Oxidation Of Amorphous Alloys Research Articles

Oxidation of amorphous alloys

Owing to their unique short- or medium-range ordered microstructures and excellent mechanical, physical, and chemical properties, amorphous alloys have attracted significant interest in recent years. For the application of amorphous alloys, clarifying their oxidation processes and mechanisms is necessary since many of the surface-related properties of amorphous alloys largely depend on the surface oxide layer. The aim of this paper is to review the recent research on the thermal oxidation behaviors of amorphous alloys under pure oxygen or air condition. The contents are divided into three categories according to the number of components the research considers, i.e., the oxidation of binary, ternary, and multi-component (>3) amorphous alloys. Each section discusses the thermal stability of the amorphous matrix, oxidation kinetics, and the oxide layer and amorphous substrate, which are strongly affected by internal factors (i.e., alloy elements and microstructure) and external factors (i.e., oxidation temperature, duration, and oxygen partial pressure, etc.). The general features of the oxidation of amorphous alloys – from simple binary to complex multi-component amorphous alloys – will be summarized. This overview of the current scientific understanding on the fundamentals of these materials may provide guidelines for the development of strongly corrosion-resistant amorphous alloys.

Activation of amorphous CuZr alloys

In a previous paper, the authors described the process of activation of Cu-Zr amorphous alloys from the results of a high-pressure DTA in various gas atmospheres and X-ray diffraction. In this paper, the authors carried out CO hydrogenation over several samples containing zirconium and estimated the oxidation and the increase in the surface area of an amorphous Cu-Zr alloy during the activation process as a function of duration time under various atmospheres. Then it was found that the presence of water drastically promoted the oxidation and the increase in the surface area of an amorphous Cu-Zr alloy. The in situ oxidation and oxidation with water of amorphous alloys containing zirconium make active catalysts from amorphous alloys. The oxidation of amorphous alloys provides a new way of preparing supported catalysts. 12 references.