초록 ▼

A cup-shaped sintered metal ultra-high efficiency filter which is capable of achieving of at least 99.9999999% efficiency at a most penetrating particle size at the maximum rated flow is produced using a metal powder with particles of less than 20 micrometers in diameter in a mold having a cylindric

A cup-shaped sintered metal ultra-high efficiency filter which is capable of achieving of at least 99.9999999% efficiency at a most penetrating particle size at the maximum rated flow is produced using a metal powder with particles of less than 20 micrometers in diameter in a mold having a cylindrical cavity with an end closure at one end and a removable cap at its other end. A core rod is seated in the end closure and extends coaxially within the cavity with its upper end disposed at a predetermined distance from the open end of the mold. The mold is oriented vertically with the open other end disposed upwardly, and metal powder is introduced into the cavity while vibrating the mold to achieve substantially uniform packing of the metal powder to a level above the core rod. The cap is placed on the open end of the mold and pressure is applied to the metal powder in the cavity to cause the metal powder to cohere and form a cup-shaped powdered metal structure having a cylindrical peripheral wall and an end wall. This cup-shaped structure is removed from the mold and sintered to obtain a porous cup-shaped sintered metal filter.

대표청구항 ▼

[ Having thus described the invention, what is claimed is:] [1.] A method for making a cup-shaped sintered metal ultra-high efficiency filter, the steps comprising:(a) providing a mold having a cylindrical cavity with an end closure at one end, and a cap at its other end removable therefrom to provi

[ Having thus described the invention, what is claimed is:] [1.] A method for making a cup-shaped sintered metal ultra-high efficiency filter, the steps comprising:(a) providing a mold having a cylindrical cavity with an end closure at one end, and a cap at its other end removable therefrom to provide an open end, and a core rod movably seated in said end closure and extending coaxially within said cavity;(b) orienting said mold vertically with said open other end disposed upwardly;(c) positioning the upper end of said core rod at a predetermined distance from said open other end of said mold;(d) introducing metal powder having a particle size of less than 20 micrometers into said cavity through said open end of said mold radially evenly about said core rod near said open end of the mold while vibrating said mold to achieve substantially uniform packing of said metal powder in said cavity and to a level above said core rod;(e) placing said cap on said other end of said mold;(f) applying pressure to said mold and thereby to said metal powder in said cavity to cause said metal powder to cohere and form a cup-shaped powdered metal structure having a cylindrical peripheral wall and an end wall;(g) removing said cup-shaped powdered metal structure from said mold; and(h) sintering said cup-shaped powdered metal structure to obtain a porous cup-shaped sintered metal filter.