Estudo de super-resfriamento de ligas Cu-O pela técnica de fusão em presença de fluxo.

Abstract

This paper presents a study on the supercooling of pure copper and copper-oxygen alloys by the method of elimination of heterogeneous nucleation catalytic sites by the flux presence fusion technique. The method was efficient leading to obtaining samples with high degrees of supercooling, and the maximum values were 254 degrees and 264 degrees for pure copper and alloy with 1360 ppm oxygen respectively. The flow type has a great influence on the efficiency of the method, and commercial glass was much more efficient than B2O3. Another parameter was the heating-cooling cycles. The grain size refining was only verified in the alloys, reaching an average grain size of 50um.