C/C复合材料航空刹车副表面防氧化涂料的研制

以磷酸，磷酸盐，ＳｉＣ，ＳｉＯ２，Ｂ４Ｃ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９００℃氧化１０ｈ后，其氧化损失率为１０．３７％；试样在空气中９００℃，３ｍｉｎ＝室温，２ｍｉｎ急冷急热，如此在１０ｈ内循环１００次后，氧化损失率为８．４１％，涂层与基体结合牢固

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

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.