Method for producing an open-pored metal body having an oxide layer and metal body produced by said method

A process for producing an open-pored metal body, coating the surface of an open-pored semifinished part forming the core layer and consisting of Ni, Co, Fe, Cu, Ag or an alloy comprising one of these chemical elements, where one of these chemical elements is present in a proportion of more than 40 at % in the alloy, with pure aluminum powder or a powder of an aluminum alloy in which aluminum is present in a proportion of at least 40 at %;

• forming a gradated layer which comprises intermetallic phase or mixed crystals of Al on the surface of the open-pored semifinished part in a first heat treatment;
• and forming an aluminum oxide layer composed of pure α-Al2O3 phase under oxidizing conditions from Al on the gradated layer in a subsequent second heat treatment of a temperature of at least 1200° C.