Kinetics of Melting Loss and Evaporation Process of Cu-Zn Alloy

Two groups of Cu-43%Zn alloys were prepared by high temperature resistance furnace. The quality loss as well as phase transform law of Cu-Zn alloy in the process of melting under nitrogen and air atmosphere were studied by distillation method, X-ray diffraction (XRD), chemical analysis method, and the evaporation and vaporization process of Zn, low melting point alloy component, was revealed. Differential scanning calorimetry and thermogravimetric analysis (DSC-TGA) technology was used to investigate the evaporation, oxidation, vaporization and slagging behavior of Cu-Zn alloy in the atmosphere of nitrogen and air. Through analyzing the mass loss curve of sample and the content of Zn in the alloy matrix changing with temperature and time measured by distillation method and chemical analysis method, it was found that the sample quality and the content of Zn in the alloy matrix decreased with the increase of evaporation temperature and time; with certain temperature, the quality of sample and the content of Zn in the alloy matrix were reduced to a certain value; the higher the temperature, the less the quality of the sample and the content of Zn. The experimental results of DSC-TGA and Kissinger, Flynn-Wall-Ozawa equation showed that the average active energy of vaporization peak of Cu-Zn alloy was 5815.28 and 5107.05 kJ·mol^-1 separately under the atmosphere of nitrogen and air.