锆酸钆热障涂层表面三防漆附着性及隔热性能研究  

Adhesion and Thermal Insulation Performance of the Antiseptic Paint on the Surface of Gadolinium Zirconate Thermal Barrier Coating

作　　者：李春 高旭 耿琼 杨震晓[1] 倪立勇[1] 杜欣蔚 李婷 马康智 文波[1] LI Chun;GAO Xu;GENG Qiong;YANG Zhenxiao;NI Liyong;DU Xinwei;LI Ting;MA Kangzhi;WEN Bo(Institute of Aerospace Materials and Processing Technology,Beijing 100076,China)

机构地区：[1]航天材料及工艺研究所,北京100076

出　　处：《材料保护》2025年第2期73-82,共10页Materials Protection

基　　金：国家自然科学基金项目(52371044)。

摘　　要：通常在航天飞行器热端部件表面喷涂热障涂层来提升金属基材的承温能力,涂层在生产后常面临数年的贮存期,为了提升热障涂层的防盐雾、防湿热、防霉菌(三防)性能,可在其表面涂覆三防漆。本工作研究了TL-43三防漆在不同显微形貌的锆酸钆(GZO)热障涂层表面的润湿和铺展行为,并测试了涂层的附着力,明确了GZO+TL-43复合涂层在高温热暴露过程中的热导率变化规律及物理本质。结果表明:GZO涂层在等离子焰中熔融良好,呈典型的层状结构,增加喷涂距离可以显著降低GZO涂层的表面粗糙度及未完全熔融的直径为1~3μm的细小粒子数量,进而降低TL-43涂料在其表面的接触角,当喷涂距离为110 mm时沉积的GZO涂层上TL-43的接触角低至37.8°。不同工艺下,复合涂层的附着力均为0级。当喷涂距离为90 mm时制备的GZO-90和TL-43复合后涂层在制备态下的热导率为0.94 W/(m·K),隔热性能与单一的GZO涂层相比较弱,但在1100℃下热暴露10 min后GZO-90+TL-43复合涂层和单一的GZO涂层的热导率均变为约0.86 W/(m·K)。本研究对在热障涂层上喷涂三防漆提供工艺基础,同时对等离子喷涂层上有机涂料的喷涂具有良好的借鉴作用,也可以为复合涂层的结构设计提供理论支撑。Thermal barrier coatings are commonly sprayed onto the surfaces of hot⁃end components of aerospace vehicles to enhance the temper⁃ature⁃bearing capacity of metal substrates.After large⁃scale production,these coatings typically face a storage period of several years.To im⁃prove the salt spray resistance,hygrothermal resistance and mold resistance(commonly known as antiseptic properties)of thermal barrier coat⁃ings,antiseptic paint could be applied on their surfaces.In this work,the wetting and spreading behaviors of TL⁃43 antiseptic paint on the sur⁃faces of gadolinium zirconate(GZO)thermal barrier coatings with different micro morphologies were investigated,and the adhesion of the coat⁃ings was tested.Meanwhile,the variation pattern and physical essence of the thermal conductivity of the GZO+TL⁃43 composite coating during high⁃temperature thermal exposure were clarified.Results indicated that the GZO coating melted well in the plasma flame and exhibited a typi⁃cal layered structure.Increasing the spraying distance could significantly reduce the surface roughness of the GZO coating and the number of fine and incompletely⁃melted particles with a diameter of 1~3μm,thereby decreasing the contact angle of the TL⁃43 paint on its surface.When the spraying distance was 110 mm,the contact angle of TL⁃43 on the deposited GZO coating was as low as 37.8°.Under different proces⁃ses,all of the adhesion of the composite coating was grade 0.The thermal conductivity of the as⁃prepared GZO⁃90 with spraying distance of 90 mm after compounding with TL⁃43 was 0.94 W/(m·K),suggesting that its thermal insulation performance was weaker than that of the single GZO coating.However,after thermal exposure at 1100℃for 10 min,the thermal conductivities of both the GZO⁃90+TL⁃43 composite coat⁃ing and the single GZO coating became approximately 0.86 W/(m·K).This research not only provides a technological foundation for spraying antiseptic paint on thermal barrier coatings,but also offers a valua

关 键 词：锆酸钆 热障涂层 三防漆 附着力 接触角 热导率 

分 类 号：TG174.4[金属学及工艺—金属表面处理]