▎ 摘　　要

NOVELTY - Ceramic composite material comprises a matrix comprising a polymer-derived ceramic; one or more of substrates selected from: an ultra-high temperature ceramic (UHTC), carbon, an electrically-conductive material, magnetic-conductive material, and combination; and optionally, an oxide on surface of at least one of the substrates. The oxide is derived from the substrates. USE - The ceramic composite material is useful as microwave absorbing phase. ADVANTAGE - The fabricated nano composites have a significantly wide absorption bandwidth of 13.5 GHz covering the entire Ka-band (26.5-40 GHz) and a minimum reflection coefficient (RC) of -29.30 dB at a thickness as 1.26 mm. The properties are provided by the extensive nano interfaces introduced within the nano composites and the electrical conduction loss provided by the UHTC (ZrB2) nanoparticles. A series of tests provides a new solution in adjusting the electrical conductivity and designing high temperature microwave absorbing materials. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for forming a ceramic composite which involves: (a) providing a mixture comprising: (1) a liquid preceramic precursor, and (2) one or more substrates, where the one or more substrates is selected from a solid substrate, a liquid substrate, or both the solid substrate and the liquid substrate, where the solid substrates and liquid substrates are independently selected from UHTC, carbon, an electrically-conductive material, magnetic-conductive material, and combination, (b) heating the mixture at a temperature for a time effective to cure the liquid preceramic precursor to form a solid mixture; (c) optionally subjecting the solid mixture to one or more forces to form particles of the solid mixture; (d) optionally pressing the particles of the solid mixture into a mold having a pre-selected shape to form compacts of the solid mixture; and (e) pyrolyzing the solid mixture in step (b) or the compacts in step (d) or both at a temperature for a time effective to form the ceramic composite material.