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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.119  No.1388 (April) (2011)  >  pp.319-321

Journal of the Ceramic Society of Japan
<<Previous article Vol.119  No.1388 (April) (2011)   pp.319 - 321 Next article>>

Thermal conductivity and compressive strength anisotropy in vermiculite–ceramic composites with layered structure

Jung-Hye EOM1), Young-Wook KIM1), Doo-Hoa JEONG2) and Seung-Seok LEE2)
1) Functional Ceramics Laboratory, Department of Materials Science and Engineering, University of Seoul
2) Hybrid Materials Research Department, Research Institute of Industrial Science & Technology


  High strength vermiculite–ceramic composites with a layered structure were fabricated by adding cellulose fibers as a pore former and by simple uniaxial pressing and subsequent sintering. During uniaxial pressing, the cellulose fibers were aligned perpendicular to the pressing direction and formed an aligned pore structure during sintering. The thermal conductivity (0.81 W/m·K) and compressive strength (39 MPa) of the composite fabricated from 35 mass % vermiculate, 30 mass % SiO2, 10 mass % Al2O3 and 25 mass % cellulose fibers, measured perpendicular to the pressing direction, were higher than those (0.52 W/m·K and 28 MPa) measured parallel to the pressing direction. The anisotropy in both thermal conductivity and compressive strength was attributed to the microstructural anisotropy.


Keyword:
Refractory, Thermal insulator, Vermiculite, Layered structure

Received: January 24, 2011
Accepted: February 16, 2011 , Published online: April 01, 2011
Copyright (c) 2011 The Ceramic Society of Japan

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