高紫外反射ZnO/SiO2复合粉体制备及其热控涂层性能研究  

Preparation of Highly Ultraviolet Reflective ZnO/SiO2 Composite Powder and Properties of Its Thermal Control Coatings

作　　者：王萌 雷辉[1] 姜舟 孙理理[1] 马剑钢[2] 贺晨[1] 李俊峰[1] WANG Meng;LEI Hui;JIANG Zhou;SUN Li-li;MA Jian-gang;HE Chen;LI Jun-feng(Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China;Northeast Normal University,Changchun 130024,China)

机构地区：[1]航天材料及工艺研究所,北京100076 [2]东北师范大学,长春130024

出　　处：《表面技术》2020年第12期50-54,198,共6页Surface Technology

摘　　要：目的以ZnO/SiO2复合粉体为填料,开展新型热控涂层制备方法研究,提高传统白色热控涂层的紫外反射率,研制出具有太阳全光谱高反射性能的热控涂层。方法以硫酸锌和硅酸钠为原料,采用常温化学合成与高温热处理相结合的方法制备ZnO/SiO2复合粉体,通过X射线衍射仪、扫描电子显微镜及紫外可见分光光度计等仪器,对复合粉体的微观结构及光学性能进行表征。然后以ZnO/SiO2复合粉体为填料,以无机硅酸钾为粘结剂,制备了ZnO/SiO2热控涂料,通过不同颜基比和厚度的优化,得到了太阳全光谱(200~2600 nm)高反射白色热控涂层的制备方法。结果研制的ZnO/SiO2复合粉体在紫外波段的反射率均大于88%,与传统ZnO粉体相比具有明显提升。当以无机硅酸钾为粘结剂、颜基比为2:1、喷涂厚度为100~140μm时,所制备涂层在太阳全光谱呈现高反射特性,此时涂层的太阳吸收比为0.12,红外发射率为0.92。结论ZnO/SiO2热控涂层具有优异的热控性能,与传统白色热控涂层相比具有更低的吸收比,同时在太阳全光谱具有高反射特性,可以满足新一代大功率卫星长寿命和高效散热的技术需求。Regarding to the problem of low reflection in ultraviolet band of existing white thermal control coatings,ZnO/SiO2 was used as pigment to prepare a new type of thermal control coating with high reflection in full solar spectrum.With zinc sulphate and sodium silicate as raw materials,ZnO/SiO2 composite powder was synthesized via the combined method of chemosynthesis and high-heat treatment.The crystal morphology and microstructure of ZnO/SiO2 composite powder were observed by XRD,SEM and TEM,and the optical performance of ZnO/SiO2 was characterized by UV/Vis spectrophotometer.The thermal control coating was prepared with ZnO/SiO2 composite powder as pigment and potassium metasilicate as adhesive.By analyzing the optical performance of various pigment-to-adhesive ratios and thicknesses,the best coating formula which has the minimum solar absorptance was confirmed.The results showed that ultraviolet absorptance of ZnO/SiO2 composite powder was 0.09,and the reflection in ultraviolet band of ZnO/SiO2 was above 88%which was much higher than traditional ZnO pigment,proved better optical properties.The mainly mechanism of the higher reflection is the refractive index of ZnO and SiO2 was quite different so that the reflection and refraction produced at the interface between them were stronger,according to this principle,ZnO/SiO2 overcome the problem of lower ultraviolet reflectance.After optimized experiments,preparation method of the thermal control coating was obtained:pigment-to-adhesive ratio is 2:1 and the thickness of the coating is 100~140μm.The solar absorptance and infrared emittance of optimized ZnO/SiO2 thermal control coating was 0.12 and 0.92,respectively.Comparing to traditional ZnO thermal control coatings,the ZnO/SiO2 thermal control coating performs better in reflection of ultraviolet band,and at the same time,equipped with high reflection in full solar spectrum.In conclusion,the ZnO/SiO2 thermal control coating has a good application prospect in the new generation of spacecraft as it can satisfy the nee

关 键 词：ZnO/SiO2 热控涂层 高反射 太阳光谱 太阳吸收比 红外发射率 

分 类 号：TG174.44[金属学及工艺—金属表面处理]