Method for coating a dielectric ceramic piece

• US 5,281,326 A
• Filed: 04/30/1992
• Issued: 01/25/1994
• Est. Priority Date: 09/19/1990
• Status: Expired due to Fees

• Current Assignee: Filtronic LK Oy
• Original Assignee: LK Products Oy (Yageo Corporation)
• Inventors: Galla, Elli K.
• Primary Examiner(s): Niebling, John
• Assistant Examiner(s): Mayekar, Kishor
• Application Number:
  US07/855,629
• Time in Patent Office: 635 Days
• Field of Search: 205/162, 205/163, 205/183, 205/184
• US Class Current: 205/163
• CPC Class Codes: C04B 35/00 Shaped ceramic products characterised by their composition porous ceramic products C04B38/00; ceramic articles characterised by particular shape, see the relevant classes, e.g. linings for casting ladles, tundishes, cups or the like B22D41/02; ceramic substrates for microelectronic semi-conductors H01L23/15; Ceramics compositions containing free metal bonded to carbides, diamond, oxides, borides, nitrides, silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides or sulfides other than as macroscopic reinforcing agents C22C; shaping of ceramics B28B; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products chemical preparation of powders of inorganic compounds C01; infiltration of sintered ceramic preforms with molten metal C04B41/51
• CPC Class Codes: C04B 41/009 characterised by the material treated
• CPC Class Codes: C04B 41/5111 Ag, Au, Pd, Pt or Cu
• CPC Class Codes: C04B 41/5127 Cu, e.g. Cu-CuO eutectic
• CPC Class Codes: C04B 41/5161 Tin
• CPC Class Codes: C04B 41/5166 Lead
• CPC Class Codes: C04B 41/52 Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
• CPC Class Codes: C04B 41/89 for obtaining at least two superposed coatings having different compositions
• CPC Class Codes: H05K 1/0242 Structural details of individual signal conductors, e.g. related to the skin effect
• CPC Class Codes: H05K 1/092 Dispersed materials, e.g. conductive pastes or inks
• CPC Class Codes: H05K 3/246 Reinforcing conductive paste, ink or powder patterns by other methods, e.g. by plating

Abstract

A method for coating a dielectric ceramic piece by a layer of electrical conductivity whereby the method consists of coating the ceramic piece with an electrically conductive paste and of growing a metal layer of good electrical conductivity upon this layer.

Claims

1. A method of forming a ceramic component which has characteristics useful in a microwave band application, comprising the steps of:

coating a dielectric ceramic body with a layer of a paste having electrical conductivity, the paste being selected from the group consisting of a silver and copper paste; and

subsequently a growing electrolytically an electrically conductive metal layer upon the coated layer, the metal layer being selected from the group consisting of a silver layer, a copper and tin-lead layer, and a tin layer.

2. A method as in claim 1, wherein the silver paste coats the ceramic body, the silver paste having a thickness between about 5 to 10 micrometers.

3. A method as in claim 1, wherein the metal layer has a thickness between about 10 to 20 micrometers.

4. A method as in claim 1, further comprising the step of washing the dielectric ceramic body with an organic detergent and then drying the washed dielectric ceramic body before the step of coating.

5. A method as in claim 1, wherein the step of coating includes sintering and then cooling the paste.

6. A method as in claim 1, wherein the steps of coating and growing are performed so that the ceramic component has Q values which permit the ceramic component to serve as a ceramic resonator in the microwave band application.