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BAS系微晶玻璃抗氧化涂层的制备与性能

, PP. 74-79

Keywords: 复合材料,Cf/SiC,抗氧化涂层,微晶玻璃,钡长石

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Abstract:

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10min)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。

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