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Pd—Eu合金在氧化性气氛中退火时,活性溶质Eu发生内氧化,形成稳定氧化物Eu_2O_3内氧化是由扩散机制控制的Eu_2O_3形核长大过程:氧通过体扩散和晶界扩散进入合金内,Eu由内层扩散到外层研究了内氧化动力学对于圆截面试样,内氧化层深度(ξ)与氧化时间(t)满足公式ξ=Kt~n当温度800—900℃时,n=0.5,符合抛物线规律;当温度高达1200℃时,n=0.75,偏离抛物线规律PdEu0.56合金在800—1200℃内氧化激活能为150kJ/mol
When the Pd-Eu alloy is annealed in an oxidizing atmosphere, the active solute Eu undergoes internal oxidation to form a stable oxide. The internal oxidation of Eu_2O_3 is controlled by the diffusion mechanism. Nucleation and growth of Eu_2O_3: Oxygen enters the alloy through the bulk diffusion and the grain boundary diffusion , Eu from the inner layer to the outer layer of the study of the internal oxidation kinetics for the circular cross-section sample, the depth of the inner oxide layer (ξ) and oxidation time (t) to meet the formula ξ = Kt ~ n when the temperature 800-900 ℃, n = 0.5, consistent with the law of parabola; when the temperature is up to 1200 ℃, n = 0.75, deviation from the parabolic law PdEu0.56 oxidation activation energy at 800-1200 ℃ within 150kJ / mol