Journal of Materials Science

, Volume 42, Issue 12, pp 4701–4706 | Cite as

Microstructure characterization of in situ synthesized porous Si3N4–Si2N2O composites using feldspar additive

  • Rajat Kanti Paul
  • Chi-Woo Lee
  • Hai-Doo Kim
  • Byong-Taek LeeEmail author


Porous Si3N4–Si2N2O bodies fabricated by multi-pass extrusion process were investigated depending on the feldspar addition content (4–8 wt% Si) in the raw silicon powder. The diameter of the continuous pores was about 250 μm. The polycrystalline Si2N2O fibers observed in the continuous pores as well as in the matrix regions of the nitrided bodies can increase the filtration efficiency. In the 4 wt% feldspar addition, the diameter of the Si2N2O fibers in the continuous pores of the nitrided bodies was about 90–150 nm. A few number of rope typed Si2N2O fibers (∼4 μm) was found in the case of 8 wt% feldspar addition. However, in the 8 wt% feldspar addition, the matrix showed highly porous structure composed of large number of the Si2N2O fibers (∼60 nm). The relative densities of the Si3N4–Si2N2O bodies with 4 wt% and 8 wt% feldspar additions were about 65% and 61%, respectively.


Filtration Efficiency Silicon Powder Matrix Region Nitridation Process Ethylene Vinyl Acetate 



This work was supported by the “Center for Environmentally, Friendly Vehicles” of Eco-Technopia Project.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Rajat Kanti Paul
    • 1
  • Chi-Woo Lee
    • 1
  • Hai-Doo Kim
    • 2
  • Byong-Taek Lee
    • 3
    Email author
  1. 1.School of Advanced Materials EngineeringKongju National UniversityKongju City, ChungnamSouth Korea
  2. 2.Ceramic Materials GroupKorea Institute of Machinery and MaterialsChangwon, KyungnamSouth Korea
  3. 3.Department of Biomedical Engineering and Materials, School of MedicineSoonchunhyang UniversityCheonan-citySouth Korea

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