Sintered metal/polymer impregnated seat and method of fabricating the same

Abstract From the Canadian patent

A sintered metal body having an annular form suitable, for use as a valve seat or seal is impregnated with an, uncured polymeric material such as PTFE which is then cured to partially fill the interparticulate spaces in the sintered metal body. The impregnated body is then subjected to applied pressure which preserves the annular shape of the body while collapsing substantially all voids throughout the body to cause the cured polymeric material within the sintered metal body to completely fill the collapsed interparticulate spaces thereby to render the body nonporous throughout. Inasmuch as the interparticulate spaces are completely filled with cured polymeric material, any increases in …