Full Text:   <163>

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On-line Access: 2023-10-18

Received: 2022-11-16

Revision Accepted: 2023-01-16

Crosschecked: 2023-10-19

Cited: 0

Clicked: 227

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Rui SU

https://orcid.org/0009-0005-3411-537X

Qian SU

https://orcid.org/0009-0007-8260-0016

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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.10 P.912-924

http://doi.org/10.1631/jzus.A2200550


Experimental investigation of the thermal insulation performance of Ce/Si/Ti oxide heat-reflective coating


Author(s):  Rui SU, Yue LV, Qian SU, Yanfei PEI

Affiliation(s):  School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Corresponding email(s):   suqian@126.com

Key Words:  Track slab, Solar radiation, Thermochromic coating, Cooling performance


Rui SU, Yue LV, Qian SU, Yanfei PEI. Experimental investigation of the thermal insulation performance of Ce/Si/Ti oxide heat-reflective coating[J]. Journal of Zhejiang University Science A, 2023, 24(10): 912-924.

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Abstract: 
To solve the problem of deformation and cracking of ballastless track slab under temperature load, a composite oxide and a series of heat-reflective coating samples were prepared. At the microscopic level, the elemental composition and optical properties of the materials prepared were analyzed by Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy, and the feasibility of Ce/Si/Ti oxide as functional fillers for heat-reflective coatings of track slabs was demonstrated. At the macro level, by designing and assembling an indoor sunlight simulation test device, the surface and internal temperatures of the coated and uncoated concrete specimens were analyzed and studied, and the macroscopic cooling effect of the coatings was evaluated. Also, to study the engineering application effect of the track slab thermal insulation reflective coating, COMSOL was used to build a 3D calculation model of the heat transfer deformation of the ballastless track slab structure. The research results showed that: Ce/Si/Ti oxide has strong reflectivity and can reflect 95% of infrared light; it has good ultraviolet (UV) shielding ability and can absorb more than 65% of the UV light. The TiO2 coating can reduce the temperature of the concrete surface by 6‍–11°Cand that of the inside of the concrete by 10‍–‍14°C; the cooling effect decreases evenly with the increase of air temperature. The Ce/Si/Ti oxide coating can reduce the surface temperature of the concrete by 16 °C and that of the inside of the concrete by 15 °C. In addition, the cooling effect is basically not affected by the air temperature, and it changes non-linearly with the increase of the Ce/Si/Ti oxide content. Numerical calculation shows that the heat reflective coating can reduce the surface temperature and internal temperature difference of the track slab by 11.54–21.31 °C, and the vertical displacement of the track slab can be reduced by about 35%‍–‍70%. Considering the cooling effect, the adhesion strength, and the engineering application effect of the coating, the optimal doping amount of Ce/Si/Ti oxide is 40%, and that coating is the most suitable for use as a ballastless track heat reflective coating.

Ce/Si/Ti氧化物热反射涂层对高速铁路轨道板温度场影响及其优化研究

作者:苏芮,吕悦,苏谦,裴彦飞
机构:西南交通大学,土木工程学院,中国成都,610031
目的:为解决无砟轨道板在温度荷载作用下变形开裂的问题,本文研制了一种复合氧化物,并制备一系列热反射涂层试样,旨在通过宏观和微观试验,以及数值仿真探究影响涂层降温效果的环境温度,得到一种能够有效减小无砟轨道板温度应力和温度变形的热反射涂层,以提高轨道板的使用寿命,减少维修次数。
创新点:1.制备一种具有紫外屏蔽性的无机复合氧化颗粒;2.设计一系列复合氧化物热反射涂层;3.研制室内太阳光模拟试验系统;4.通过室内试验分析涂层降温效果。
方法:1.制备一系列热反射涂层;2.微观层面,通过傅里叶变换红外、紫外可见光谱,对本文所制备材料进行成分和光学特性分析,论证Ce/Si/Ti氧化物作为轨道板热反射涂层功能填料的可行性;3.宏观层面,通过搭建室内太阳光模拟测试装置,分别对有涂层和没有涂层的混凝土试件表面和内部温度进行分析研究,讨论本文所制备涂层的宏观隔热效果;4.通过数值仿真对轨道板结构传热变形三维模型研究轨道板隔热反射涂层的工程应用效果。
结论:1.热反射涂层能够使轨道板表面温度和内部温差降低11.54~21.31°C,当Ce/Si/Ti氧化物掺入量为40%~50%时,涂层降温效果较优异,能够使轨道板表面温度降低70%,温差减少40%左右,并且使轨道板竖向位移减小约70%。2.综合考虑涂层的隔热率、混凝土内部温差和涂层附着强度以及轨道板变形控制效果,Ce/Si/Ti氧化物的最优掺入量为40%,且该涂层最适合用作轨道板隔热涂层。

关键词:轨道板;太阳辐射;隔热涂层;降温性能

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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