C/C复合材料航空刹车副表面防氧化涂料的研制

Preparation of oxidation resistant coatings for carbon carbon composites aircraft brake pairs

以磷酸 ,磷酸盐 ,SiC ,SiO2 ,B4 C和含硼化合物等为原料研制了以硅、硼化合物为主的多组分陶瓷混合物涂料。采用该涂料以刷涂的方式制备的C/C复合材料复合涂层具有显著的防氧化效果。研究表明 ,涂覆有涂层的C/C复合材料试样在 90 0℃氧化 10h后 ,其氧化损失率为 10 .37% ;试样在空气中 90 0℃ ,3min 室温 ,2min急冷急热 ,如此在 10h内循环 10 0次后 ,氧化损失率为 8.41%。涂层与基体结合牢固 ,一直保持完好 ,没有发生剥落 ,具有耐高温、热稳定性好、耐腐蚀的优点 ,没有烧损和大量蒸发等现象 。

Multi layer coatings with oxidation resistance made of ceramic mixtures of phosphate, SiC,SiO 2, B 4C and borate on carbon carbon composites surface were proved effective in oxidation resistance. Fabrication techniques, microstructure and oxidation resistance of coated carbon carbon composites were studied. Results show that carbon carbon composites with multi layer coatings lose only 10.37% of mass after being oxidized in air at 1 173 K for 10 h. Oxidation mass loss rate is 8.41% after being thermally circulated in air from 1 173 K, 3 min to room temperature, 2 min and from room temperature, 2 min to 1 173 K, 3 min in 10 h for 100 times, which indicates that the multi layer coatings can provide excellent oxidation resistance and thermal shock resistance and be applied to the oxidation proof of carbon carbon composites aircraft brake pairs. [