Melting Behavior of Low-Temperature Enamel Coating at Different Heating Rates

Abstract

Abstract: Low temperature enamel (LTE) coating is a new type of inorganic coating developed for metal surface corrosion protection. Understanding melting behavior of LTE coating during sintering process assist in the control of sintering technology, and produce a fully covering and smooth coating. Mass and heat changes of LTE coating powder during sintering process were investigated using synchronous thermal analyzer. Glass transition temperature and thermal expansion coefficient of LTE coating cyclinder sample were measured using thermal mechanical analyzer. Under different heating rates, changes of viscosity, height, volume with contact angle of LTE coating cyclinder sample were studied using self-made hot-stage microscope. Results show that with the increase of heating rate, sintering temperature, softening temperature, and spherical temperature of LTE coating cyclinder sample decrease. The viscosity is also reduced, which is benefical for coating leveling, suggesting that the 20 ℃/min heating rate is optimum. Height and contact angle of LTE coating cylinder sample begin to enter plateau at the temperature range of 530~550 ℃, indicating that this temperature range should be chosen as the sintering temperature of LTE coating.

Key words: LTE coating, heating rate, viscosity, sintering temperature, characteristic temperature, contact angle

CLC Number:

TG174.4

GUO Peng, YE Shenhao, MAO Jiaxi, QIAN Hao, LIU Yi, YAN Dongming. Melting Behavior of Low-Temperature Enamel Coating at Different Heating Rates[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2881-2887.

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