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Powder metal composition and method for producing components thereof

A powder, cobalt-based technology, applied in the field of powder metallurgy, can solve the problems of no fracture toughness, poor machinability, uneven distribution of hard phases, etc.

Inactive Publication Date: 2006-05-24
HOGANAS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbide segregation leads to uneven distribution of hard phases
Disadvantages of these materials are lack of fracture toughness and poor machinability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The cobalt-based prealloy powders in the composition according to the invention can be produced by water atomizing a melt with the desired composition.

[0013] The cobalt-based prealloy powder according to the invention comprises less than 0.3% by weight of carbon. However, the carbon content of the powder is preferably less than 0.1% by weight, most preferably less than 0.05% by weight (ie substantially free of carbon other than unavoidable impurities).

[0014] The cobalt-based pre-alloyed powder comprises at least 15% by weight and preferably less than 35% by weight of Cr.

[0015] The addition of Cr increases the strength of the cobalt matrix through solid solution hardening and / or carbide formation. This effect is further enhanced by adding W and / or Mo.

[0016] Other elements that may be contained in the cobalt-based prealloy powder may be selected from Ni, Fe, Si, Mn, V and B.

[0017] A preferred pre-alloyed powder according to the invention comprises: 5-35%...

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PUM

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Abstract

The present invention relates to a powder metal composition for the manufacture of powder metal parts comprising a cobalt based prealloy powder having irregularly shaped particles mixed with graphite, the cobalt based prealloy powder comprising at least 15% by weight of Cr and Less than 0.3% by weight of C. The invention also relates to a method of manufacturing a PM part by compacting a powder metal composition according to the invention and sintering it.

Description

technical field [0001] The present invention relates to powder metallurgy. More specifically, the present invention relates to a cobalt-based powder metal composition and a method of making parts of the composition particularly suitable for use in heavy duty conditions. Background technique [0002] Cobalt-based alloys such as Stellite  (Co-Cr-W alloy trademark) is a cemented carbide that is highly resistant to many forms of wear. Products of these alloys exhibit high hardness over a wide temperature range, and they are resistant to corrosion. These products are especially used for casting various parts, such as machine parts (bearing bushes, valve seat rings, etc.) or other parts requiring high density, high strength and high wear resistance. [0003] Cast materials are often limited by microstructural defects and carbide segregation. Carbide segregation leads to uneven distribution of hard phases. Disadvantages of these materials are lack of fracture toughness and po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C1/04C22C19/07C22C32/00
CPCC22C1/0433C22C1/045C22C32/0084B22F1/00
Inventor O·马尔斯C·绍博
Owner HOGANAS AB