Insights into the thermal safety of ambient pressure dried hydrophobic montmorillonite/silica aerogel composites

被引:8
作者
Wang, Xiaowu [1 ]
Liu, Qiong [1 ]
Li, Ming [1 ]
Chen, Zhenkui [2 ]
Cheng, Xudong [3 ]
Wu, Xiaoxu [1 ]
Li, Zhi [1 ]
机构
[1] Cent South Univ, Sch Resource & Safety Engn, Changsha 410083, Peoples R China
[2] Army Infantry Coll PLA, Dept Engn Technol & Applicat, Nanchang 330103, Peoples R China
[3] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230027, Peoples R China
基金
中国国家自然科学基金;
关键词
Hydrophobic silica aerogels; Montmorillonite; Thermal insulation; Thermal stability; Combustion properties; SILICA AEROGELS; SODIUM-SILICATE; STRUCTURAL MODIFICATION; PHYSICAL-PROPERTIES; FLAMMABILITY; PRECURSOR; CLAY; CONDUCTIVITY; SILYLATION; ACID;
D O I
10.1016/j.ceramint.2023.11.321
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
To improve the thermal safety of hydrophobic silica aerogels (SAs), montmorillonite (MMT) was used as a dopant to prepare MMT/silica aerogel composites (MMT/SAs) and their basic physicochemical properties and thermal safety were investigated in detail. It finds that a physical combination is formed between MMT and SAs, and the introduction of MMT does not change the three-dimensional mesoporous structures of the MMT/SAs. With the MMT content increasing, the MMT/SAs maintain a low density (0.12-0.19 g/cm(3)), high porosity (91.1-93.5 %), low thermal conductivity (0.023-0.025 mW/(m center dot K)) and high hydrophobicity (>140 degrees). Compared with pure SAs, the thermal stability of the MMT/SAs was significantly improved, with the onset and peak temperatures of thermal decomposition increasing by 147 degrees and 117 degrees, respectively. The gross calorific value, peak heat release rate (PHRR) and total heat release (THR) decrease by 50.8 %, 29.6 % and 34.7 % respectively, while the time to ignition (TTI) increases, all of these verify the greatly reduced flammability and fire risk. This work confirms that introducing MMT into hydrophobic SAs is feasible to improve their thermal safety without impairing their excellent properties too much, thus contributing to the expansion of their thermal insulation applications.
引用
收藏
页码:6135 / 6145
页数:11
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