Near zero thermal performance loss of Al-Si microcapsules with fibers network emb e dde d Al_(2)O_(3)/AlN shell  

作　　者：J.X.Zhang M.J.Zhang H.F.Li H.Z.Gu D.Chen C.H.Zhang Y.F.Tian E.J.Wang Q.N.Mu 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy(Wuhan University of Science and Technology),Wuhan 430081,China [2]Faculty of Materials Science and Chemistry,Engineering Research Center of Nano-Geomaterials of Ministry of Education,China University of Geosciences,Wuhan 430078,China [3]Henan Shenma Carbon Reduction Technology Co.,Ltd,Pingdingshan 467000,China

出　　处：《Journal of Materials Science & Technology》2024年第9期48-56,共9页材料科学技术（英文版）

基　　金：financial support from the National Natural Science Foundation of China(No.52072276);Hubei Important Project on Science and Technology(No.2022BECO20).

摘　　要：Al-Si alloy,a high temperature phase change material,has great potential in thermal management due to its advantages of high heat storage density and thermal conductivity.Microencapsulation of Al-Si alloy is one of the effective techniques to solve high temperature leakage and corrosion.In this paper,commercial Al-10Si alloy micro powders were encapsulated with flexible ceramic shells whose total thickness is below 1μm by hydrothermal treatment and heat treatment in N_(2) atmosphere.The compositions and microstructures were characterized by XRD,SEM and TEM.The shell was composed of AlN fibers network structure embedded withα-Al_(2)O_(3)/AlN which prevented the alloy from leaking and oxidizing,as well as had excellent thermal stability.The latent heat of microcapsules was 351.8 J g^(-1)for absorption and 372.7 J g^(-1)for exothermic.The microcapsules showed near zero thermal performance loss with latent heat storage(LHS)/release(LHR)was 353.2/403.7 J g^(-1)after 3000 cycles.Compared with the published Al-Si alloy microcapsules,both high heat storage density and super thermal cycle stability were achieved,showing promising development prospects in high temperature thermal management.

关 键 词：Al-Si alloy MICROCAPSULES Ceramic shell AlN fiber network Thermal performance 

分 类 号：TG14[一般工业技术—材料科学与工程]