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US 2006/0037433 A1Published application
Stabilized iron-based powdered metal molding compositions
OwnerRobert Morrisinventor
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Abstract
Molding compositions and forming processes for normally rust-prone iron-based powders, and articles produced therefrom. Metal alloy systems that can be successfully formed using the processes of the invention, include elemental iron and iron alloys including low and medium alloy steels, tool steels and a number of specialty iron-base alloys.
Claims11
A corrosion resistant molding composition comprising:
- a) at least one metal powder selected from the group consisting of the rusting alloys of iron;
- b) a gel forming polysaccharide binder;
- and
- c) a solution comprising:
- (i) at least one borate selected from the group consisting of boric acid (H3BO3), and a borate salt of sodium or potassium, said borate being present at an equivalent H3BO3 molar concentration in the range of from 0.035 to 0.3 moles/liter;
- (ii) at least one alkali metal hydroxide selected from the group consisting of sodium hydroxide (NaOH), and potassium hydroxide (KOH), wherein the equivalent H3BO3 to alkali metal hydroxide molar ratio in the solution is in the range of from 0.5 to 2.0;
- (iii) a solvent for said gel forming binder, said borate salt and said alkali metal hydroxide, wherein the solvent concentration in said molding composition is from 5 to 20 wt. %.
4 more elements
Dependencies are inferred from the claim text.