碳化硅对镁橄榄石基复合相变蓄热材料结构与性能的影响  

Effects of silicon carbide on structure and performance of forsterite-based composite phase change thermal storage material

作　　者：唐明雨 刘浩[1] 刘文元 王周福[1] 马妍[1] 王玺堂[1] Tang Mingyu;Liu Hao;Liu Wenyuan;Wang Zhoufu;Ma Yan;Wang Xitang(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《武汉科技大学学报》2022年第2期107-112,共6页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(U20A20239,51672195);国家级大学生创新创业训练计划项目(202110488002);武汉科技大学国防预研基金(GF201909).

摘　　要：以镁橄榄石为基体材料、NaCl-KCl混合盐为相变介质、碳化硅为导热增强剂,采用混合烧结法制备了镁橄榄石基复合相变蓄热材料。通过对所制材料物相结构、显微组织及相关性能进行表征,重点研究了碳化硅粒度及含量对材料导热性能与蓄热性能的影响。结果表明,镁橄榄石基复合相变蓄热材料的最佳制备温度为700℃;减小碳化硅颗粒尺寸并提高其掺入量,可以避免复合材料中无机盐的局部聚集,降低熔盐挥发损失,有助于在材料结构中形成导热通道,进而增强材料的热传导能力并提高材料的热循环稳定性。With forsterite as matrix material,NaCl-KCl mixed salt as the phase change medium and silicon carbide as the thermal conductivity enhancement additive,forsterite-based composite phase change thermal storage materials were prepared by the hybrid sintering method.The phase composition,microstructure and properties of the prepared materials were characterized,and the effects of silicon carbide particle size and content on the thermal conductivity and thermal storage properties of the materials were discussed in detail.The results show that the optimum preparation temperature is 700℃.The decreased size and increased amount of silicon carbide particles can avoid local aggregation of inorganic salts and reduce volatilization loss of molten salts,therefore in favour of the formation of thermal conduction channel in the material structure,resulting in the enhanced thermal conductivity and thermal cycling stability of the researched materials.

关 键 词：相变蓄热材料 氯化盐 镁橄榄石 碳化硅 导热性 蓄热性能 热循环稳定性 

分 类 号：TB34[一般工业技术—材料科学与工程]