Porosity takes a US patent

Hitachi Metals have developed a porous sintered metal and a filter made from it, and a method for producing porous sintered metal, that have been awarded a US Patent.

The invention relates to a "porous sintered metal comprising voids at least partially communicating with each other, and pores provided in walls of the voids with the average diameter of the pores being 1 micrometer or more when measured by a mercury press-in method."
An abstract of the invention, released by the US Patent Office, said: "The porous sintered metal is produced by blending a metal powder, a binder and resin particles to prepare a mixture in which the resin particles are dispersed; moulding the mixture to provide a green body; selectively extracting the resin particles from the green body with a solvent; debinding the extracted green body by heating; and sintering the debound green body."

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