Characterization of reticulated ceramic foams with mercury intrusion porosimetry and mercury probe atomic force microscopy
Characterization of reticulated ceramic foams with mercury intrusion porosimetry and mercury probe atomic force microscopy
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DOI：
10.1016/j.ceramint.2018.09.094
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发表时间：
2018-12
影响因子：
5.2
通讯作者：
C. Voigt;J. Hubálková;Lisa Ditscherlein;Ralf Ditscherlein;U. Peuker;H. Giesche;C. Aneziris
中科院分区：
文献类型：
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作者：
C. Voigt;J. Hubálková;Lisa Ditscherlein;Ralf Ditscherlein;U. Peuker;H. Giesche;C. Aneziris
本文探讨了压汞孔隙法是否适合用于表征网状泡沫陶瓷孔隙度的测量方法。网状泡沫陶瓷具有三种孔隙：功能孔隙、材料孔隙和聚合物泡沫分解后残留的支撑空腔。研究了由al2o3和Al2O3-C制成的网状泡沫陶瓷样品，其功能孔径在10 ~ 60 ppi（孔/英寸）之间。结果表明，利用压汞孔计测量材料的支撑孔洞和入口孔道是可行的。支撑腔直径的结果在很大程度上取决于用于制备陶瓷泡沫的聚氨酯泡沫的ppi值。对于网状Al2O3-C泡沫样品，没有观察到汞的挤压。讨论了汞未挤出的原因。此外，原子力显微镜（AFM）对al2o3和Al2O3-C样品进行了测量，使用最新的AFM方法来检查汞滴与粗糙表面之间的相互作用。研究了接近/回撤速度、再现性和施加力等因素。可以看出，al2o3比Al2O3-C测得更大的引力。
This study addresses the question of whether mercury intrusion porosimetry is an appropriate measurement devise for the porosity characterization of reticulated ceramic foams which features three kinds of pores: functional pores, material pores and strut cavities remaining after decomposition of the polymeric foam. Reticulated ceramic foam samples made of Al2O3and Al2O3-C and with functional pore sizes between 10 and 60 ppi (pores per inch) were investigated. The results show that it is feasible to measure the strut cavities and the entryways of the material pores with the help of the mercury intrusion porosimeter. The results for the strut cavity diameter depends strongly on the ppi number of the polyurethane foam used for the preparation of the ceramic foam.For the reticulated Al2O3-C foam samples no extrusion of the mercury is observed. Reasons for the missing extrusion of mercury are discussed.Furthermore, atomic force microscopy (AFM) measurements on Al2O3and Al2O3-C samples are carried out using a recent AFM method to examine interactions between a mercury droplet and rough surfaces. Factors like approach/retrace speed, reproducibility and applied force are investigated. It is seen that for Al2O3larger attractive forces are measured than for Al2O3-C.