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Kinetics of Opacification of a TiO 2 ‐Opacified Cover Coat Enamel

1967; Wiley; Volume: 50; Issue: 3 Linguagem: Inglês

10.1111/j.1151-2916.1967.tb15067.x

1551-2916

Richard A. Eppler, W. A. McLERAN,

Pigment Synthesis and Properties

Quantitative X‐ray diffraction measurements were used to study the firing behavior of a typical TiO 2 ‐opacified cover coat enamel. A model was developed for predicting the anatase and rutile concentrations as a function of time and temperature of firing. The model consists of three first order reactions: crystallization of anatase, crystallization of rutile, and inversion of anatase to rutile. It predicts successfully over a wide range of time‐temperature conditions. Discrepancies are found, however, for short‐time, low‐temperature firings. The reflectance data do not correlate well with the crystalline concentration data. The correlation with color data is better, but is not perfect.