3D characteristics of pores in SiC particle preforms with different starch contents by X-ray micro-computed tomography. Issue 18 (15th December 2019)

• Record Type: Journal Article
• Authors: Xie, Bin; Zhao, Haidong; Long, Han; Peng, Jialin; Liu, Ruizhe
• Is Part Of: Ceramics international. Volume 45:Issue 18(2019)Part A
• Page Start: 23924
• Page End: 23933
• Publication Date: 2019-12-15
• Subjects: Preform -- Porosity -- MMCs -- Non-destructive testing; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.07.281
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: High resolution X-ray micro-computed tomography was used to non-destructively characterize pore structures in silicon-carbide particle (SiCp) preforms with different starch contents. Three-dimensional models for porosity network were reconstructed, and characteristics for both pores and throats were calculated for the preforms. As the starch contents increased (no more than 8 wt%), the pores with small size and the "pore-neck" structures were formed due to the gap expansion caused by the escape of decomposed gas of starches. When using 15 wt% starches, larger gap expansion due to decomposed gas led to the connection of neighbored small pores and the break of "pore-neck" structures, and hence, increased the pore and throat sizes, pore coordination numbers and connectivity. The porosity measured by the Archemedes', mercury porosimetry, and 3D X-ray μ-CT methods were compared and discussed. It was found that the mercury porosimetry method may underestimate pore fractions and sizes.