학술논문
다단 가압 진공 주입 성형에 의한 알루미나 소지의 제조
Document Type
Dissertation/ Thesis
Source
Subject
Language
Korean
Abstract
반도체 및 LCD 제조장치의 부재로서 알루미나 세라믹스는 가장 기본적인 소재이다. 최근 대형 세라믹스 부재를 요구하고 있지만 세라믹스의 대형화는 여전히 많은 문제를 가지고 있다. 냉간 정수압 성형, 석고 몰드 주입 성형, 및 가압 여과 성형과 같은 종래의 세라믹 성형법은 장비의 고가, 밀도구배 발생 및 건조 중에 수축 차이와 같은 단점으로 인하여 대형이며 두꺼운 세라믹 판재를 제조하기에 적절하지 않다. 슬립을 주형실로 가압함과 동시에 주형실의 분산매(물)를 진공 흡입하는 다단 가압-진공 주입 성형(step pressure- vacuum slip casting)을 적용하여 이러한 문제를 해결할 수 있었다. 이 방법에 의해 균열 없고 균질한 밀도의 110 x 110 x 20 mm 알루미나 판재를 제조할 수 있었고, 다른 세라믹 소재를 제조할 수 있는 가능성을 제시하였다.
The alumina ceramics is one of the basic materials as the semi-conductor and LCD equipment. Recently it is demanded as large size in the market, but it has still many problems on manufacturing large size. Conventional methods for preparing ceramic bodies, such as cold isostatic pressing, gypsum-mold slip casting, and filter pressing are not completely suitable for fabricating large and thick ceramic plates, because of disadvantages such as the high cost of equipment, formation of density gradient, and differential shrinkage during drying. These problems could be avoided by employing step pressure-vacuum hybrid slip casting in which consolidation occurs not only by the compression of the slip in casting room, but also by vacuum sucking of the dispersion medium (water) around the mold. This method enabled us to fabricate a 110 × 110 × 20 mm alumina plate without cracks and with homogeneous density, and the possibility of extending the method to fabricate other ceramic products appears to be promising.
The alumina ceramics is one of the basic materials as the semi-conductor and LCD equipment. Recently it is demanded as large size in the market, but it has still many problems on manufacturing large size. Conventional methods for preparing ceramic bodies, such as cold isostatic pressing, gypsum-mold slip casting, and filter pressing are not completely suitable for fabricating large and thick ceramic plates, because of disadvantages such as the high cost of equipment, formation of density gradient, and differential shrinkage during drying. These problems could be avoided by employing step pressure-vacuum hybrid slip casting in which consolidation occurs not only by the compression of the slip in casting room, but also by vacuum sucking of the dispersion medium (water) around the mold. This method enabled us to fabricate a 110 × 110 × 20 mm alumina plate without cracks and with homogeneous density, and the possibility of extending the method to fabricate other ceramic products appears to be promising.