Process for producing a high-temperature-resistant composite body

A process for producing a high-temperature-resistant composite body, the process comprising:

• A) producing a first assembly of a first, nonmetallic section, a first Zr solder, and an intermediate layer in sequence, the intermediate layer being formed to at least 90 atom % of one or more of the elements selected from the group consisting of Ta, Nb, and W;
• B) heating the first assembly in a first soldering step to melt the Zr solder but not the intermediate layer and to obtain a partial composite body;
• C) producing a second assembly of the partial composite body, a second solder adjoining the intermediate layer of the partial composite body and a second, metallic section in sequence, where the second section is composed of a metal selected from the group consisting of Mo, a Mo-based alloy, W, and a W-based alloy, and where the second solder is formed by precisely one material selected from the group consisting of Ti, a Ti-based solder combination, a V-based solder combination, Zr and a Zr-based solder combination, and the second solder configured to melt at a lower temperature than the first Zr solder in the second assembly;
• and
• D) heating the second assembly in a second soldering step to melt the second solder but not the soldered bond obtained from the first Zr solder;
• to areally join the first, nonmetallic section via the bonding solder layer to the second, metallic section and to form the high-temperature-resistant composite body.