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Interdiffusion in the Pt/ β-NiAl System

机译:Pt /β-NiAl系统中的相互扩散

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摘要

Interdiffusion in Pt/β-NiAl diffusion couples at 1073-1273 K temperature range was investigated. Using the Inverse Method and the Generalized Darken's Method the intrinsic diffusivities of platinum, nickel and aluminium in the Pt-Ni-AI system have been calculated allowing the estimation of the activation energies and pre-exponential factors for Pt, Ni and Al diffusion have been obtained. In a whole range of temperatures at 1073-1273 K the intrinsic diffusivity of the aluminium is approximately one order of magnitude higher that the apparent diffusivities of nickel and platinum. These results confirm the earlier assumption that enhanced diffusion of aluminium is a limiting factor in conferring very good corrosion resistant properties to platinum-aluminide coatings on nickel base superalloys.
机译:研究了Pt /β-NiAl扩散对在1073-1273 K温度范围内的相互扩散。使用逆方法和广义变暗法,计算了Pt-Ni-AI系统中铂,镍和铝的固有扩散率,从而可以估算出Pt,Ni和Al扩散的活化能和预指数因子。获得。在1073-1273 K的整个温度范围内,铝的固有扩散率比镍和铂的表观扩散率高大约一个数量级。这些结果证实了较早的假设,即铝的扩散增加是赋予镍基高温合金上的铝铂涂层非常好的耐蚀性能的限制因素。

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