Method for producing a porous metallic or ceramic component and component produced using the method

A method for producing a porous metallic and/or ceramic component, which comprises at least three mutually adjoining volume regions having differing porosities, in which

• an open-pored foam body, which is formed of a polymeric material, is provided with a metallic coating or a coating formed with metallic or ceramic particles at the surfaces of struts of the foam body in such a way that an open-pored base structure is preserved to form a semi-finished product;
• and
• a suspension, which is formed with metallic or ceramic particles, a liquid, a polymeric binder and additionally previously formed gas bubbles is brought in contact with the surface of the semi-finished product, creating a predefined shape at predefined surface regions of the semi-finished product, with a portion of this suspension penetrating the open pores of the semi-finished product, in an edge layer region;
• and
• thereafter, a drying process using a thermal treatment is carried out, during which liquid contained in the suspension is expelled, the polymeric binder is removed, and subsequently a sintering process is carried out, wherein
• during sintering, a first volume region being formed with the metallic or ceramic particles originating from the suspension, which has a smaller porosity that was exclusively obtained as a result of the gas bubbles present in the suspension, and, adjoining this first volume region, a second volume region is created, which is likewise porous, and the second volume region has been formed with the metallic or ceramic particles from the coating of the struts of the semi-finished product and the metallic or ceramic particles of the suspension, these metallic or ceramic particles having been joined to one another integrally and in a form-fitting manner within the second volume region, and thereby the second volume region being joined to a metallic or ceramic open-pored structure of an open-pored third volume region that was obtained from the coated foam body and has a larger porosity than the first volume region.