Diffusion bonded nickel-copper powder metallurgy powder
AssigneeInco Limited
InventorsTajpreet Singh, Scott Campbell, Thomas Stephenson, Ouan Yang
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Abstract
In contrast to current industrial practice where alloying powders are added to starting powder metallurgy compositions either as powder mixtures or fully prealloyed powders, the present invention posits a diffusion bonded nickel-copper precursor additive mixture for direct one step addition to the starting powder metallurgy master blend composition. Segregation and dusting are substantially reduced and the mechanical properties of the resultant compact are improved.
Claims49
A diffusion bonded nickel-copper precursor powder suitable for use in powder metallurgy steels and alloys.
A method for making a precursor powder additive mixture for powder metallurgy steels and alloys, the method comprising:
- a) providing nickel;
- b) providing copper;
- c) mixing the nickel and copper;
- d) diffusion bonding the nickel and copper into a mixture adapted for addition to the powder metallurgy steels and alloys.
A method for making powder metallurgy products, the method comprising:
- a) providing a diffusion bonded nickel-copper precursor mixture,
- b) providing a metallurgy master powder,
- c) adding the diffusion bonded nickel-copper precursor mixture to the iron-based steel metallurgy master powder to form a powder blend,
- d) mixing the powder blend,
- e) consolidating the powder blend, and
- f) sintering the powder blend to generate a powder metallurgy product of selected shape.
A method for making a precursor powder additive mixture for powder metallurgy steels and alloys, the method comprising:
- a) providing nickel,
- b) providing copper,
- c) diffusion bonding elements and alloys selected from at least one of the group consisting of molybdenum, chromium, manganese, molybdenum trioxide, ferromanganese, ferrochrome, ferromolybdenum and ferrophosphorous to either the nickel or copper to create a composition,
- d) mixing the composition;
- and
- e) diffusion bonding nickel or copper and the composition into a mixture adapted for addition to the powder metallurgy steels and alloys.
Dependencies are inferred from the claim text.