수용액 매체로부터 코디어라이트 졸의 제조 및 코디어라이트 세라믹스의 소결거동

김재원; 김현철; 김두현; 서성문; 조창용; 최승주; 김재철; J.W. Kim; H.C. Kim; D.H. Kim; S.M. Seo; C.Y. Jo; S.J. Choe; J.C. Kim

Korean Journal of Materials Research, Vol.10, No.3, 233-240, March, 2000

Export Citation

수용액 매체로부터 코디어라이트 졸의 제조 및 코디어라이트 세라믹스의 소결거동

Preparation of Cordierite sols in Aqueous Media and Sintering Behavior of Cordierite Ceramics

김재원, 김현철, 김두현 , 서성문 , 조창용 , 최승주, 김재철¹

한국기계연구원 내열재료그룹
¹전력연구원 발전연구실

J.W. Kim, H.C. Kim, D.H. Kim , S.M. Seo , C.Y. Jo , S.J. Choe, and J.C. Kim¹

Korea Institute of Machinery and Materials, 66 Sangnam-dong, Changwon, Kyungnam 641-010, Korea
¹Korea Electric Power Research Institute, 103-16 Munji, Yusung, Taejon 305-380, Korea

초록

소결 촉진제 첨가없이 치밀한 코디어라이트 세라믹스를 얻기 위해 Mg-Al-Si계의 열적거동을 검토하였다. 수용액 매체에서 코디어라이트 현탁액의 분산안정성을 ESA를 이용하여 조사하였으며, 코디어라이트 졸의 응집 방지와 분산성을 부여하기 위해 2N HNO 3 와 2N NH 4 OH 용액으로 pH 1.03과 pH 8.30로 조절하였다. pH 8.30인 코디어라이트 졸을 150 ? C 에서 12시간 건조한 시료에서 magnesium-aluminum-silicate 복합 겔이 존재하였다. 평형상태의 코디어라이트 겔의 결정화는 1300 ? C 이상의 소결 온도에서 존재하였으며, 1300 ? C 이하의 조건에서는 μ?cordierite(Mg 2 Al 4 Si 5 O 1 8) , spine( MgAl 2 O 4 ) 및 mullite( Al 6 Si 2 O 13 )와 같은 다양한 준안정상이 복합적으로 혼재하였다. pH 1.03과 pH 8.30로 조절된 현탁액에서 코디어라이트 겔의 핵반응은 유사하게 일어났으나, 치말화거동은 졸의 pH에 상당한 차이를 보였다. pH 1.03인 졸 보다 pH 8.30인 졸의 치밀화가 더욱 진전되었다.

In order to fabricate dense cordierite ceramics without sintering aid, thermal behavior of Mg-Al-Si compounds during sintering was investigated. The dispersibility of cordierite suspension in aqueous media was measured by ESA(electrokinetic sonic amplitude). To prevent aggregation and insufficient dispersion of the cordierite sol, the pH of the suspension was controlled to 1.03 and 8.30 by adding 2NHNO 3 and 2NNH 4 OH , respectively. Magnesium-aluminum-silicate complex gel coexisted in the specimen which has been gelled at 150 ? C fir 12 hours, however several metastable phase such as μ?cordierite(Mg 2 Al 4 Si 5 O 18 ),spine(MgAl 2 O 4 )andmullite(Al 6 Si 2 O 13 ) existed below 1300 ? C Nucleation rates of the two suspension were similar, but densification of the gel was sensitive to the pH of the sol. Densification of the sol with the pH of 8.3 was more pronounced than that of the sol with pH of 1.63.

Keywords:cordierite;sol-gel;dispersibility;metastable;nucleation;densification

[References]

Bridge DR, Holland D, McMillan PW, Glass Technology, 26(6), 286 (1985)
McMillan PW, Glass Ceramics(2nd Ed.)/ Academic Press, pp.261-262, 1964 (1964)
Suzuki H, J. Ceram .Soc. Jpn., 95(2), 163 (1987)
Nogami M, Ogawa S, Nagsaka K, J. Mater. Sci. Jpn., 24, 4339 (1989)
Von Gugel E, Ber. Dtsch. Keram. Ges., 44, 547 (1967)
Einarsrud MA, Pedersen S, Larsen E, Grande T, J. Euro. Ceram. Soc., 19, 389 (1999)
Kim YB, Kim HT, Lee ES, J. Kor. Ceram. Soc., 32(1), 45 (1995)
Jais US, Lee WE, James PF, J. Non-Cryst. Solids., 194, 213 (1996)
Ryu SC, Kim HR, Kim K, Park HC, J. Kor. Ceram. Soc., 31(3), 291 (1994)
Sumi K, Kobayashi Y, Kato E, J. Am. Ceram. Soc., 81(1), 1029 (1998)
Sumi K, Kobayashi Y, Kato E, J. Am. Ceram. Soc., 82(3), 783 (1999)
Roosen A, Bowen HK, J. Am. Ceram. Soc., 71(111), 970 (1988)
Aksay IA, Schilling CH, Hench LL(ed.), Ulrich DR(ed.), Ultrastructure Processing of Ceramics, Glasses and Composites/ Jhon Wiley and Sons, Inc., pp.439, 1984 (1984)
O'Brien RW, J. Fluid Mech., 212, 81 (1990)
Kim JW, Kim DH, Seo SM, Jo CY, Choe SJ, Kim JC, Kor. J. Mat. Res., 9(9), 865 (1999)
Kim JW, Kim DH, Seo SM, Jo CY, Choe SJ, Kim JC, Park YK, Kor. J. Mat. Res., 9(12), 1188 (1999)
Hart LD, Alumina Chemicals/ American Ceramic Society, pp.263-267, 1990 (1990)
Han MH, Park KC, J. Kor. Ceram. Soc., 27(6), 777 (1990)
Hart LD, Alumina Chemicals/ American Ceramic Society, pp.13-20, 1990 (1990)
Cahn RW, Bloor D, et al., The Encyclopedia of Advanced Materials/ v.4, pp.2551-2553
Singer GM, Tomogawa M, Phys. Chem. Glasses, 30(3), 86 (1989)
Martta, Buri A, Branda A, Saiello F S, Advances in Ceramics/ American Ceramic Society, v.4, pp.146-152, 1982 (1982)
Sacks MD, Tseng TY, J. Am. Ceram. Soc., 67(8), 526 (1984)

[Referenced By]

[Related Articles]

[1] Bridge DR, Holland D, McMillan PW, Glass Technology, 26(6), 286 (1985)

[2] McMillan PW, Glass Ceramics(2nd Ed.)/ Academic Press, pp.261-262, 1964 (1964)

[3] Suzuki H, J. Ceram .Soc. Jpn., 95(2), 163 (1987)

[4] Nogami M, Ogawa S, Nagsaka K, J. Mater. Sci. Jpn., 24, 4339 (1989)

[5] Von Gugel E, Ber. Dtsch. Keram. Ges., 44, 547 (1967)

[6] Einarsrud MA, Pedersen S, Larsen E, Grande T, J. Euro. Ceram. Soc., 19, 389 (1999)

[7] Kim YB, Kim HT, Lee ES, J. Kor. Ceram. Soc., 32(1), 45 (1995)

[8] Jais US, Lee WE, James PF, J. Non-Cryst. Solids., 194, 213 (1996)

[9] Ryu SC, Kim HR, Kim K, Park HC, J. Kor. Ceram. Soc., 31(3), 291 (1994)

[10] Sumi K, Kobayashi Y, Kato E, J. Am. Ceram. Soc., 81(1), 1029 (1998)

[11] Sumi K, Kobayashi Y, Kato E, J. Am. Ceram. Soc., 82(3), 783 (1999)

[12] Roosen A, Bowen HK, J. Am. Ceram. Soc., 71(111), 970 (1988)

[13] Aksay IA, Schilling CH, Hench LL(ed.), Ulrich DR(ed.), Ultrastructure Processing of Ceramics, Glasses and Composites/ Jhon Wiley and Sons, Inc., pp.439, 1984 (1984)

[14] O'Brien RW, J. Fluid Mech., 212, 81 (1990)

[15] Kim JW, Kim DH, Seo SM, Jo CY, Choe SJ, Kim JC, Kor. J. Mat. Res., 9(9), 865 (1999)

[16] Kim JW, Kim DH, Seo SM, Jo CY, Choe SJ, Kim JC, Park YK, Kor. J. Mat. Res., 9(12), 1188 (1999)

[17] Hart LD, Alumina Chemicals/ American Ceramic Society, pp.263-267, 1990 (1990)

[18] Han MH, Park KC, J. Kor. Ceram. Soc., 27(6), 777 (1990)

[19] Hart LD, Alumina Chemicals/ American Ceramic Society, pp.13-20, 1990 (1990)

[20] Cahn RW, Bloor D, et al., The Encyclopedia of Advanced Materials/ v.4, pp.2551-2553

[21] Singer GM, Tomogawa M, Phys. Chem. Glasses, 30(3), 86 (1989)

[22] Martta, Buri A, Branda A, Saiello F S, Advances in Ceramics/ American Ceramic Society, v.4, pp.146-152, 1982 (1982)

[23] Sacks MD, Tseng TY, J. Am. Ceram. Soc., 67(8), 526 (1984)