| 학회 | 한국재료학회 |
| 학술대회 | 2018년 봄 (05/16 ~ 05/18, 삼척 쏠비치 호텔&리조트) |
| 권호 | 24권 1호 |
| 발표분야 | 3. 나노입자 합성 및 응용-오거나이저: 배성환 교수(경남대) |
| 제목 | Fabrication of transparent MgAl2O4 ceramics from commercial nanopowder |
| 초록 | In order to realize optical transparency of polycrystalline ceramics, total volume and size of porosity inside ceramics should be minimized according to the Rayleigh-Debye-Gans scattering theory. Owing to the advantages such as high sinterability and small pore size, nanopowders with high purity are generally used as raw materials for the fabrication of transparent ceramics. However, because of the high specific surface area of the nano powder, high degree of agglomeration and friction between particles are inevitable. Therefore, a sophisticated ceramic processing to overcome such intrinsic obstacles must be applied. In this study, highly transparent MgAl2O4 spinel was fabricated using commercial nanopowder which has 30m2/g of surface area (primary pariticle size = ~55nm). Microfluidization process was confirmed to solve the agglomeration problem of nanopowder, and slip-casting of microfluidized slurry was proved to be effective on the homogeneity of the green compact. Selected air-sintered samples were HIPed under 180MPa Ar atmosphere to achieve transparent MgAl2O4. Microstructural analysis of the green bodies, the pre-sintered bodies, and the hot isostatic pressed bodies of the prepared MgAl2O4 ceramics revealed that the slurry dispersion should be controlled to a high level in order to suppress scattering sources such as pores and microcracks, which affect the in-line transmittance of visible light. |
| 저자 | 김하늘, 고재웅, 박영조, 김해두 |
| 소속 | 재료(연) |
| 키워드 | <P>Transparent; MgAl<SUB>2</SUB>O<SUB>4</SUB>; Spinel; Nanopowder; Microfluidization</P> |
