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Crystallization and wetting of ZnO-AlO-BO-SiO glass-ceramic for sealing
to Kovar alloy |
| WU Mao, HE Xin-bo, SHEN Zhuo-shen, QU Xuan-hui |
| State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing; |
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Abstract A new type of ZnO-Al2O3-B2O3-SiO2 glass-ceramics seals to Kovar in electronic packaging was developed, whose coefficient of thermal expansion (CTE) and electrical resistance were 5.2 × 10-6/°C and over 1 × 1013 ?·cm, respectively. The major crystalline phases in the glass-ceramics seals were ZnAl2O4, ZnB2O4 and NaSiAl2O4. The dielectric resistance of the glass-ceramic could be remarkably enhanced through the control of the alkali metal ions into the crystal lattices. It was found that the crystallization happened first on the surface of the sample, leaving the amorphous phase in the inner parts, which makes the glass suitable for sealing. The glass-ceramic showed better wetting on the Kovar surface, and sealing atmosphere and temperature showed great effect on the wetting angle. Strong interfacial bonding was obtained, which was mainly attributed to the interfacial reaction between SiO2 and FeO or Fe3O4.
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Issue Date: 05 December 2008
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| 1 |
King B W, Tripp H P, Duckworth W H . Nature of adherence of porcelain enamels to metals. Journal of the American Ceramic Society, 1959, 42(11): 504–525.
doi:10.1111/j.1151-2916.1959.tb13567.x
|
| 2 |
Wallis G, Pomerantz D I . Field-assisted glass–metalsealing. Journal of Applied Physics, 1969, 40: 3946–3949.
doi:10.1063/1.1657121
|
| 3 |
Wallis G . Direct-currentpolarization during field-assisted glass-metal sealing. Journal of the American Ceramic Society, 1970, 53: 563–567.
doi:10.1111/j.1151-2916.1970.tb15967.x
|
| 4 |
Chern T S, Tsai H L . Wetting and sealing of interfacebetween 7056 Glass and Kovar alloy. MaterialsChemistry and Physics, 2007, 104(2–3): 472–478.
doi:10.1016/j.matchemphys.2007.04.012
|
| 5 |
Zanchetta A, Lefort P . Thermal expansion and adhesionof ceramic to metal sealings: case of porcelain-Kovar junctions. Journal of the European Ceramic Society, 1995, 15: 233–238.
doi:10.1016/0955-2219(95)93944-X
|
| 6 |
Zanchetta A, Lortholary P, Lefort P . Ceramic to metal sealings: interfacial reactions mechanismin a porcelain-Kovar junction. Journalof Alloys and Compounds, 1995, 228: 86–95.
doi:10.1016/0925-8388(95)01656-2
|
| 7 |
Dunn B . Field-assistedbonding of beta-alumina to metals. Journalof the American Ceramic Society, 1979, 62: 545–547.
doi:10.1111/j.1151-2916.1979.tb12726.x
|
| 8 |
Anthony T R . Anodic bonding of imperfect surfaces. Journal of Applied Physics, 1983, 54: 2419–2428.
doi:10.1063/1.332357
|
| 9 |
Adams R B, Pask J A . Fundamentals of glass-to-metalbonding: VII, wettability of iron by molten sodium silicate containingiron oxide. Journal of the American CeramicSociety, 1961, 44: 430–433.
doi:10.1111/j.1151-2916.1961.tb13751.x
|
| 10 |
Pask J A, Fulrath R M . Fundamentals of glass-to-metalbonding: VIII, nature of wetting and adherence. Journal of the American Ceramic Society, 1962, 45(12): 592–596.
doi:10.1111/j.1151-2916.1962.tb11067.x
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