Ceramic connecting piece with high temperature resistance and radiation resistance as well as preparation method and application of ceramic connecting piece

The invention belongs to the technical field of ceramic connection, and discloses a ceramic connecting piece with high temperature resistance and radiation resistance as well as a preparation method and application of the ceramic connecting piece. The method comprises the following steps: coating carbon powder on the surfaces to be connected of reactive sintering SiC (RB-SiC) ceramic pretreated at 800-1800 DEG C, and attaching the surfaces to be connected coated with carbon powder layers in pairs to obtain a prefabricated connecting piece; and heating the prefabricated connecting piece to 1500-1800 DEG C in a protective atmosphere or vacuum, and carrying out heat preservation to obtain the ceramic connecting piece. The ceramic connecting piece has good radiation resistance and high temperature resistance, the shearing strength at the room temperature is 150-230 MPa, the shearing strength at the temperature of 1200-1300 DEG C is 100-150 MPa, and the swelling rate lt of a connector after neutron radiation of 10