Method for preparing binder-treated metallurgical powders containing an organic lubricant
AssigneeHoeganaes Corporation
InventorsFrederick J. Semel, Sydney Luk
Life of this patent
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Abstract
Methods for preparing metallurgical powders containing an organic lubricant are provided. The powders are prepared by wetting a dry admixture of an iron-based powder, at least one alloying powder, and a first organic lubricant with an organic binding agent that is preferably dissolved or dispersed in a solvent. After removal of the solvent, the dried powder composition is admixed with a second organic lubricant.
Claims24
An improved method for preparing a metallurgical powder composition of the kind containing an organic lubricant comprising the steps of:
- (a) providing a dry admixture of (i) an ironbased powder, (ii) at least one alloying powder, and (iii) a first amount of an organic lubricant;
- (b) providing a liquid mixture of an organic binding agent dissolved or dispersed in a solvent;
- (c) wetting said dry admixture with said liquid mixture;
- (d) removing the solvent, thereby forming a dry powder composition;
- and
- (e) admixing a second amount of an organic lubricant selected from the group consisting of soaps and waxes with said dry powder composition to form said metallurgical powder composition;
- wherein said second amount of organic lubricant is up to about 25 percent by weight of the total of said first and second amounts of organic lubricant, and wherein the total of said first amount and said second amount of organic lubricant constitutes up to about 3 percent by weight of said metallurgical powder composition.
A method for increasing the apparent density of a metallurgical powder composition comprising (i) an iron-based powder, (ii) at least one alloying powder, (iii) a binder, and (iv) a first organic lubricant, the method comprising admixing with said metallurgical powder composition a second organic lubricant that is a soap, wherein said second lubricant is up to about 25 percent by weight of the total of said first and second organic lubricants, and wherein the total of said first and said second lubricants constitutes up to about 3 percent by weight of said powder composition.
A method for decreasing the apparent density of a metallurgical powder composition comprising (i) an iron-based powder, (ii) at least one alloying powder, (iii) a binder, and (iv) a first organic lubricant, the method comprising admixing with said powder composition a second organic lubricant that is a wax, wherein said second lubricant is up to about 25 percent by weight of the total of said first and second organic lubricants and wherein the total of said first and said second lubricants constitutes up to about 3 percent by weight of said powder composition.
Dependencies are inferred from the claim text.