POROUS CERAMIC AND METHOD FOR PREPARATION THEREOF, AND MICROSTRIP SUBSTRATE

Title:

POROUS CERAMIC AND METHOD FOR PREPARATION THEREOF, AND MICROSTRIP SUBSTRATE

Document Type and Number:

WIPO Patent Application WO/2002/062727

Kind Code:

A1

Abstract:

A method for preparing a porous ceramic which comprises mixing a metal powder as a precursor of a ceramic (1) and a sintering aid, and subjecting the resulting mixture to a heat treatment by microwave heating, thereby allowing the metal powder to undergo oxidation or nitrogenation from the surface thereof and allowing the metal to diffuse toward and outside of an oxide or nitride layer formed in the outer shell of the powder, to prepare a porous ceramic (1) having fine and uniform closed pores (1a). The porous ceramic (1) has fine closed pores (1a) dispersed uniformly in a high proportion and thus exhibits excellent characteristics when used, for example, in an electronic circuit substrate which needs good resistance to moisture, a low dielectric constant and a low dielectric loss as well as good mechanical strength.

Inventors:

MIYANAGA MICHIMASA (JP)
UCHIMURA NOBORU (JP)
KOMURA OSAMU (JP)

Application Number:

PCT/JP2002/000937

Publication Date:

August 15, 2002

Filing Date:

February 05, 2002

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)
MIYANAGA MICHIMASA (JP)
UCHIMURA NOBORU (JP)
KOMURA OSAMU (JP)

International Classes:

B24B37/04; C04B35/581; C04B35/591; C04B38/00; H01P3/08; H05K1/02; H05K1/03; (IPC1-7): C04B38/00

Foreign References:

JP2001172090A	2001-06-26
JPH08295576A	1996-11-12
JPH08228105A	1996-09-03
EP0758633A1	1997-02-19

Other References: