SiC) material specifically designed for ceramic glaze formulations.

This specialized product, designated as model 3457, serves as a localized reducing agent that creates effects typically associated with traditional reduction firing, even in electric kilns operating under oxidation conditions. The material's unique chemical properties allow for unexpected color variations and textural qualities in finished ceramic works.

During high-temperature firing, the silicon carbide decomposes and releases carbon elements. These carbon particles react with metal oxides present in the glaze, effectively removing oxygen and reducing the oxidation state of metallic compounds. This localized reduction process produces rich color gradations and distinctive metallic luster, significantly enhancing the artistic appeal of ceramic pieces.

• Consistent particle size for uniform effects: The 200-mesh granulation ensures even distribution throughout the glaze, enabling controlled and predictable reduction without localized over- or under-reduction.
• High purity for reliable results: With a purity level of 97.6% and minimal impurities, the material avoids unwanted chemical interactions that could compromise glaze stability and predictability.
• User-friendly application: The additive integrates seamlessly with existing glaze formulas without requiring changes to standard firing protocols, while maintaining safe handling characteristics under normal use conditions.

The chemical composition of Potclays 200-mesh silicon carbide includes:

• Silicon carbide (SiC): 97.6%
• Silicon dioxide (SiO2): 0.60%
• Silicon (Si): 0.80%
• Iron (Fe): 0.20%
• Aluminum (Al): 0.30%
• Carbon (C): 0.50%

These precise chemical ratios ensure consistent performance and control, providing ceramic artists with reliable creative tools.

• Historical reproduction ceramics: Enables accurate recreation of traditional glaze colors and textures found in antique pottery.
• Art ceramics: Facilitates unique chromatic variations and surface qualities that enhance artistic expression.
• Specialty ceramics: Combines effectively with other colorants and additives to produce distinctive commercial products.

While this silicon carbide product offers significant advantages as a glaze additive, manufacturers emphasize that it should not be used as an abrasive material, as its primary function involves chemical reduction rather than mechanical grinding.

This innovative material provides ceramic artists with new creative possibilities, allowing them to achieve reduction-style effects in oxidation firing environments. The development represents both an artistic breakthrough and a technological advancement for the ceramics industry.