Powders used for producing Ni-Cu-Zn system ferrite ceramics sintered body and method for manufacturing the same
AssigneeNGK Insulators, Ltd.
InventorsShuichi Ozawa, Naoto Ohira, Kouichi Kondou
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Abstract
The first invention relates to powders for producing a Ni—Cu—Zn system ferrite ceramics sintered body, comprising ferrite calcined powders and NiO powders, wherein the specific surface area of said ferrite calcined powders is within the range of 4.0 m2/g to 14.0 m2/g, the spinel included in said ferrite calcined powders is such that Ni does not solve, the composition of said spinel is such that Fe2O3 is within the range of 49.0 mol % to 60.0 mol % and the remaining comprises CuO and ZnO, and the ratio of ZnO relative to CuO in mole percent is within the range of 1.0 to 4.0.
Claims6
A powder for producing a Ni—Cu—Zn system ferrite ceramic sintered body, said powder comprising:
- a ferrite calcined powder;
- and
- an NiO powder;
- wherein a specific surface area of said ferrite calcined powder is within the range of 4.0 m2/g to 14.0 m2/g;
- and
- wherein a spinel composition of said ferrite calcined powder is such that Ni does not solve in said spinel composition, and the composition of said spinel is such that Fe2O3 is within the range of 49.0 mol % to 60.0 mol % and the remaining comprises CuO and ZnO, and a ratio of ZnO relative to CuO in mol % is within the range of 1.0 to 4.0.
A method for manufacturing a powder used for producing a Ni—Cu—Zn system ferrite ceramics sintered body, the method comprising:
- a step of mixing Fe2O3 powders, CuO powders and ZnO powders, except for NiO powders, to obtain a mixed powder;
- a step of calcining said mixed powder obtained by said mixing step to obtain a ferrite calcined body;
- and
- a step of milling said ferrite calcined body obtained by said calcination step to obtain a ferrite calcined powder and, at the same time, mixing said ferrite calcined powder with an NiO powder;
- wherein a specific surface area of said ferrite calcined powder obtained by said milling and mixing step is within the range of 4.0 m2/g to 14.0 m2/g;
- and
- wherein a spinel composition of said ferrite calcined powder is such that Ni does not solve, the composition of said spinel being such that Fe2O3 is within the range of 49.0 mol % to 60.0 mol % and the remaining comprises CuO and ZnO, and a ratio of ZnO relative to CuO in mole percent is within the range of 1.0 to 4.0.
Dependencies are inferred from the claim text.