THERMAL PROPERTIES INVESTIGATION CLOSE TO LIQUID PHASE IN THE Ni-Sn-Zn TERNARY SYSTEM

摘要

The Sn-Zn eutectic alloys with small addition of Ni were studied experimentally as part of the ternary Ni-Sn-Zn system. It was found that small amount of Ni in the liquid phase decreased the eutectic temperature and ternary eutectic temperature ap-pearred. The binary and the ternary eutectic temperatures were determined by DTA. The chemical compositions of the samples were studied with scanning electron microscope. Unidentified dendrites appeared in the solid phase when small amount of nickel was added. In addition, the thermal and thermodynamic properties as specific heat capacity, the coefficient of conductivity and thermal diffusivity, the enthalpy, entropy and Gibbs free energy were determined.