涂层厚度和填料含量对陶瓷前驱体基高辐射涂层性能影响

Influence of Coating Thickness and Filler Content on the High Emissivity Coating Performance

以氧化铈和碳化硼为高辐射填料,以陶瓷前驱体树脂为涂层成膜物,制备了不同厚度、不同填料体积含量的高辐射涂层,测试了涂层室温和1100 K发射率以及其抗热震性,研究了涂层厚度和填料体积含量对其发射率和抗热震性能影响。结果显示,该涂层发射率随涂层厚度的增加而迅速增加,然后趋于稳定,具有稳定发射率的最小涂层厚度约为50μm,涂层1100 K高温发射率≥0.90。填料体积含量50vol.%时,涂层高温下结构完整性好且抗氧化能力强,经过20次1100 K-室温的抗热震循环,涂层无剥离和脱落。

The high-emissivity coatings with different thickness and different filler volume percentage were prepared. The transition metal oxides and boron carbide were used as fillers, and the ceramic precursor resin was used as coating forming matter. The emissivity at room temperature and 1100 K and thermal shock performance were measured. The influences of coating thickness and filler volume percentage on the emissivity and thermal shock performance were studied. It was found that the coating emissivity increased quickly as the coating thickness increased, and then became steady. The minimum coating thickness with steady emissivity was about 50 μm, and the coating emissivity at 1100 K was not less than 0.90. The high emissivity coating with the fillers content of 50 vol.% has intact structure and good oxidation resistance at high temperature and no spalling after 20 times of thermal shock cycles from 1100 K to room temperature.