炭材应用广泛,但在高于500℃的有氧气氛中氧化迅速,其结构和性能受到严重影响.为此,采用光聚合巯基/乙烯基聚硅氮烷(PSN-1)陶瓷先驱体在炭材料表面裂解制备抗氧化陶瓷涂层,采用偏光显微镜和X射线衍射技术探讨了涂层对炭材抗氧化性能的影响.结果表明:先驱体溶液浓度为30%时浸渍效果最好;加入质量比(Ti/PSN-1)为1/10～1/5的钛粉时,制备的涂层抗氧化性能最佳,恒温氧化120 min后,失重率仅为18%;最佳的浸渍/裂解循环次数为3次,恒温氧化120 min,失重率为15%;聚硅氮烷经高温裂解后最终生成氮化硅陶瓷.
Anti-oxidation ceramic coating was prepared on the sur-face of carbon material via pyrolysis of photopolymerisable thiol-ene polysilazane ceramic precursor. The effect of the anti-oxidation coating on the anti- oxidation behavior of carbon material was investigated by using a polarizing microscope and an X-ray diffraetometer. Results show that the thiol-ene polysilazane ceramic precursor is converted into silicon nitride ceramic after pyrolysis at elevated temperature. The best impregnation effect was achieved when the concentration of the precursor solution was kept at 30%. When the ratio of titanium powders to thiol-ene ce-ramic precursor was 1/10 ～ 1/5, the prepared ceramic coating had the best anti- oxidation behavior and showed weight loss of only 18% after oxidation for 120 min. Besides, the ceramic coat-ing prepared at an optimized impregnation-pyrolysis cycle of three had weight loss of only 15% after oxidation for 120 min.
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