Water resistance improvement of lead-free jewelry enamel

Authors

DOI:

https://doi.org/10.15587/2312-8372.2016.76516

Keywords:

jewelry enamel, lead-free enamel, water resistance, refractive index of the glass, gold, silver, copper

Abstract

Glass research in the system SiO2–Na2O–B2O3–+BaO+K2O–Al2O3–TiO2–ZnO to produce lead-free glass coatings on copper samples is conducted. The influence of oxides Al2O3, TiO2, ZnO on the properties of glass and enamels based on it is studied.

The glass of second hydrolytic class was obtained at the ratio of Al2O3:TiO2:ZnO is 1:6:6.

TiO2 increases the refractive index and water resistance, but reduces the coefficient of linear expansion.

Al2O3 improves water resistance and refractive index of the investigated glass. However, increasing the Al2O3 content up to 10 mol. % reduces the coefficient of linear expansion and gloss of coating, which is undesirable in the development of jewelry enamel.

Increase of ZnO content of the base glass increases the water resistance and refractive index. Addition of zinc oxide does not change the coefficient of linear expansion and original glass-fusion point. Therefore, addition of ZnO to jewelry enamel compositions has a positive impact on technological and decorative properties and is a promising addition.

Area of rational enamel compositions for coating of gold, silver and copper has the following limitations of oxide content, mol. %: Al2O3 – 1,0-3,0; TiO2 – 1,0-5,0 and ZnO – 5,0-10,0.

Clear, defect-free, smooth, uniform enamel layer having rational firing temperature of 800 °C and the firing duration of 3 minutes is obtained on copper samples 1 mm thick (copper marks M1).

Author Biographies

Ольга Петрівна Рижова, Ukrainian State University of Chemical Technology, Gagarina 8, Dnipro, Ukraine, 49005

Candidate of Technical Science, Associate Professor

Department of chemical technology of ceramics and glass

Ольга Борисівна Гуржій, Ukrainian State University of Chemical Technology, Gagarina 8, Dnipro, Ukraine, 49005

PhD student

Department of chemical technology of ceramics and glass

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Published

2016-07-26

How to Cite

Рижова, О. П., & Гуржій, О. Б. (2016). Water resistance improvement of lead-free jewelry enamel. Technology Audit and Production Reserves, 4(4(30), 7–13. https://doi.org/10.15587/2312-8372.2016.76516

Issue

Vol. 4 No. 4(30) (2016): Technologies of food, light and chemical industry

Section

Technologies of food, light and chemical industry

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Copyright (c) 2016 Ольга Борисівна Гуржій, Ольга Петрівна Рижова

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