Metal electrode of ceramic capacitor and method of forming the same

Patent metadata

Field	Value
Publication number	US-12456578-B2
Application number	US-202318173799-A
Country	US
Kind code	B2
Filing date	Feb 24, 2023
Priority date	Nov 18, 2022
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A metal electrode of a ceramic capacitor and a method of forming the same are provided. The method includes mixing metal powders and a barium titanate organic-precursor to obtain precursor powders; adding an adhesive to the precursor powders to obtain a metal slurry; performing a molding process to the metal slurry to obtain a film material; performing a binder burn-out process to the film material to obtain a degumming film; and performing a sintering process to the degumming film to obtain the metal electrode. By mixing specific amount of barium titanate organic-precursor with the metal powders, the barium titanate metallic organic-precursor can be transformed to barium titanate in the following process, and barium titanate can be dispersed between the metals homogeneously. Therefore, electrode continuity can be increased.

First claim

What is claimed is:

1. A method of forming a metal electrode of a ceramic capacitor, comprising:
mixing metal powders, a metal oxide organic-precursor and a barium titanate organic-precursor to obtain precursor powders, wherein based on an amount of the metal powders as 100 wt %, an amount of the barium titanate organic-precursor is 3 wt % to 15 wt %, and based on an amount of the barium titanate organic-precursor as 100 mol %, an amount of the metal oxide organic-precursor is 0.5 mol % to 5 mol %;
adding an adhesive to the precursor powders to obtain a metal slurry;
performing a molding process to the metal slurry to obtain a film material;
performing a binder burn-out process to the film material to obtain a degumming film, wherein the binder burn-out process makes the barium titanate organic-precursor transform to barium titanate; and
performing a sintering process to the degumming film to obtain the metal electrode.

2. The method of claim 1 , wherein the step of mixing the metal powders and the barium titanate organic-precursor further comprises:
adding a metal organic-precursor, wherein based on the amount of the metal powders as 100 wt %, an amount of the metal organic-precursor is 3 wt % to 15 wt %.

3. The method of claim 2 , wherein the metal organic-precursor comprises at least one of Ni, Sn, Cu, Ga, In, Tl and Sb.

4. The method of claim 2 , wherein a method for producing the metal organic-precursor comprises the following steps:
mixing an organic acid and an organic amine to obtain a mixing solution; and
adding an organic acid metal salt into the mixing solution to obtain the metal organic-precursor.

5. The method of claim 1 , wherein the metal oxide organic-precursor includes at least one of Mg, Dy, V, Cr, Mn, Fe, Co, Li, Ho, Y, Tb and Ca.

6. The method of claim 1 , wherein a method for producing the barium titanate organic-precursor comprises following steps:
heating an organic acid to a temperature of 60° C. to 80° C. to obtain a high-temperature organic acid;
adding barium carbonate powders into the high-temperature organic acid to obtain a barium carbonate-organic acid solution; and
adding tetrabutyl titanate into the barium carbonate-organic acid solution to obtain the barium titanate organic-precursor.

7. The method of claim 1 , wherein the binder burn-out process comprises heating the film material at a temperature of 150° C. to 900° C.

8. The method of claim 1 , wherein the sintering process comprises heating the degumming film at a temperature of 1100° C. to 1220° C.

9. A method of forming a metal electrode of a ceramic capacitor, comprising:
mixing metal powders, a metal organic-precursor and a barium titanate organic-precursor to obtain precursor powders, wherein based on an amount of the metal powders as 100 wt %, an amount of the barium titanate organic-precursor is 3 wt % to 15 wt %, and an amount of the metal organic-precursor is 3 wt % to 15 wt %;
heating the precursor powders to a temperature of 150° C. to 900° C. to obtain a metal electrode film, wherein the metal electrode film comprises the metal powders coated by barium titanate particles, and the barium titanate particles are transformed from the barium titanate organic-precursor; and
performing a sintering process to the metal electrode film to obtain the metal electrode.

10. The method of claim 9 , wherein the metal organic-precursor comprises Ni, Sn, Cu, Ga, In, Tl, Sb or combination thereof.

11. The method of claim 9 , wherein the metal organic-precursor transforms to metal when heating the precursor powders.

12. The method of claim 9 , wherein the step of mixing the metal powders, the metal organic-precursor and the barium titanate organic-precursor further comprises:
adding a metal oxide organic-precursor, wherein based on an amount of the barium titanate organic-precursor as 100 mol %, an amount of the metal oxide organic-precursor is 0.5 mol % to 5 mol %.

13. The method of claim 12 , wherein the metal oxide organic-precursor includes Mg, Dy, V, Cr, Mn, Fe, Co, Li, Ho, Y, Tb, Ca or combination thereof.

14. The method of claim 12 , wherein the metal oxide organic-precursor transforms to metal oxide when heating the precursor powders.

15. The method of claim 12 , wherein the sintering process comprises heating the metal electrode film at a temperature of 1100° C. to 1220° C.

Assignees

• Yageo Corp
• Univ Nat Cheng Kung

Inventors

• Hsiang Hsing-I
• Yen Fu-Su
• Huang Chi-Yuen
• Lee Chun-Te
• Yang Kai-Hsun
• Wang Shih-Ming

Classifications

• C22C1/05

  Mixtures of metal powder with non-metallic powder (C22C1/08 takes precedence) · CPC title

• C22C1/0433

  Nickel- or cobalt-based alloys · CPC title

• B22F1/107

  containing organic material comprising solvents, e.g. for slip casting · CPC title

• B22F7/04

  with one or more layers not made from powder, e.g. made from solid metal · CPC title

• B22F3/23

  involving a self-propagating high-temperature synthesis or reaction sintering step {(making cermets by reaction sintering C22C1/051)} · CPC title