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Aqueous tape casting of microwave ceramic BaO • La2O3 • 4.7TiO2

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Abstract

An aqueous-based slip for tape-casting BaO • La2O3 • 4.7TiO2 ceramic sheets was studied that is suitable for substrates of microwave devices. Two separate dispersants, Na4P2O7 (S2) and CH3(CH2)4SO3Na, combined with poly(vinyl alcohol) and poly(ethylene glycol), were used as slip additives. The zeta potential, particle size distribution, viscosity (of the slip), tensile strength and density (of green tapes), sintered density, microstructures and microwave dielectric properties (of sintered substrates) were characterized, and their dependence on the additives were analysed. S2 shows a better dispersion function and leads to a higher density of the tapes. During the sintering, the S2 liquid on grain boundaries hindered the grain growth and the formation of second phase. The dispersant-dependent microstructures of the substrates show strong influences on the dielectric properties.

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Authors
  1. Cheng Chung Lee
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  2. Pang Lin
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Lee, C.C., Lin, P. Aqueous tape casting of microwave ceramic BaO • La2O3 • 4.7TiO2 . Journal of Materials Science: Materials in Electronics 9, 409–417 (1998). https://doi.org/10.1023/A:1008969102414

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