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US 4,828,930 AGranted
Seamless porous metal article and method of making
AssigneePall Corporation
InventorPaul C. Koehler
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AssigneePall Corporation
InventorPaul C. Koehler
Estimating the term…
A method for making seamless, porous metal articles comprising: (a) rotating a mold containing a stabilized suspension of a metal particulate at a rate and for a time such that the particulate is separated from the suspension and distributed on the interior wall of the mold, thereby forming a structure conforming to the interior wall of the mold, the rate of rotation being sufficiently high that, preferably, at least about 65 Gs up to 100 Gs of centrifugal acceleration is achieved at the interior wall of the structure, (b) drying the formed structure to provide a structure having green or unsintered strength, and (c) sintering the dried structure to remove volatile material and fuse the individual particles of the particulate to each other to form the seamless, porous metal article. Metal articles in accordance with the invention have substantially uniform diameters, thicknesses and pore structurs, have Bubble Point ratios of greater than 1.5 up to 2.5, and find particular use as filters. 0044
A method of manufacturing a seamless, hollow, porous article comprising:
A method for manufacturing a seamless, hollow, porous metal article having a graded pore structure comprising:
The method of claim 15 wherein the weight ratio of said metal particulate in said stabilized suspension to the other components therein is from about 8:1 to about 1:1.
A seamless, hollow porous metal article of substantially uniform diameter, wall thickness and pore structure comprising metal particulate in which the individual particles of said particulate are bonded to each other and said article has a Bubble Point ratio of greater than 1.5 up to about 2.5.
Dependencies are inferred from the claim text.