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Novel and durable composite phase change thermal energy storage materials with controllable melting temperature

Journal of materials Science & Technology 2021年第27期86卷 11-19页

作者： Haiting Wei Shuiyuan Yang Cuiping Wang Changrui Qiu Kairui Lin Jiajia Han Yong Lu Xingjun Liu College of materials and Fujian Provincial Key Laboratory of materials Genome Xiamen UniversityXiamen 361005China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China Institute of materials Genome and Big Data Harbin Institute of TechnologyShenzhen 518055China Shenzhen R&D Center for Al-based Hydrogen Hydrolysis materials Shenzhen 518055China

The development of high temperature phase change materials(PCMs)with great comprehensive performance is significant in the future thermal energy storage system.In this study,novel and durable Al-Si/Al_(2)O_(3)-Al N composite PCMs with controllable melting temperature were successfully synthesized by using pristine Al powder as raw material and tetraethyl orthosilicate as SiO_(2)source.The Al_(2)O_(3)shell and Al-Si alloy were in-situ produced via the substitution reaction between molten Al and SiO_(2).Importantly,the crack caused by the incomplete encapsulation of the Al_(2)O_(3)shell could repair itself by the nitridation reaction of internal molten Al and thereby forming a highly dense Al_(2)O_(3)-Al N composite shell.The produced dense Al_(2)O_(3)-Al N composite shell could significantly improve the thermal cycling stability of composite PCMs,and thus,the thermal storage density decrease of the Al-Si/Al_(2)O_(3)-Al N(59.8 J/g to77.7 J/g)was far less than that of the Al-Si/Al_(2)O_(3)(118.5 J/g)after 3000 thermal cycles.Moreover,the synthesized Al-Si/Al_(2)O_(3)-Al N still exhibited a controllable melting temperature(571.5-637.9℃),relatively high thermal storage density(105.6-150.7 J/g),great dimensional stability and structural stability after3000 thermal cycles.Hence,the synthesized Al-Si/Al_(2)O_(3)-Al N composite PCMs,as promising preferential thermal energy storage materials,can be stably used in the energy utilization efficiency improvement of various systems for more than 6 years.

关键词： Al-Si Al_(2)O_(3)-AlN Durable Controllable melting temperature Phase change thermal storage material

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