Reaction mechanism and oxidation resistance at 700–900 °C of high porosity NiAl intermetallic

Abstract

Porous NiAl intermetallic compound exhibit attractive properties. However, their simple and controllable preparation and understanding of oxidation mechanism are still incipient. Thermal explosion was employed to facilely fabricated highly porosity NiAl. The pore structure of the product has been meticulously characterized using 3D-XRM, and oxidation corrosion test was conducted in a fluid and static air at 700–900 °C for up to 120 h. Dynamic oxidation shows that 800 °C is the turning point of oxidation mechanism. The oxidation of porous NiAl follows the logarithmic oxidation law below 800 °C and the parabolic oxidation law above 800 °C.