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The internal oxidation behavior of Pd-40Ag-1RE(RE=Sin,Eu,Gd,Y)alloy wires has been studied in air at 800～1200℃The dependence of internal oxidation depth ξ on reaction time t can be expressed asξ=Kt~n,the reaction index n=0.50～0.75.The higher the oxidation temperature is.the larger the n value is.It means that the internal oxidation of wire sampls at high tem-perature deviates from parabola rule observed on plate sample.The activation energies of the studied alloys range over 120～160kJ/mol.The internal,oxidation process is controlled by the bulk diffusion of oxygen.
The internal oxidation behavior of Pd-40Ag-1RE (RE = Sin, Eu, Gd, Y) alloy wires has been studied in air at 800 ~ 1200 ℃. The dependence of internal oxidation depth ξ on reaction time t can expressed as ξ = Kt ~ n, the reaction index n = 0.50 ~ 0.75. The higher the oxidation temperature is. the larger the n value is. It means that the internal oxidation of wire sampls at high tem-perature deviates from parabola rule observed on plate sample. activation energies of the studied alloys range over 120 ~ 160kJ / mol.The internal, oxidation process is controlled by the bulk diffusion of oxygen.