배향된 판상 기공구조를 통해 열전도도 이방성을 갖는 다공질 재료의 제조

Fabrication of Porous Materials having an Anisotropic Thermal Conductivity through the Alignment of Plate-shaped Pores

  • 윤중열 (한국기계연구원 재료연구부 세라믹재료그룹) ;
  • 송인혁 (한국기계연구원 재료연구부 세라믹재료그룹) ;
  • 김해두 (한국기계연구원 재료연구부 세라믹재료그룹)
  • 발행 : 2003.12.30

초록

In order to fabricate porous materials having an anisotropic thermal conductivity by aligning plate-shaped pores structure, alumina powder (AM-21, mean particle size $4\mum$) and flake crystalline graphite was used. The aligned pore structure was realized using multi-pressing process. Degree of pore orientation increased with the number of pressing and thermal conductivity, parallel to the pressing direction, decreased with the number of pressing. Thermal conductivity decreased significantly to the addition of 30vol% crystalline graphite, however, in the case of 60vol%, thermal conductivity did not decrease significantly due to the breakage of crystalline graphite. An anisotropy of the thermal conductivity increased with the content of crystalline graphite up to 30vol%. Graded pore structure was fabricated by controlling the content and size of crystalline graphite, which provides, possibly, the enhancement in mechanical strength and thermal insulation properties of the insulating bricks.

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