Terminal electrode compositions for multilayer ceramic capacitors

• US 20040144205A1
• Filed: 09/25/2003
• Published: 07/29/2004
• Est. Priority Date: 01/24/2003
• Status: Active Grant

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Matsuno, Hisashi, Soshi, Hiroyuki
• Granted Patent: US 7,083,744 B2
• Time in Patent Office: Days
• US Class Current: 75/252
• CPC Class Codes: H01G 4/2325 characterised by the material of the terminals

Abstract

The present invention relates to terminal electrode compositions for multilayer ceramic capacitors. More specifically, it relates to terminal electrode compositions for multilayer ceramic capacitors which have a metal oxide component selected from SnO₂, V₂O₅ and MoO₃. The compositions can be fired at a low temperature in a nitrogen atmosphere.

Claims

1. An electrically conductive paste composition, based on total composition, comprising 45.0 to 85.0 wt % of base metal particles selected from copper powder, nickel powder, copper-nickel alloy powder and mixtures thereof;

5 to 15 wt % glass frit; and

0.1 to 10 wt % metal oxide particles selected from SnO₂, V₂O₅ and MoO₃; and

wherein the particles are dispersed in organic medium.

2. The conductive paste of claim 1 comprising 0.1 to 8 wt % metal oxide.

3. The conductive paste of any one of claims 1 or 2, wherein said organic medium is 10-35 wt % of the paste composition.

4. The conductive paste of any one of claims 1-3, wherein said organic medium comprises methyl methacrylate and butylcarbitolacetate.

5. The use of the conductive paste of any one of claims 1-4 as a terminal electrode composition for multilayer capacitors.

6. A method of forming a terminal electrode comprising:

(a) forming the conductive paste of any one of claims 1-4;

(b) coating the composition of (a) onto a terminal electrode-forming site of a multilayer capacitor; and

(c) firing the multilayer capacitor in (b) to form a finished terminal electrode.

7. A multilayer capacitor utilizing the conductive paste of any one of claims 1-4.