The high emissivity coatings on the nicke-based alloy and C/ C composite, with good radiating ability
and good thermal shock resistance ability, were prepared by air spray, using ceramic precursor resin as coating form-
ing matter and transition metal oxides and borides as high emissivity fillers. The high emissivity coatings were charac-
terized by DSC-TG, optical microscope, and wind tunnel. The emissivity of the high emissivity coating is 0. 85 to
0． 92 between room temperature and 827℃. The high emissivity coating has no spalling after thermal shock resistance
measurement of 20 times between 827℃ and room temperature. The high emissivity coating on the nickel-based alloy
can make the temperature of the nickel-based alloy decrease from 686 to 646℃, decreasing by 40℃.