Ceramic components are often exposed to extreme thermal loads. Due to their construction or function, these components often consist of different ceramics or metal components. In particular, the use of multi-material systems in high-temperature applications requires new, thermally stable joints that are individually adapted to the materials and application parameters. In addition, there are applications where the ceramic composites are exposed to abrasive, chemical or mechanical loads. With these tasks in mind, we develop individual solutions for joining ceramic composites. For this purpose, we use or modify commercial solders and adhesives. For applications where commercial solutions do not meet the requirements, we develop new brazing materials and joining technologies including diffusion joining concepts.