Fine grained batio3 powder mixture and method for making

Details Fine grained batio3 powder mixture and method for making Fine grained batio3 powder mixture and method for making

C - Chemistry, Metallurgy

04

B

31/98

C04B 35/46 (2006.01) C04B 35/468 (2006.01) H01G 4/12 (2006.01)

Patent

CA 2033582

FINE GRAINED BaTiO3 POWDER MIXTURE AND METHOD FOR MAKING Abstract of the Disclosure Disc and multilayer ceramic capacitors having a fine grained barium titanate body exhibit a high dielectric constant and a smooth (X7R) temperature coefficient of capacitance. Such capacitors are made by mixing barium titanate powder of less than 0.7 micron average particle size, with around 2 weight percent of a cadmium silicate flux serving as a reactivity and sintering promoter and one weight percent Nb2O5 serving as a reactivity and sintering inhibitor. After preparing a green body of this mixture, the body is sintered at about 1100°C. A powder mixture for manufacture of such capacitors includes mixing powders of the three above-described materials, mildly sintering the powder mixture and if necessary comminuting the calcine to produce a ceramic powder of agglomerates of the start powders, each agglomerate having the same composition as did the precursor mixture.

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