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US 5,181,549 AGranted
Method for manufacturing porous articles
AssigneeDmk Tek, Inc.
InventorVladimir I. Shapovalov
Life of this patent
Estimating the term…
Abstract
A process for forming porous articles. The method utilizes an enclosed vessel in which a base material is melted into a molten state. A gas, whose solubility in the base material decreases with decreasing temperature of the base material and increases with increasing pressure of the gas, is dissolved into the base material. Means are provided for cooling the base material while maintaining the gas at a predetermined pressure thereby causing the gas to precipitate during cooling forming pores in the solidified base material.
Claims19
A process of forming a porous solid article comprising the steps of:
- providing a base material;
- heating said base material to cause said base material to melt to a liquid phase;
- exposing said liquid phase of said base material to a gas which dissolves into said base material, said gas having a solubility in said base material which decreases with decreasing temperature of said base material and which increases with increasing pressure of said gas;
- maintaining said gas at a predetermined pressure and allowing said gas to dissolve into said liquid phase of said base material;
- cooling said base material causing said base material to solidify;
- and
- controlling the pressure of said gas during said cooling step to cause said gas to precipitate within said solidifying base material thereby forming pores in said base material and thereby forming said porous solid article.
4 more elements
Dependencies are inferred from the claim text.