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US4970049A
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US
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Sintered materials
Assignee: Federal Mogul Coventry Ltd
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Filing: 1988-10-06
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Granted: 1990-11-13
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Expires: 2008-10-06
Abstract
Abstract Sintered ferrous materials are described having a composition in wt % lying within the ranges of C 0.8-1.5/W 1-4.4/Mo 1-4.4/V 1-2.6/Cr 1.3-3.2/Others 3 max./Fe balance. The material may be made by a method comprising the steps of mixing between 40 and 70 wt % of a powder having a composition in wt % within the ranges C 0.45-1.05/W 2.7-6. 2/Mo 2.8-6.2/V 2.8-3.2/Cr 3.8-4.5/Others 3.0 max./Fe balance with between 60 and 30 wt % of an iron powder and from 0.4 to 0.9 wt % of carbon powder, pressing a green body of the article from the mixed powder and then sintering the green body. The material may optionally contain sulphur, metallic sulphides. The material may be infiltrated.
Inventors
- 👤 Andrew R. Baker
- 👤 Richard L. Kettle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:30
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; C22C33/0207; C22C33/0242
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A method of making a sintered ferrous material, the method comprising the steps of mixing between 40 and 70 wt % of an alloyed powder having a composition in wt % within the ranges C 0.45-1.05/W 2.7-6.2/Mo 2.8-6.2/V 2.8-3.2/Cr 3.8-4.5/Others 3.0 max./Fe balance with between 60 and 30 wt % of an iron powder and from 0.4 to 0.9 wt % of carbon powder, pressing a green body of the article from the mixed powder and then sintering the green body.
Claim 2
Independent Claim
81 words
A method of making a sintered ferrous material, the method comprising the steps of mixing between 40 and 70 wt % of an alloyed powder having a composition in wt % within the ranges C 0.45-1.05/W 2.7-6.2/Mo 2.8-6.2/V 2.8-3.2/Cr 3.8-4.5/Others 3.0 max./Fe balance with between 60 and 30 wt % of an iron powder and from 0.4 to 0.9 wt % of carbon powder, pressing a green body of the article from the mixed powder and then sintering the green body.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein a minimum total of 0.8 wt % carbon is present.
Claim 4
Dependent Claim
20 words
A method according to claim 1 further including the step of mixing in up to 1 wt % of sulphur.
Claim 5
Dependent Claim
24 words
A method according to claim 1 further including the step of mixing in up to 5 wt % of one or more metallic sulphides.
Claim 6
Dependent Claim
22 words
A method according to claim 1 further including the step of mixing in from 4 to 6 wt % of copper powder.
Claim 7
Dependent Claim
18 words
A method according to claim 1 further including the step of infiltrating the material with a copper alloy.
Claim 8
Dependent Claim
16 words
A method according to claim 1 further including the step of cryogenically treating the sintered material.
Claim 9
Dependent Claim
28 words
A method as claimed in claim 1 wherein the composition and conditions are such that the sintered material comprises a martensitic matrix containing alloy carbides and bainite phases.
Claim 10
Dependent Claim
43 words
A method as claimed in claim 7 further comprising tempering the cryogenically treated sintered material at a temperature in the range of about 575° C. to 710° C. such that the alloy matrix comprises tempered martensite with spheroidized alloy carbides and bainite regions.
References Cited (Backward Citations)
GB1142683A
Cited
US4123265A
Cited
US4021205A
Cited
US4204031A
Cited
US4131450A
Cited
US4233073A
Cited
GB2093065A
Cited
GB2109004A
Cited
DE3232001A1
Cited
US4485147A
Cited
US4561889A
Cited
US4556533A
Cited
US4614544A
Cited
US4702771A
Cited
WO1987000207A1
Cited
US4755222A
Cited
GB2197663A
Cited
US4861372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |