Preparation and characterization of low-melting glasses used as binder for protective coating of steel slab

Abstract

The low-melting phosphate glass was prepared for production of glass binders for protective coating of steel slab. Effects of different O/P ratios on glass structures and properties were analyzed. Differential thermal analysis (DTA) and infrared spectroscopy (IR) techniques were applied for low-melting glass binder. It was found that the glass transition temperature(T _g) was about 300 °C and softening temperature(T _f) was about 480 °C. The choice of O/P ratio was very important to the glass transition and softening temperatures. When more P=O bonds existed in the glass networks, P-O-P bond angle was deformed with decreasing of the ratio of O/P. The coatings could adhere to the substrates instantaneously at 800 °C when the content of binder exceeded 3wt%. The optimal content of glass binder was 5wt%.

Keywords

low-melting glasses / binders / steel slab / protective coating

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