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J. Korean Ceram. Soc. > Volume 39(12); 2002 > Article
Journal of the Korean Ceramic Society 2002;39(12): 1183.
doi: https://doi.org/10.4191/kcers.2002.39.12.1183
방전 플라즈마 소결법에 의한 다공성 알루미나 세라믹스의 제조
신현철, 조원승1, 신승용2, 김준규3
1인하대학교 재료공학부
3인하대학교 소재연구소
Fabrication of Porous Alumina Ceramics by Spark Plasma Sintering
Hyun-Cheol Shin, Won-Seung Cho1, Seung-Yong Shin2, Jun-Gyu Kim3
Korea Institute of Construction Technology
1School of Materials Science and Engineering, Inha University
2Korea Institute of Industrial Technology
3Institute of Advanced Materials, Inha University
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.
Key words: Porous ceramics, Alumina, Spark plasma sintering, Porosity
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