US2008019858A1PendingUtilityA1
Iron-based powder
Individually held — no corporate assignee on recordPriority: Jul 21, 2006Filed: Jun 25, 2007Published: Jan 24, 2008
Est. expiryJul 21, 2026(expired)· nominal 20-yr term from priority
B22F 2998/10B22F 2999/00B22F 2009/0828C22C 38/42C22C 38/06C22C 33/0285B22F 3/1007C22C 38/20B22F 9/082
20
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Claims
Abstract
An atomised pre-alloyed iron-based powder which comprises by weight-% 10.5-30 Cr 3-15 Al 5-20 Cu max 0.1 C max 0.2 N max 3.0 Mn max 2.5 Si max 3.0 Mo balance essentially only iron and unavoidable impurities.
Claims
exact text as granted — not AI-modified1 . An atomised pre-alloyed iron-based powder which comprises by weight-%
10.5-30
Cr
3-15
Al
5-20
Cu
max 0.1
C
max 0.2
N
max 3.0
Mn
max 2.5
Si
max 3.0
Mo
balance essentially only iron and unavoidable impurities.
2 . A powder according to claim 1 wherein content of Al is within the range of 5-12 weight-%.
3 . A powder according to claim 1 wherein content of Cu is within the range of 7-17 weight-%.
4 . A powder according to claim 1 wherein content of Cr is within the range of 15-30 weight-%.
5 . A powder according to claim 4 wherein content of Cr is within the range of 20-30 weight-%.
6 . A powder according to claim 1 wherein the powder further comprises 8-20 weight-% Ni.
7 . A powder according to claim 1 wherein the powder is produced by water atomization.
8 . Process for producing an water atomised pre-alloyed iron-based powder which comprises by weight-%:
10.5-30
Cr
3-15
Al
5-20
Cu
max 0.1
C
max 0.2
N
max 3.0
Mn
max 2.5
Si
max 3.0
Mo
balance essentially only iron and unavoidable impurities,
said process comprises providing a melt of iron and the alloying elements water atomizing the melt whereby the powder forms from atomized droplets upon solidification.
9 . Process according to claim 8 wherein the iron-based powder further comprises 8-20 weight-% Ni.
10 . A method of producing a sintered component comprising:
a) providing a sintering material comprising a water atomised pre-alloyed iron-based powder comprising by weight-%:
10.5-30
Cr
3-15
Al
5-20
Cu
max 0.1
C
max 0.2
N
max 3.0
Mn
max 2.5
Si
max 3.0
Mo
balance essentially only iron and unavoidable impurities; and
b) forming a green body from the sintering material; and
c) sintering the green body in a reducing or neutral atmosphere, at an atmospheric pressure or below, and at a temperature above 1100° C.
11 . Method according to claim 10 wherein in a) the provided sintering material is a mixture between a lubricant and/or a binder with the water atomised pre-alloyed iron-based powder.
12 . Method according to claim 11 wherein in b) the green body is formed by cold compaction of the mixture, where preferably the compaction pressure is within the range of 100-1000 MPa and preferably the temperature is below 100° C.
13 . Method according to claim 11 wherein in b) the green body is formed by warm compaction of the mixture, where preferably the compaction pressure is within the range of 300-1000 MPa and preferably the temperature is within the range of 100-200° C.
14 . Method according to claim 10 wherein in a) the provided sintering material is only the water atomised pre-alloyed iron-based powder.
15 . Method according to claim 11 wherein the green body is shaped without compacting the green body.
16 . Sintered component produced from the method of claim 10 wherein the sintered density of the component is above 6.5 g/cm 3 .
17 . Sintered component produced from the method of claim 10 wherein the tensile strength of the component is above 500 MPa.
18 . Sintered component produced from the method of claim 10 wherein the yield strength of the component is above 400 MPa.Join the waitlist — get patent alerts
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