HTR堆内碳素构件孔结构及吸湿特性研究  

Pore Structure and Moisture Absorption Property of Carbon Materials in HTR

作　　者：卢振明[1] 陈晓彤[1] 魏利强[1] 周湘文[1] 张杰[1] 刘兵[1] 

机构地区：[1]清华大学核能与新能源技术研究院先进核能技术协同创新中心先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《原子能科学技术》2016年第3期477-483,共7页Atomic Energy Science and Technology

基　　金：国家科技重大专项资助项目(ZX06901);清华大学自主科研计划资助项目(20121088038);国家自然科学基金资助项目(21405092)

摘　　要：通过压汞法、N_2吸附法,结合SEM研究了石墨（IG-110）和含硼炭砖（BC）的孔结构,采用XPS分析了材料表面基团,测试了两种材料在不同湿度环境下的动态吸湿过程,分析了孔结构、表面基团、环境湿度对吸湿量的影响,为高温气冷堆（HTR）堆内碳素构件的防潮、除湿提供科学参考。结果显示：BC拥有发达的5μm以上开口大孔,存在广泛的中孔级别裂隙;IG-110则绝大多数为开口孔隙,1～5μm的孔隙较为集中。开口孔径的大小和数量是影响吸湿的重要因素。BC平衡吸湿量明显大于IG-110平衡吸湿量;两种材料在不同湿度条件下初始2h内的吸湿量急速增长;不同湿度条件下,一般在5～8h内都能达到平衡,在25℃下湿度为60%～90%时平衡吸湿量随湿度呈线性关系。In this work,the dynamic moisture adsorption processes and influence factor analysis of moisture adsorption property of graphite（IG-110）and boron carbide（BC）were studied,which are significant for moisture proof and dehumidification in high temperature gas-cooled reactor（HTR）.The micropore structures were studied by mercury porosimetry,N2 adsorption and SEM,and the surface functional groups were characterized by XPS.BC possesses a large amount of closed pores,with abundant opening pores above 5μm and slit at mesoporous level;whereas most pores in IG-110 are opened with the size between 1-5μm.According to this study,the size and the amount of pores areboth key factors to moisture adsorption properties.The equilibrium moisture adsorption content of BC is obviously larger than that of IG-110,with a rapid growth of moisture absorption content for both materials in the initial 2h.Under different moisture conditions,the absorption equilibriums of two materials are generally achieved in 5-8h,and the equilibrium moisture absorption contents are linearly with the humidity in the range of 60%-90% at 25 ℃.

关 键 词：高温气冷堆 石墨 含硼炭砖 孔结构 吸湿特性 

分 类 号：TB303[一般工业技术—材料科学与工程] TL34[核科学技术—核技术及应用]