Method for manufacturing laminated ceramic capacitor

Patent metadata

Field	Value
Publication number	US-9257233-B2
Application number	US-201313848775-A
Country	US
Kind code	B2
Filing date	Mar 22, 2013
Priority date	Jan 21, 2011
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A method of manufacturing a laminated ceramic capacitor having a dielectric ceramic which contains, as its main constituent, a perovskite-type compound containing Ca and Zr and optionally containing Sr, Ba, and Ti, and further contains Si, Mn, and Al, and when the total content of Zr and Ti is regarded as 100 parts by mol, the total content (100×m) of Ca, Sr, and Ba meets 1.002≦m≦1.100 in terms of parts by mol, the Si content n meets 0.5≦n≦10 in terms of parts by mol, the Mn content u meets 0.5≦u≦10 in terms of parts by mol, and the Al content w meets 0.02≦w≦4 in terms of parts by mol, m and n satisfying −0.4≦100(m−1)−n≦3.9.

First claim

The invention claimed is:

1. A method for manufacturing a laminated ceramic capacitor, the method comprising:
preparing a main constituent powder containing, as a main constituent thereof, a perovskite-type compound containing Ca and Zr;
preparing a Si compound, a Mn compound, an Al compound;
mixing the main constituent powder, the Si compound, the Mn compound, and the Al compound to form a ceramic slurry;
forming ceramic green sheets from the ceramic slurry;
stacking the ceramic green sheets and internal electrode layers to obtain an unfired laminated body; and
firing the unfired laminated body to obtain a laminated body with internal electrodes between dielectric layers,
wherein, for respective elements of the dielectric layers, when the total of Zr is regarded as 100 parts by mol,
the total content (100×m) of Ca meets 1.002≦m≦1.100 in terms of parts by mol,
the Si content n meets 0.5≦n≦10 in terms of parts by mol, the Mn content u meets 0.5≦u≦10 in terms of parts by mol, and
the Al content w meets 0.02≦w≦4 in terms of parts by mol,
m and n satisfying −0.4≦100(m−1)−n≦3.9.

2. The method for manufacturing a laminated ceramic capacitor according to claim 1 , wherein the perovskite-type compound further contains at least one selected from the group consisting of Sr, Ba, and Ti, and
when the total content of Zr and Ti is regarded as 100 parts by mol,
the total content (100×m) of Ca, Sr, and Ba meets 1.002≦m≦1.100 in terms of parts by mol,
a molar ratio s of Ti/(Zr+Ti) is 0≦s≦0.50,
a molar ratio y of Sr/(Ca+Sr+Ba) is 0≦y≦0.29, and
a molar ratio z of Ba/(Ca+Sr+Ba) is 0≦z≦0.29, y and z satisfying 0≦y+z≦0.29.

3. The method for manufacturing a laminated ceramic capacitor according to claim 2 , wherein a relationship of 0≦100(m−1)−n≦2.0 is satisfied.

4. The method for manufacturing a laminated ceramic capacitor according to claim 1 , wherein a relationship of 0≦100(m−1)−n≦2.0 is satisfied.

Assignees

• Murata Manufacturing Co

Inventors

• Nishimura Hitoshi
• Naito Masahiro

Classifications

• C04B2235/9669

  Resistance against chemicals, e.g. against molten glass or molten salts · CPC title

• H01G4/1236 Primary

  based on zirconium oxides or zirconates (H01G4/1263 takes precedence) · CPC title

• C04B35/49

  containing also titanium oxides or titanates · CPC title

• H01B3/12

  ceramics · CPC title

• H01G4/1245

  containing also titanates · CPC title