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利用2层不同软化温度和不同热膨胀系数的BaO-Al2O3-SiO2(BAS)系微晶玻璃,采用浆料涂覆—浸渍—多层共烧的方法制备了2种双层同组分和1种双层不同组分的Cf/SiC复合材料抗氧化涂层。3种结构的BAS系微晶玻璃涂层完整、无明显缺陷,涂层与Cf/SiC复合材料的结合状态良好,有助于提高Cf/SiC复合材料的抗氧化性能。双层不同组分的BAS系微晶玻璃涂层在1200～1350℃范围内对提高Cf/SiC复合材料抗氧化性能的作用显著,失重速率和失重量均明显减小。与未包覆涂层的复合材料相比,包覆双层不同组分涂层的复合材料经历600次(每次保温10 min)热冲击后的失重降低了1/2～2/3,保留的强度提高了7～15倍。
Two kinds of bilayer components and one kind of bauxite were prepared by slurry coating-impregnation-multilayer co-firing using two layers of BaO-Al2O3-SiO2 (BAS) glass-ceramics with different softening temperature and different thermal expansion coefficients Cf / SiC Composite Antioxidant Coating with Two Different Components. The three kinds of BAS-based glass-ceramic coatings are complete and have no obvious defects. The combination of coatings and Cf / SiC composites is good, which helps to improve the oxidation resistance of Cf / SiC composites. The results show that the weight loss rate and the weight loss of BAS series glass-ceramic coatings with different compositions of two layers are significant in increasing the oxidation resistance of Cf / SiC composites at 1200-1350 ℃. Compared with the uncoated composites, the composite coated with two layers of different components reduced the weight loss by 1/2 to 2/3 after 600 shocks (10 min each time) The intensity increased by 7 to 15 times.