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采用液态磷酸盐浸渍及不同的热处理技术在C/C复合材料表面制备抗氧化涂层。实验结果表明:采用1～2°C/min慢速冷却制备的材料A在700°C氧化20 h后的氧化质量损失达到47%,而采用快速气冷技术制备的材料B的氧化质量损失仅仅为0.98%。SEM形貌观察表明:材料A的磷酸盐涂层表面疏松,充满大量孔洞、裂纹,以及片状结晶、团聚的磷酸盐,而材料B的涂层致密、完整,为玻璃态。氧化实验后,材料A的涂层在8 h氧化阶段就已消耗殆尽,抗氧化能力基本消失;而材料B的涂层在8 h实验后表面涂层完整、致密,无明显损伤,在20 h实验后出现了较多的孔洞,抗氧化能力逐渐降低。
Antioxidant coatings were prepared on the surface of C / C composites by liquid phosphate impregnation and different heat treatment techniques. The experimental results show that the oxidation loss of material B prepared by slow cooling at 1 ~ 2 ° C / min reaches 47% after oxidation at 700 ° C for 20 h, while the oxidation loss of material B prepared by rapid cooling is only mere Is 0.98%. SEM observation showed that the surface of phosphate coating of Material A was loose and filled with a large number of holes, cracks and lamellae crystals and agglomerated phosphates. The coating of Material B was dense and complete, and was glassy. After the oxidation experiment, the coating of material A was exhausted in the oxidation stage of 8 h, and the anti-oxidation ability basically disappeared. However, the surface coating of material B was intact and dense without obvious damage after 8 h. h after the experiment there are more holes, anti-oxidation capacity gradually decreased.