Розробка складів безсвинцевих емалей для виробів із золота, срібла та міді

Abstract

In this work the results of glasses in the system Na₂O – BaO – B₂O₃ – SiO₂ research are represented. Technological parameters of their manufacture in the researched field of the examined system are considered. The peculiarities of manufacturing enamel coatings on cuprous sam ples with the requirements for jewel and jewel-like enamels taken into account are expounded. By experimental means, basic physical and chemical properties of the researched glasses are detected. The influence of BaO in the quantity of 5 mol. % and 10 mol. % on glass frit properties is examined. Data received helped elaborate mathematical models fit to "content-property" relation. Lead-free enamel providing defect-free, glib and transparent glass cover with high level of glance on the cuprous samples with burning temperature of 800 °C is synthesized. The elaborated enamel can be used as base glass for manufacturing painted coatings of decorative purposes on silver, gold and cooper. Principal possibility of manufacturing low-temperature enamel with high chemical resistance without using lead-bearing upstream material is demonstrated. Such studies allow to solve economic, and environmental problems due to the exclusion from the composition of toxic, scarce and expensive lead compounds. Designed enamels can be app lied to gold and silver.