Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1996-03-14
1998-06-02
Jones, Deborah
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
501 32, 501138, C04B 35468
Patent
active
057599351
ABSTRACT:
Powders of BaCO.sub.3, TiO.sub.2, ZnO, etc. are mixed to each other at a predetermined ratio of quantity, calcined in an atmospheric air at 90.degree.-120.degree. C., and pulverized to obtain a calcined powder having an average grain size from 1 to 3 .mu. m. 0.1 to 20 parts-by weight of a powder having an average grain size from 0.1 to 1.5 .mu.m comprising a glass having a transition point of not higher than 450.degree. C. obtained by mixing powders of Pb.sub.3 O.sub.4, SiO.sub.2, Na.sub.2 O, etc. to each other, melting and then pouring into water and pulverizing the thus obtained glass is admixed to the calcined powder. The mixture is dried, pelleted by adding a resin and the pellet powder is molded into a cylindrical shape, applied with CIP (Cold isotactic press), and the molding product after the treatment is sintered in an atmospheric air at 850.degree. to 1000.degree. C. to obtain a dielectric ceramic sintered at low temperature.
The resultant dielectric ceramic has high denseness and high unloaded Q value while maintaining .tau.f within a practical range.
REFERENCES:
patent: 5084424 (1992-01-01), Abe et al.
patent: 5128289 (1992-07-01), Wilson
patent: 5198396 (1993-03-01), Mizuno
patent: 5238887 (1993-08-01), Kato et al.
patent: 5296424 (1994-03-01), Wang et al.
Katagiri Hiroshi
Mizutani Hidetoshi
Okuyama Masahiko
Ozeki Hirofumi
Yoshida Noritaka
Jones Deborah
NGK Spark Co., Ltd.
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