Ceramics-Silikáty 49 (4) 283-286 (2005)

THE STUDY OF COPPER RUBY GLASS

C. Câpâţînâ

The tendency of removing Cd from the production of red glasses comes from its toxicity. One of the alternatives is the copper ruby glass, but in this case, the formation of colloidal aggregates of CuO demands the use of efficient reductants. The paper focuses the development of copper ruby glass in the presence of Cu–Sn alloy. The study deals with the effect of melting temperature, holding time, and a subsequent heat treatment on the formation of CuO aggregates. The measurement of spectral transmission of prepared glasses showed that increasing melting temperature and holding time bring more intensive glass color indicated by an increase in the amplitude of the absorption maximum. Subsequent heat treatment of glass samples in the temperature interval 530-570°C makes an increase of absorption maximum with increasing temperature. Prolonged time of heat treatment at 570°C brings more intensive color up to 90 minutes. During longer heating the oxidation of CuO prevails, which leads to the color degradation.

Keywords: Copper ruby, Alloy, Melting, Red color