The Effect of CaCO₃ Addition on Physical Properties of ZnO-Based Crystal Glaze

Abstract:

The effects of calcium carbonate (CaCO₃) addition on the physical properties of ZnO-based crystal glaze batches were investigated. Samples were fired at different gloss firing temperatures ranging from 1180-1220°C with 3 hours soaking at 1060°C crystallization temperature. X-ray diffraction (XRD) analysis identifiedthe crystal phase occurred as willemite (Zn₂SiO₄) and the scanning electron microscope (SEM) analysis indicated that willemite crystals are in the acicular needle like shape that formed spherulite. The intensities of willemite peaks decreased with CaCO₃ addition and completely vanished at 5.0 wt% CaCO₃. Varied formation of spherulites developed of the surface of crystal glaze as the flows of the glaze stretched further as the amount of CaCO₃ increased.

• Periodical: Advanced Materials Research (Volume 620)
• Pages: 12-16
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.620.12
• Online since: December 2012
• Authors: Abdul Rashid Jamaludin, Shah Rizal Kasim, Zainal Arifin Ahmad
• Keywords: Calcium Carbonate, Crystallization Temperature, Gloss Firing Temperatures, Spherulite, Willemite

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