Research and Preparation of Lead-Free Low-Melting Point Glass  for Automobile Glass Enamel

Abstract

Abstract: In this study, R₂O-Bi₂O₃-B₂O₃-SiO₂ lead-free low-melting point glass was prepared by high temperature melting method and applied to automobile glass enamel. The effect of composition on the structure, thermal properties and acid resistance of glass was studied. The results show that with the increase of Bi₂O₃/B₂O₃ and Bi₂O₃/SiO₂, the [BO₃] and [BiO₃] triangular structural units gradually decrease, the [SiO₄] and [BO₄] tetrahedral structural units gradually increase, and the network structure of glass is enhanced. When the alkali metal oxide content is 15% (mole fraction), the thermal expansion coefficient α_{25~320 ℃}, transition temperature T_g and softening temperature T_f of double alkali glass are smaller than those of single alkali glass, and the acid mass loss rate D_r is lower. When n(Li₂O)∶n(Na₂O) is 1∶1, the α_{25~320 ℃} of double alkali glass is 9.35×10^-6 ℃^-1, the T_g value is reduced to 439.8 ℃, the T_f value is 481.7 ℃, and the D_r value is 0.006 70 g/cm². Applying it to automotive glass enamel, the sintered enamel has good adhesion, blackness, coverage and gloss.

Key words: R₂O-Bi₂O₃-B₂O₃-SiO₂ glass, lead-free low-melting point glass, structure, thermal property, acid resistance, automotive glass enamel

CLC Number:

TQ171.1

ZHAO Tiangui, LIU Kun, LIU Li, DONG Weixia, BAO Qifu, XU Heliang, ZHOU Jian'er. Research and Preparation of Lead-Free Low-Melting Point Glass for Automobile Glass Enamel[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2936-2944.

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Research and Preparation of Lead-Free Low-Melting Point Glass for Automobile Glass Enamel

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