Inorganic Chemicals Industry >
Study on durability of silica aerogel/fiber composites under ultraviolet aging
Received date: 2024-08-21
Online published: 2024-11-22
With tetraethoxysilane as silicon source，trimethylchlorosilane as hydrophobic modifier，basalt fiber，basalt fiber high silica fiber composite and high silica fiber as matrix materials，three kinds of SiO2 aerogel composites were prepared by sol-gel method and supercritical drying technology，and the changes of microstructure and performance of aerogel composites under ultraviolet environment were explored.The results showed that before the ultraviolet aging test，the fiber as the framework of the composite was tightly wrapped by the aerogel，and the two formed a close combination.After the test，the basalt fiber/aerogel composites，basalt fiber high silica fiber/aerogel composites and high silica fiber/aerogel composites all had micro pit structures on their surfaces.A small number of fibers were separated from the aerogel，and the aerogel structure was also becoming loose.The mechanical properties were reduced by 9.8%，11.9%，and 9.1%，respectively，while the thermal conductivity was increased by 8.3%，8.5%，and 5.4%.Based on the theory of equivalent radiation，the prediction equation of UV aging life in natural environment was established.Taking the decline of mechanical properties below 10% as the failure threshold，the ultraviolet aging life in natural environment was predicted to be 10.0，10.8，and 10.9 a，respectively.The three aerogel composites showed the potential of long-term stable service in the ultraviolet radiation environment of bridges，and were expected to be used in the field of bridge fire prevention.
KANG Zhuangsu , FAN Chuanbin , SHI Fangchang , CHEN Huanyong , YAO Zhian , JIA Shuaide , KANG Dawei , MIN Liang , LI Jia , MENG Qingkun , QI Jiqiu . Study on durability of silica aerogel/fiber composites under ultraviolet aging[J]. Inorganic Chemicals Industry, 2025 , 57(9) : 53 -60 . DOI: 10.19964/j.issn.1006-4990.2024-0466
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