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 1.5 μm,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.
lightweightingporous Al2O3CT scanning technologypore size distributiongrey theory
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