轻量化氧化铝孔结构特征对材料性能的影响  

Effect of pore structure characteristics of lightweight alumina on material properties

作　　者：郭童双 丁军[1] 邓承继[1] 余超[1] 祝洪喜[1] GUO Tongshuang;DING Jun;DENG Chengji;YU Chao;ZHU Hongxi(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,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：《钢铁研究学报》2024年第10期1326-1335,共10页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(U20A20239);湖北省重点研发专项资助项目(2023BAB106)。

摘　　要：为研究轻量化过程中气孔对材料性能的影响,制备了具有不同孔结构参数的多孔氧化铝,并利用压汞仪和CT扫描技术对材料孔结构进行表征,采用灰色理论研究了孔结构变化对材料性能的影响。结果表明,随着材料气孔率的提高,其体积密度逐渐下降,且多孔氧化铝的耐压强度和导热系数显著降低。不同孔径区间对材料性能影响存在较大差异,孔径分布小于1.5μm的孔对材料耐压强度和导热系数影响最大,而孔径分布大于150μm的孔对材料的性能影响最小。因此,在材料轻量化的过程中,提高孔径分布在小于1.5μm孔的占比更有利于提升材料的综合性能。To investigate the impact of porosity on material properties during the lightweighting process,porous alumina specimens with varying pore structure parameters were meticulously fabricated.Subsequently,the specimen′s pore structure was meticulously characterized utilizing advanced techniques like mercury intrusion porosimetry and CT scanning technology.Employing the grey theory,the repercussions of alterations in pore structure on material properties were systematically explored.The outcomes underscore a consistent trend:as porosity escalates,the bulk density of porous alumina registers a corresponding gradual reduction.Additionally,the compressive strength and thermal conductivity of the porous alumina exhibit noteworthy declines in tandem with increasing porosity.Importantly,it was observed that the distribution of pore sizes,particularly those smaller than 1.5μm,wields a profound influence over both compressive strength and thermal conductivity.Conversely,the pore size distribution exceeding 150μm exerts a notably milder impact on material properties.In essence,our findings underscore the importance of augmenting the proportion of pores with sizes falling below 1.5μm during the material lightweighting process,as this strategy proves most efficacious in enhancing the overall material performance.

关 键 词：轻量化 多孔氧化铝 CT扫描技术 孔径分布 灰色理论 

分 类 号：TQ175.6[化学工程—硅酸盐工业]