کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1622929 | 1516405 | 2009 | 8 صفحه PDF | دانلود رایگان |
In this paper, the effect of alloy composition on the formation of porous Ni catalysts prepared by chemical dealloying of rapidly solidified Al–Ni alloys has been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis and N2 adsorption experiments. The experimental results show that rapid solidification and alloy composition have a significant effect on the phase constituent and microstructure of Al–Ni alloys. The melt spun Al–20 at.% Ni alloy consists of α-Al, NiAl3 and Ni2Al3, while the melt spun Al–25 and 31.5 at.% Ni alloys comprise NiAl3 and Ni2Al3. Moreover, the formation and microstructure of the porous Ni catalysts are dependent upon the composition of the melt spun Al–Ni alloys. The morphology and size of Ni particles in the Ni catalysts inherit from those of grains in the melt spun Al–Ni alloys. Rapid solidification can extend the alloy composition of Al–Ni alloys suitable for preparation of the Ni catalysts, and obviously accelerate the dealloying process of the Al–Ni alloys.
Journal: Journal of Alloys and Compounds - Volume 472, Issues 1–2, 20 March 2009, Pages 71–78