Fabrication of Oxide Nano-Rod Array Structures via Internal Oxidation of Alloys
A simple metallurgical process for fabricating oxide nano-rod array structures via internal oxidation is described. Some dilute alloys such as Ni(Al) and Fe(Al) solid solutions develop rod-like oxide precipitates after their internal oxidation at high-temperatures and under low oxygen partial pressures. The oxide nano-rod array structure can be developed on the metal substrate by removing the metallic matrix of the internal oxidation zone. Al2O3 or MAl2O4 (M=Ni or Fe) spinel nano-rod array structures were prepared by using M(Al) solid solutions. Pack cementation process to develop M(Al) solid solution surface layers was used for the fabrication of nano-rod array structures on substrates with desired shape. Near-net shape Ni substrates with oxide nano-rod array structures on their surfaces can be prepared by using pack cementation and internal oxidation.
Toshio Maruyama, Masayuki Yoshiba, Kazuya Kurokawa, Yuuzou Kawahara and Nobuo Otsuka
M. Nanko "Fabrication of Oxide Nano-Rod Array Structures via Internal Oxidation of Alloys", Materials Science Forum, Vol. 696, pp. 348-353, 2011