| 摘要 |
<p>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.</p> |
