• Journal of Powder Materials
• /
• v.13 no.6 s.59
• /
• pp.387-395
• /
• 2006

본고에서는 고유한 원자구조에 기인한 우수한 특성으로 인해 구조재료 및 기능재료로서 그 활용이 기대되고 있는 벌크 아몰퍼스 소재에 있어 온간압출, 온간압연, 방전 플라즈마 소결(Spark Plasma Sintering)등 과냉각액체온도구간에서의 점성유동을 이용한 고화성형 공정의 최근 기술동향에 대해 간략히 소개했다.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1999.11a
• /
• pp.43-43
• /
• 1999

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 2001.04a
• /
• pp.38-38
• /
• 2001

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 1998.10b
• /
• pp.33-33
• /
• 1998

• Proceedings of the Korean Ceranic Society Conference
• /
• 2004.04b
• /
• pp.27.3-27.3
• /
• 2004

• Proceedings of the KWS Conference
• /
• 1999.05a
• /
• pp.100-102
• /
• 1999

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 1999.10a
• /
• pp.22-22
• /
• 1999

• Proceedings of the Korean Ceranic Society Conference
• /
• 2002.10a
• /
• pp.77.2-77
• /
• 2002

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2002.11a
• /
• pp.135-135
• /
• 2002

• Journal of the Korean Ceramic Society
• /
• v.39 no.12
• /
• pp.1183-1189
• /
• 2002

In order to develope the porous alumina ceramics with high strength, the pore characteristics and compressive strength were investigated in terms of relation to the conditions of spark-plasma sintering and the contents of graphite as a pore precursor. Porous alumina bodies were successfully prepared by spark-plasma sintering and burning out graphite in air. High porous bodies were fabricated by sintering at 1000${\circ}C$ for 3 min under a pressure of 30 MPa, heating rate of 80${\circ}C$/min and on-off pulse type of 12:2. For example, alumina bodies prepared by the addition of 10∼30 vol% graphite showed high porosity of 50∼57%. Also, the open porosity increased with graphite content. The relationship between pore characteristics and graphite contents could be explained by percolation model depending on cluster number and size. Porous alumina bodies prepared by the addition of 10∼30 vol% graphite showed the high compressive strength of 55∼200 MPa. This great improvement in strength was considered to be mainly due to the spark-plasma discharges and the self-heating action between particles.