Formation of Al2O3 scale on low-Al heat resistant alloys by increasing aluminum outward diffusion flux

在1150℃空气中氧化几种具有不同金属镀层（-100nm）的Ni-low Al合金。在本研究使用的涂层元素中，经过优化热处理的薄Pt涂层促进了Ni-14at%Al合金上Al_2O_3结垢的形成。热处理后Al发生了上坡向外扩散，认为这种向外扩散是导致Ni-low Al合金表面Al_2O_3垢形成的原因。

Several Ni-low Al alloys with various metal coatings (-100nm) were oxidized at 1150℃ in air. Among the coating elements used in the present study, a thin Pt coating with the optimized heating treatment promoted the formation of Al_2O_3 scale on the Ni-14at%Al alloy. Al uphill outward diffusion was confirmed to occur after the heat treatment, and this Al outward diffusion was considered to cause the formation of Al_2O_3 scale on the Ni-low Al alloys.