Terminal electrode compositions for multilayer ceramic capacitors

• US 7,083,744 B2
• Filed: 09/25/2003
• Issued: 08/01/2006
• Est. Priority Date: 01/24/2003
• Status: Expired due to Fees

• 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
• Primary Examiner(s): KOPEC, MARK T
• Application Number:
  US10/670,669
• Publication Number:
  US 20040144205A1
• Time in Patent Office: 1,041 Days
• Field of Search: 252/512, 252/513, 427/96, 338/22.R
• US Class Current: 252/512
• 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 an 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 % SnO₂ metal oxide particles; 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. A terminal electrode for multilayer capacitors comprising the paste composition of claim 2.

4. The conductive paste of any one of claims 1 or 2, wherein said organic medium is 10–

35 wt % of the paste composition.

5. The conductive paste of claim 4, wherein said organic medium comprises methyl methacrylate and butylcarbitolacetate.

6. The conductive paste of claim 1, wherein said organic medium comprises methyl methacrylate and butylcarbitolacetae.

7. A method of forming a terminal electrode comprising:

(a) forming the conductive paste of claim 6;

(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.

8. A multilayer capacitor utilizing the conductive paste of claim 6.

9. A terminal electrode for multilayer capacitors comprising the paste composition of claim 1.