폴리머 고착공정을 통한 저온소성기판용 Anorthite의 제조

김광석; 이충효; 이상진; Gwang-Seok Kim; Chung-Hyo Lee; Sang-Jin Lee

Korean Journal of Materials Research, Vol.12, No.8, 595-599, August, 2002

DOI10.3740/MRSK.2002.12.8.595 Export Citation

폴리머 고착공정을 통한 저온소성기판용 Anorthite의 제조

Fabrication of Anorthite for Low-Firing Ceramic Substrate by PVA Steric-Entrapment Route

김광석, 이충효, 이상진^†

목포대학교 신소재공학과

Gwang-Seok Kim, Chung-Hyo Lee, and Sang-Jin Lee^†

Department of Advanced Materials Science and Engineering, Mokpo National University, Muan-gun, 534-729, Korea

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A homogeneous and stable, amorphous-type, anorthite (CaO Al 2 O 3 2SiO 2 )powder was synthesized by an organic-inorganic steric entrapment route. Polyvinyl alcohol ( PVA) was used as an organic carrier for the precursor ceramic gel. The PVA content, its degree of polymerization and type of silica sol had a significant influence on the calcination and crystallization behavior of the precursors. For densifiction and crystallization at low temperature, porous and soft, amorphous-type anorthite powder was planetary milled for 20h. The milled powder crystallized to stable anorthite phase and densified to a relative density of 94% below 1000 ? C . In the development of crystalline phases of the planetary milled powder, omisteinbergite phase was unusually observed at 900 ? C , and then anorthite was observed at 950 ? C . The sintered anorthite had a thermal expansion coefficient of 4.6 \times10 ?6 / ? C and a dielectric constant of 7.5 at 1 MHz. Finally, the anorthite synthesized by the new process is expected to be an useful material for low-firing ceramic substrate.

Keywords:low-firing;anorthite;PVA;polymerization;steric entrapment

[References]

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[1] Gdula RA, Am. Ceram. Soc. Bull., 50(6), 555 (1971)

[2] Kobayashi Y, Kato E, J. Am. Ceram. Soc., 77(3), 833 (1994)

[3] Zelinski BJJ, Fabes BD, Uhlmann DR, J. Non-Crystalline Solids, 82, 307 (1986)

[4] Gulgun MA, Nguyen MH, Kriven WM, Ceramic Transactions Vol. 62, p.57, American ceramic society, Weaterville, OH, USA, (1995) (1995)

[5] Gulgun MA, Nguyen MH, Kriven WM, J. Am. Ceram. Soc., 82(3), 556 (1999)

[6] Lee SJ, Kriven WM, J. Am. Ceram. Soc., 81(10), 2605 (1998)

[7] Lee SJ, Benson EA, Kriven WM, J. Am. Ceram. Soc., 82(8), 2049 (1999)

[8] Nguyen MH, Lee SJ, Kriven WM, J. Mater. Res., 14(8), 3417 (1999)

[9] Pechini M, U.S.Pat. No.3330697, July 11, (1967) (1967)

[10] Budd D, Payne DA, Mater. Res. Soc. Symp. Proc., 31, 239 (1984)

[11] Baik YH, Lee CK, J. Kor. Ceram. Soc., 20(2), 153 (1983)

[12] Kim HY, Lee JA, Kim JJ, J. Kor. Ceram. Soc., 36(11), 1243 (1999)

[13] Cutler IB, J. Am. Ceram. Soc., 52(14), 14 (1969)

[14] Boudchicha MR, Achour S, Harabi A, J. Mater. Sci. Lett., 20(3), 215 (2001)

[15] Iwata Y, Saito S, Satoh Y, Okamura F, in Intermicroelectric Conference, ISHM, Reston, VA, (1986) p.65 (1986)