Ceramic heat exchangers and production thereof.

摘要

A ceramic heat transmission type or regenerative heat exchanger (2) comprises a plurality of matrix segments (1) bonded together with a bonding material. Difference in coefficient of thermal expansion between the matrix segments (1) and the bonding material is not more than 0.02% at 800 DEG C, and a Young's modulus of the bonding material is not less than 0.4 time to not more than 1.8 times that of the matrix segment (1). A process for producing ceramic heat exchangers (2) comprises the steps of extruding and firing honeycomb structural segments in which a crystalline phase is mainly composed of cordierite and a coefficient of thermal expansion in an extending direction of flow channels is not more than 0.06% at 800 DEG C, machining an outer periphery of each of the segments (1), coating the bonding material around the outer periphery of each of the segments (1), bonding the segments (1) together, and drying and firing the bonded segments (1).