Back to results
US 5,368,630 AGranted
Metal powder compositions containing binding agents for elevated temperature compaction
AssigneeHoeganaes Corporation
InventorSydney Luk
Life of this patent
Estimating the term…
Abstract
An improved metallurgical powder composition capable of being compacted at elevated temperatures is provided comprising an iron-based powder, an alloying powder, a high temperature compaction lubricant, and a binder. The selected binders of this invention permit the bonded powder composition to achieve increased compressibility in comparison to unbonded powder compositions while reducing dusting and segregation of the alloying powder.
Claims30
An improved metallurgical powder composition comprising:
- (a) an iron-based metal powder;
- (b) a minor amount of at least one alloying powder;
- (c) an amount up to about 15% by weight of a high temperature compaction lubricant, said amount sufficient to allow compaction of the powder composition at elevated temperatures in a die, said lubricant comprising a polyamide lubricant that is the reaction product of about 10-30 weight percent of a C.sub.6 -C.sub.12 linear dicarboxylic acid, about 10-30 weight percent of a C.sub.10 -C.sub.22 monocarboxylic acid, and about 40-80 weight percent of a diamine having the formula (CH.sub.2).sub.x (NH.sub.2).sub.2 where x is 2-6;
- and
- (d) a minor amount of an organic binder for the iron-based and alloying powders, the binder comprising a resin selected from the group consisting of:
- (1) cellulose ester resins;
- (2) hydroxy alkylcellulose resins wherein the alkyl moiety has from 1-4 carbon atoms;
- and
- (3) thermoplastic phenolic resins.
6 more elements
An improved metallurgical powder composition comprising:
- (a) an iron-based metal powder having a weight average particle size of from 10-350 microns;
- (b) from about 0.25-5% by weight of an alloying powder having a weight average particle size below about 75 microns;
- (c) from about 0.1-2% by weight of a polyamide lubricant that is the reaction product of about 10-30 weight percent of a C.sub.6 -C.sub.12 linear dicarboxylic acid, about 10-30 weight percent of a C.sub.10 -C.sub.22 monocarboxylic acid, and about 40-80 weight percent of a diamine having the formula (CH.sub.2).sub.x (NH.sub.2).sub.2 where x is 2-6;
- and
- (d) from about 0.005-3% by weight of an organic binder for the iron-based and alloying powders, the binder comprising a resin selected from the group consisting of:
- (1) cellulose ester resins;
- (2) hydroxy alkylcellulose resins wherein the alkyl moiety has from 1-4 carbon atoms;
- and
- (3) thermoplastic phenolic resins.
6 more elements
An improved metallurgical powder composition consisting of:
- (a) an iron-based metal powder having a weight average particle size of from about 10-350 microns;
- (b) from about 0.25-5% by weight of an alloying powder having a weight average particle size below about 30 microns;
- (c) from about 0.1-2% by weight of a polyamide lubricant that is the reaction product of about 10-30 weight percent of a C.sub.6 -C.sub.12 linear dicarboxylic acid, about 10-30 weight percent of a C.sub.10 -C.sub.22 monocarboxylic acid, and about 40-80 weight percent of a diamine having the formula (CH.sub.2).sub.x (NH.sub.2).sub.2 where x is 2-6;
- and
- (d) from about 0.005-3% by weight of an organic binder for the iron-based and alloying powders, the binder comprising a resin selected from the group consisting of:
- (1) cellulose ester resins;
- (2) hydroxy alkylcellulose resins wherein the alkyl moiety has from 1-4 carbon atoms;
- and
- (3) thermoplastic phenolic resins.
6 more elements
Dependencies are inferred from the claim text.