Microwave dielectric ceramics and method for manufacturing...

Details Microwave dielectric ceramics and method for manufacturing... Microwave dielectric ceramics and method for manufacturing...

2011-04-19

2011-04-19

Lorengo, Jerry (Department: 1731)

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

C501S134000, C264S666000

Reexamination Certificate

active

07928030

ABSTRACT:
A method for manufacturing microwave dielectric ceramics has the steps of: mixing multiple A-metal compounds and sintering multiple A-metal compounds between 1350˜1450° C. for 2˜4 hr to make a first component Ba5+y(Nb1−kMnk)4O15; mixing and sintering multiple B-metal compounds to make a second component Ba1+zNb2O6; and mixing the first component Ba5+y(Nb1−kMnk)4O15, the second component Ba1+zNb2O6and at least one sintering aid to make a third component (1−x)Ba5+y(Nb1−kMnk)4O5-xBa1+zNb2O6; wherein x, y, z and k are molar fractions and 0≦x<1, 0<y≦0.3, 0≦z≦0.3, 0≦k≦0.1; and the at least one sintering aid is 0.3˜3 wt %. The microwave dielectric ceramics of (1−x)Ba5+y(Nb1−kMnk)4O15-xBa1+zNb2O6have superior microwave properties, low sintering temperature, simple chemical composition and manufacturing requirements applicable to low temperature co-sintered ceramic systems so no re-tooling is required.

REFERENCES:
patent: 2003/0158031 (2003-08-01), Isuhak et al.
patent: 101050101 (2007-10-01), None
Kim et al., “Degradation Mechanism of Dielectric Loss in Barium Niobate Under a Reducing Atmosphere”, published Oct. 2006, Journal of the American Society, vol. 89, NOo 10, (pp. 3302-3304.

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