C/SiC刹车材料硼硅玻璃/磷酸盐系防氧化涂层的结构与性能

Microstructure and properties of borosilicate glass/phosphate coating for oxidation protection of C/SiC brake materials

采用涂刷法在C/SiC刹车材料表面制备硼硅玻璃/磷酸盐系防氧化涂层。分析了硼硅玻璃/磷酸盐系涂层的防氧化性能及抗热震性能。结果表明,硼硅玻璃/磷酸盐涂层均匀、致密,并与基体结合紧密。在干态空气环境中700℃氧化10 h,涂层试样失重率约为0.39%;经过淡水和海水浸泡后涂层样氧化失重率分别为~0.22%和~0.13%。因此,硼硅玻璃/磷酸盐涂层具有优异的防氧化性能,尤其具有优良的耐淡水、耐海水侵蚀性能。在经过50次热震实验后,涂层试样与基体结合良好,没有剥落和掉块现象,失重率仅为0.015%,具有良好的抗热震性能。

Brushing method was used to prepare borosilicate glass/phosphate coating on C/SiC brake materials for oxidation protection.Oxidation protection and thermal shock resistance properties of borosilicate glass/phosphate coating were analyzed.The results indicated that uniform and dense coating of borosilicate glass/phosphate can closely adhere on the composite substrates.After oxidation at 700 °C in dry air condition for 10 h,weight loss ratio of the coating sample was 0.39%,While,it was 0.22% and 0.13% of samples with immersion fresh water and sea water,respectively.Therefore,borosilicate glass/phosphate coating possesses exellent oxidation protection property,as well as fresh water and sea water corrosion resistance properties.After thermal shock for 50 times,the adhesion bettween the coating and the composite substrates was still good,and the phenomenon of crumbling and sloughing was not observed,meanwhile,the weight loss ratio of the coating sample was merely 0.015%.The coating showed exellent thermal shock resistance properties.