陶瓷前驱体基高温高辐射涂层制备及表征

Preparation and Characterization of Ceramic Precursor Based High-Temperature High Emissivity Coatings

以陶瓷前驱体树脂为成膜物,以过渡金属氧化物和硼化物为填料,采用空气喷涂工艺在镍基高温合金和C/C基材上制备出了高温散热性能好、抗热震性好的高温高辐射涂层,并用DSC-TG、光学显微镜和风洞对涂层性能进行表征。结果表明：该涂层室温-827℃发射率达到0.85-0.92,827℃-室温抗热震循环20次后涂层不剥离、不脱落;该涂层在290 k W/m2冷壁热流、300 s时长的风洞考核条件下,可将镍基高温合金基材温度从686℃降到646℃,降温40℃。

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 forming matter and transition metal oxides and borides as high emissivity fillers. The high emissivity coatings were characterized by DSC- TG,optical microscope,and wind tunnel. The emissivity of the high emissivity coating is 0. 85 to0. 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℃.