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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2026, Vol. 45 ›› Issue (4): 1335-1345.DOI: 10.16552/j.cnki.issn1001-1625.2025.0975

• Ceramics • Previous Articles     Next Articles

Preparation and Crystallization Kinetics Characterization of Red Oil Droplet Glaze

CHEN Dongli1,2(), WU Liaoxing1, WANG Haibo1,2   

  1. 1.School of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,China
    2.Sichuan Province Engineering Technology Research Center of Vanadium and Titanium Materials,Panzhihua 617000,China
  • Received:2025-10-04 Revised:2025-11-21 Online:2026-04-20 Published:2026-05-14

Abstract:

To implement the use of mineral resources from Panxi in ceramic glaze materials, this study successfully produced a red oil droplet glaze using kaolinite and vanadium-titanium magnetite from the Panxi region as raw materials through orthogonal and single-factor experimental optimization. The optimal process parameters are sintering at 1 250 ℃ with a holding time of 20 min. The resulting glaze surface exhibits round oil droplet patterns with a glossiness of 70.5 GU. XRD and Raman analysis confirm that the main crystalline phase in the glaze layer is α-Fe2O3, formed as a result of high-temperature oxidation of vanadium-titanium magnetite. The growth of oil droplets corresponds to the JMA kinetic model, with the highest rate constant (K=2.535) observed at a holding time of 20 min. After 30 min, the oil droplet coverage peak reaches 77.77%. The mechanism of firing mode control shows that an increase in temperature (1 240~1 260 ℃) promotes the growth of oil droplets, but exceeding 1 260 ℃ causes abnormal agglomeration due to a decrease in melt viscosity. Increasing the holding time (10~30 min) improves the uniformity of crystallization, but exceeding 30 min causes Ostwald ripening.

Key words: vanadium-titanium magnetite, red oil droplet glaze, colorimetric analysis, crystallization kinetics, JMA model

CLC Number: