(Invited) Investigation of High Temperature Oxide Scale Using Chemical Reactor

Abstract

Ni-Al and Ni-Al-Cr alloys generate hydrogen by oxidizing in an atmosphere containing water vapor. The generated hydrogen was measured by using a gas sensor, which has a different principle as a hydrogen sensor and an oxygen pump sensor. The oxygen pump sensor is called a chemical reactor because it reacts the supplied oxygen with hydrogen. The oxidation rate was calculated from the amount of generated hydrogen, and the transformation behavior of the oxide was clarified during the temperature rise process. Furthermore, the relationship between the oxidation rate and cross-sectional structure was clarified.