| 열가소성 고분자를 이용한 다공질 알루미나의 제조 |
| 이상진, 김해두 |
| 한국기계연구원 세라믹재료그룹 |
| Fabrication of Porous Al2O3 Ceramics Using Thermoplastic Polymer |
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| ABSTRACT |
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Porous alumina ceramics with aligned plate-shaped pores were fabricated by using thermoplastic microsphere in order to show the anisotropy in thermal conductivity. The mixed powder of alumina and microsphere was pressed under 15 MPa till 20$0^{circ}C$ to deform polymer into platelet-shape and sintered at 1,00$0^{circ}C$ for 1 h. The sintered specimen with 10 wt% microsphere has 45.3% porosity and the bending strength of 44 MPa. The microstructural investigation confirmed the pore structure of platelet-shape, the thermal conductivities for vertical and parallel directions are 3.803 W/mK and 7.818 W/mK, respectively, the ratio between two directions exceeds 2. ꤠ 돀遠잖⨀ 塨 |
| Key words:
Porous alumina, Plate-shaped pore, Anisotropy in thermal conductivity, Microsphere |
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