Two-dimensional transition metal carbide (MXene) has excellent electromagnetic interference(EMI) shielding performance due to its good electrical conductivity,but its high temperature instability hinders its application as a structural EMI shielding material in the aeronautic and astronautic field. In this paper, a new type of sandwich structured MXene/CaF2 material was prepared by in-situ reaction method,and the MXene/CaF2 powder was thermally reduced under the condition of H2 using a tube furnace to improve the high temperature stability. The the MXene/CaF2 ceramic composites densified by SPS show high EMI shielding performance and strength. In particular, the MXene/CaF2, composite ceramic material prepared by 0.02 molCaF2, sintered at 700℃ shows the most excellent performance. The EMI shielding effectiveness reaches 37dB in the entire X-band. Meanwhile, the bending strength measured by MSP method and Vickers hardness reach 142 MPa and 1.66 GPa, respectively. Therefore, MXene/CaF2. composites are expected to be used as a high-temperature EMl shielding material with good mechanical properties. |