Coating processes – Electrical product produced – Metal coating
Patent
1996-04-22
1997-09-30
Bell, Mark L.
Coating processes
Electrical product produced
Metal coating
427 77, 264 61, 264 66, 501137, 501138, B05D 512, C04B 4188, C04B 35468
Patent
active
056723784
ABSTRACT:
A ceramic powder mixture is made by combining from 96 to 98 mole percent of precursors of a stoichiometric barium zirconate titanate (BZT) wherein zirconium amounts to from 13.5 to 15.0 mole percent, and adding from 0.5 to 1.5 mole percent niobium or lanthanum, from 1.2 to 2.6 weight percent of a cadmium silicate sintering flux, essentially no lead, and from zero to 2 mole % of an alkaline earth metal to obtain in the powder mixture a ratio (A/B) of the large cations (A) to the small cations (B) in the range from 1.024 to 1.035. The mixture is calcined to obtain a powder comprised of agglomerates of essentially identical composition within the ranges given above. This powder of agglomerates may then be formed into a compact body that is sintered and fired to maturity at 1100.degree. C. to produce a mature dielectric ceramic body meeting the Y5V standard and having a dielectric constant greater than 10,000 at the Curie temperature.
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D. Hennings and G. Rosenstein, "Temperature Stable Dielectric Based on Chemically Inhomogeneous BaTiO3", J. Am. Cer. Soc., vol. 67, No. 4, pp. 249-254 Apr. 1984.
Bheemineni Veerabhadrarao
Maher Galeb H.
Bell Mark L.
MRA Laboratories, Inc.
Troilo Louis M.
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