Pore geometry of 3D-Cf/SiC composites by mercury intrusion porosimetry

被引:10
作者
Li, Wei [1 ]
Chen, Zhao Hui [1 ]
机构
[1] Natl Univ Def Technol, Coll Aerosp & Mat Engn, State Key Lab Adv Ceram Fibers & Composites, Changsha 410073, Hunan, Peoples R China
关键词
Porosity; CMCs; 3-Dimensional reinforcement; Analytical model; Mercury intrusion; SIC/SIC COMPOSITES; NITROGEN SORPTION; CATALYST SUPPORTS; MICROSTRUCTURE; HYSTERESIS;
D O I
10.1016/j.ceramint.2008.02.011
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The 3D-C-f/SiC composites fabricated via precursor infiltration and pyrolysis (PIP) are porous inside due to their specific processing. To evaluate the porosity of 3D-C-f/SiC, a novel procedure of mercury intrusion porosimetry (MIP) was adopted to extract information from the hysteresis and entrapment. This method is able to eliminate the temporarily retained Hg at atmospheric pressure from the real entrapment due to topological reasons. From the interpretation of the MIP primary and secondary intrusion-extrusion data, accompanied by scanning electron microscopy (SEM) analysis and bubble point measurement, the pore geometry of 3D-C-f/SiC is supposed to be a 3D network originating from the architecture of braided carbon fabrics. This network is composed of hundreds of micron-sized large chambers between bundles, micro-cracks below 0.1 mu m and medium-sized channels about 20-4 mu m that bridge the former two and provide passages for fluids permeating the material. (C) 2008 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:747 / 753
页数:7
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