To bond two components of a sintered and non-oxide ceramic material, they are joined together by diffusion welding in a hot press in a protective gas atmosphere. They are heated to a temperature of at least 1600 [deg] C, preferably >= 1800 [deg] C and especially >= 2000 [deg] C. They are pressed together with a low distortion into a monolith, with a plastic distortion towards the application of force of = 5% and preferably = 1%.