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

作　　者：Haiting Wei Shuiyuan Yang Cuiping Wang Changrui Qiu Kairui Lin Jiajia Han Yong Lu Xingjun Liu 

机构地区：[1]College of Materials and Fujian Provincial Key Laboratory of Materials Genome,Xiamen University,Xiamen 361005,China [2]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Shenzhen 518055,China [3]Institute of Materials Genome and Big Data,Harbin Institute of Technology,Shenzhen 518055,China [4]Shenzhen R&D Center for Al-based Hydrogen Hydrolysis Materials,Shenzhen 518055,China

出　　处：《Journal of Materials Science & Technology》2021年第27期11-19,共9页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51771158);the Development and Reform Commission of Shenzhen Municipality(No.ZX20190229)。

摘　　要：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 

分 类 号：TB34[一般工业技术—材料科学与工程]