Moldable composition for use in hand or machine forming an article
First Claim
Patent Images
1. An extruded composition for use in machine forming an article, said extruded composition comprising:
- (a) at least one fine, sinterable metal-based powder;
(b) a water dispersible binder; and
(c) the balance water, wherein the extrusion rate of said extruded composition through about a 1½
mm nozzle is between about 18,000 Pascal seconds and about 1,800,000 Pascal seconds at a pressure of 120 PSI.
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Abstract
A moldable composition for use in hand or machine forming an article. In one embodiment, the composition including at least 78 wt. % of one fine metal-based powder; a water dispersible binder; and between about 2 wt. % and about 20 wt. % water, wherein the extrusion rate of the composition through about a 1½ mm nozzle is between about 0.05 gm/min and about 5 gm/min at a pressure of 120 PSI. The composition may further include up to about 2 wt. % of molding additives to improve the stability of the composition during molding and to improve the physical properties of the composition after drying.
28 Citations
34 Claims
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1. An extruded composition for use in machine forming an article, said extruded composition comprising:
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(a) at least one fine, sinterable metal-based powder; (b) a water dispersible binder; and (c) the balance water, wherein the extrusion rate of said extruded composition through about a 1½
mm nozzle is between about 18,000 Pascal seconds and about 1,800,000 Pascal seconds at a pressure of 120 PSI. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An extruded composition for use in machine forming an article, said extruded composition comprising:
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(a) at least 78 wt. % of one fine metal-based powder; (b) between about 0.2 wt. % and less than about 1.5 wt. % of a water dispersible binder; and (c) between about 2 wt. % and about 20 wt. % water, wherein the extrusion rate of said extruded composition through about a 1½
mm nozzle is between about 18,000 Pascal seconds and about 1,800,000 Pascal seconds at a pressure of 120 PSI. - View Dependent Claims (17, 18)
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19. An extruded composition for use in machine forming an article, said extruded composition comprising:
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(a) at least 78 wt. % of one fine metal-based powder; (b) between about 0.2 wt. % and less than about 1.5 wt. % of a water dispersible binder; (c) up to about 2 wt. % of molding additives to improve the stability of said extruded composition by reducing the rate of oxidation of the metal-based powder during storage and forming and to improve the physical properties of the article after forming and drying by remaining hand carvable prior to sintering; and (d) between about 2 wt. % and about 20 wt. % water, wherein the extrusion rate of said extruded composition through about a 1½
mm nozzle is between about 18,000 Pascal seconds and about 1,800,000 Pascal seconds at a pressure of 120 PSI. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification