Abstract: A method for producing dimensionally accurate metal foam from a foamable, powder metallurgically produced metal semifinished product having a melting point >200° C. involving: the introduction of material, which is capable of foaming above 200 ° C., into a mold which has a coefficient of expansion of less than 3 K?1 Controlled heating of the foamable material inside the mold is performed while radiators foam the material, and the foamed product formed thereby removed from the mold. A device for producing dimensionally accurate thermally foamed metal foam parts that is has a thin-walled mold, which is stable at the melting temperature of the metal foam and which has a coefficient of expansion of <3K?1; a controllable irradiating device, and; a controller that controls the irradiating device based on the measurement given by a radiation measuring device.

Abstract: A method for producing dimensionally accurate metal foam from a foamable, powder metallurgically produced metal semifinished product having a melting point >200° C. involving: the introduction of material, which is capable of foaming above 200 ° C., into a mold which has a coefficient of expansion of less than 3 K?1 Controlled heating of the foamable material inside the mold is performed while radiators foam the material, and the foamed product formed thereby removed from the mold. A device for producing dimensionally accurate thermally foamed metal foam parts that is has a thin-walled mold, which is stable at the melting temperature of the metal foam and which has a coefficient of expansion of <3K?1; a controllable irradiating device, and; a controller that controls the irradiating device based on the measurement given by a radiation measuring device.

Abstract: A method for joining a ceramic component to a metal component by brazing where the outer edge of the joining surface on the ceramic component (1) is provided with a chamfer (3) with a chamfer angle (.alpha.) of 15.degree.-45.degree.. The chamfer (3) has an edge radius of .ltoreq.0.3 mm and its minimum height (H) is to be 5-30% of the wall thickness (W) of the ceramic component (1). The joining surface, including its chamfer, is provided with a metallizing layer.

Abstract: A ceramic sealing component for a machine which is in frictional contact and has at least one non-reflective sliding and sealing face of a mean roughness (Ra) greater than 0.1 and a minimum of 0.8 .mu.m is described. A component of this type can be produced by subjecting a green ceramic article to shaping, sintering, processing by face-grinding or round-grounding, optionally washing and then abrasive-polishing in the presence of an aqueous phase until the mean roughness desired for the machine component is reached.