炭/炭复合材料表面熔盐反应制备TiC涂层及其性能研究  

The preparation and performance of TiC coatings on the surface of carbon/carbon composites by molten salt method

作　　者：吕品[1] 肖志超[1] 张永辉[1] 赵松[1] 苏君明[1] 

机构地区：[1]西安航天复合材料研究所,陕西西安710025

出　　处：《炭素技术》2014年第3期26-29,共4页Carbon Techniques

摘　　要：利用熔盐反应法在由NaCl和KCl组成的混合盐体系中成功地在炭／炭复合材料表面制备出TiC涂层。使用XRD和SEM等方法对涂层的晶相组成和微观形貌进行了分析和观察。研究了涂层试样从室温到1200℃范围内的氧化行为以及在800℃静态空气中的氧化失重情况。结果表明：在850～950℃内能够在炭，炭复合材料表面制备TiC涂层，存950℃制备的TiC涂层中还含有AlCTi2。随着反应温度的升高，涂层的厚度增加，涂层颗粒尺寸增大。在950℃保温6h制备的涂层完整均匀，与基体的结合良好，但是在局部区域仍有微小的裂纹存在。高温生成的AlCTi2在一定程度上提高了涂层试样的抗氧化性，涂层后炭／炭复合材料的起始氧化失重温度从原来的450℃升高到800℃左右，氧化12h的失重率为5．09％。The TiC coatings were prepared successfully on the surface of carbon/carbon composites by molten salt method in the salt mixture of NaCI and KCI. The composition and microstructure of TiC coatings were analyzed by XRD and SEM. The oxidation be- havior of coating samples from room temperature to 1 200 ℃ and the oxidation weight loss at 800 ℃ in air were investigated. The results show that TiC coatings can be prepared on the surface of carbon/carbon composites at 850-950 ℃, and the TiC coatings prepared at 950℃ contain AICTi2. With the increase of reaction temperature, the thickness and particle size of TiC caotings increase. Homogeneous TiC coatings are formed on the surface of carbon/carbon composites at 950 ℃ for 6 h, and the coatings adhere well with the matrix. But there exist a few micro-cracks in the local area. AlCTi2 generated at a high temperature, improves the oxidation composite resistance of the coating samples in a certain extent. After coating, the oxidation weight loss initiation temperature of the carbon/carbon composite is increased from 450 ℃ to about 800 ℃ and the weight loss rate is 5.09% after oxidation for 12 h.

关 键 词：炭炭复合材料 熔盐法 涂层 抗氧化 

分 类 号：TB332[一般工业技术—材料科学与工程]