纳米SiC改性Na_(2)SO_(4)·10H_(2)O-Na_(2)HPO_(4)·12H_(2)O共晶盐纳米相变流体制备及其性能影响  

Preparation and Performance of Na_(2)SO_(4)·10H_(2)O-Na_(2)HPO_(4)·12H_(2)O Eutectic Hydrated Salt Phase Change Nanofluids Modified by Nano-SiC

作　　者：孙增宝 柳馨 铁生年 SUN Zengbao;LIU Xin;TIE Shengnian(New Energy Photovoltaic Industry Research Institute,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学,新能源光伏产业研究中心,西宁810016

出　　处：《硅酸盐学报》2023年第10期2644-2652,共9页Journal of The Chinese Ceramic Society

基　　金：青海省自然基金项目(2021-ZJ-906);材料复合新技术国家重点实验室(武汉理工大学)开放基金项目(2020-KF-1)。

摘　　要：为提升水合盐相变材料的性能,以Na_(2)SO_(4)·10H_(2)O-Na_(2)HPO_(4)·12H_(2)O共晶盐(EHS)作为基体材料,采用HF/HNO_(3)刻蚀法制备亲水性纳米碳化硅(Nano-SiC),并以Na_(2)SiO_(3)·9H_(2)O和改性Nano-SiC作为复合添加剂制备复合纳米相变流体材料(Nano-SiC EHS PCMs)。结果表明:改性后Nano-SiC在EHS PCMS中具有良好的分散稳定性,同时Na_(2)SiO_(3)·9H_(2)O和Nano-SiC协同作用下使得EHS PCMs过冷度降低到0.3℃,无相分层现象。Nano-SiC EHS PCMs在固液相变体系中热导率均有提升,同时添加0.2%(质量分数)Nano-SiC后EHS PCMS储能时间缩短了21.8%。添加质量分数为0.15%Nano-SiC的EHS PCMs熔融焓和结晶焓分别为267.3 J/g和231.4 J/g,经过1000次冷热循环后焓值变化甚小,该体系具有良好的循环稳定性。It is important to enhance their performance of supercooling and low thermal conductivity in hydrate salt phase change materials.A hydrophilic silicon carbide(nano-SiC)was prepared via treating SiC nanoparticles in HF/HNO_(3) with Na_(2)SO_(4)·10H_(2)O-Na_(2)HPO_(4)·12H_(2)O eutectic hydrated salt as basic materials,and the phase change nanofluids materials(nano-SiC EHS PCMs)with Na_(2)SiO_(3)·9H_(2)O and nano-SiC were composited.The results show that the modified nano-SiC can be dispersed in EHS PCMs.The synergistic effect of Na_(2)SiO_(3)·9H_(2)O and nano-SiC can reduce the supercooling degree to 0.3℃without the phase separation.The thermal conductivity of nano-SiC EHS PCMs enhances both in solid and liquid.The energy storage time of EHS PCMS with 0.2%(in mass)nano-SiC is decreased by 21.8%.The enthalpy of melting and crystallization of EHS PCMs with 0.15% nano-SiC is 267.3 J/g and 231.4 J/g,respectively.The enthalpy of nano-SiC EHS PCMs is stable after 1000 heating and cooling cycles,indicating that nano-SiC EHS PCMs have a great thermal cyclic stability.

关 键 词：纳米碳化硅 表面改性 共晶盐 纳米相变流体 

分 类 号：TB34[一般工业技术—材料科学与工程]