| Abstract Scope |
High-temperature heat exchangers require stringent properties to keep up with high power demands. The requirements for these high-temperature heat exchanger materials call for high thermal conductivity (>50 W/mK), high resistance to fracture (>10 MPa√m), high resistance to creep deformation (100,000 hr), environmental stability in environments associated with the application (< 20 µm/hr), and high modulus of elasticity (>400 GPa) while maintaining low cost to make and maintain. Historically, high-temperature heat exchangers made from ceramics have been used, but the geometries are limited. We provide examples of ceramics in relevant heat exchange applications and provide motivation where additive manufacturing (AM) can improve efficiency. Developing manufacturing techniques for materials like AlN, Si3N4 and SiC in near net shape becomes important. We provide a framework for material and manufacturing selection for high-temperature heat exchangers for AM to keep up with the demand for better efficiency, better material, better manufacturing, and cost. |