Patent US4011054A successfully refreshed from Google Patents.
US4011054A
Expired / Lapsed
US
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Sinter material for sealing strips in rotary piston engines
Assignee: Goetze GmbH
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Filing: 1976-09-09
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Granted: 1977-03-08
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Expires: 1996-09-09
Abstract
Abstract A sinterable material for use as sealing strips for rotary piston engines, the material being based on a known mixture of iron and vanadium carbide and further including a material which will be liquid at the sintering temperature and which will wet the carbide grains and partially dissolve them to give them a rounded form in the finished strip.
Inventors
- 👤 Horst Beyer
- 👤 Ulrich Buran
- 👤 Norbert Dautzenberg
- 👤 Joseph Hewing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:35
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; C22C33/0207; F; F01; F01C; F01C19/00; F01C19/005; Y; Y10; Y10T; Y10T29/00; Y10T29/27; Y10T428/00; Y10T428/12; Y10T428/12014
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
160 words
In a sintered material for a sealing strip of a rotary piston engine and produced from a powder mixture of 15 to 45 weight percent of vanadium carbide or a mixture of vanadium carbide with at least one other metal carbide and balance essentially iron or iron alloy, the improvement wherein the powder mixture further comprises at least one additive selected from the group consisting of (1) the compound Cu 3 P, (2) an alloy of the system Fe--B, (3) an alloy of the system Cu-Mn, and (4) an alloy of the system Ni--Mn--B, the amount of said additives (1), (2) and (3) when present being 4 weight percent and the amount of said additive (4) when present being 3 to 5 weight percent, said additive being liquid at the material sintering temperature and being effective to wet and partially dissolve the vanadium carbide during the sintering process and prevent the vanadium carbide from breaking out of the sintered material.
Claim 2
Dependent Claim
160 words
In a sintered material for a sealing strip of a rotary piston engine and produced from a powder mixture of 15 to 45 weight percent of vanadium carbide or a mixture of vanadium carbide with at least one other metal carbide and balance essentially iron or iron alloy, the improvement wherein the powder mixture further comprises at least one additive selected from the group consisting of (1) the compound Cu 3 P, (2) an alloy of the system Fe--B, (3) an alloy of the system Cu-Mn, and (4) an alloy of the system Ni--Mn--B, the amount of said additives (1), (2) and (3) when present being 4 weight percent and the amount of said additive (4) when present being 3 to 5 weight percent, said additive being liquid at the material sintering temperature and being effective to wet and partially dissolve the vanadium carbide during the sintering process and prevent the vanadium carbide from breaking out of the sintered material.
Claim 3
Dependent Claim
30 words
Sintered material as defined in claim 1, wherein the vanadium carbide is present in a mixture with a carbide of at least one of tungsten, molybdenum, chromium, zirconium, and titanium.
Claim 4
Dependent Claim
18 words
Sintered material as defined in claim 1, wherein the powder mixture further includes chromium, molybdenum, vanadium and/or titanium.
Claim 5
Dependent Claim
20 words
Sintered material as defined in claim 1, wherein said additive is present in an amount of 4 percent by weight.
Claim 6
Dependent Claim
18 words
Sintered material as defined in claim 1, wherein said additive comprises 3 to 5 weight percent of Ni--Mn--B.
Claim 7
Dependent Claim
29 words
Sintered material as defined in claim 1, wherein said powder mixture comprises 22 weight percent vanadium carbide, 74 weight percent iron powder, and 4 weight percent of said additive.
Claim 8
Dependent Claim
28 words
Sintered material as defined in claim 1, wherein said powder mixture comprises 75 weight percent of iron powder, 22 weight percent vanadium carbide, and 3 weight percent Ni-Mn-B.
Claim 9
Dependent Claim
20 words
Sintered material as defined in claim 7, wherein said iron powder includes 2.4 percent chromium and 4.8 weight percent molybdenum.
Claim 10
Dependent Claim
42 words
Sintered material as defined in claim 1, wherein said powder mixture comprises 75 weight percent iron powder, 22 weight percent of a mixture containing 50 parts by weight vanadium carbide and 50 parts by weight tungsten carbide, and 3 weight percent Ni--Mn--B.
Claim 11
Dependent Claim
21 words
Sintered material as defined in claim 9, wherein said iron powder includes 2.4 weight percent chromium and 4.8 weight percent molybdenum.
Claim 12
Dependent Claim
27 words
Sintered material as defined in claim 1, wherein said powder mixture comprises 65 weight percent iron powder, 30 weight percent vanadium carbide, and 5 weight percent Ni--Mn--B.
Claim 13
Dependent Claim
21 words
Sintered material as defined in claim 11, wherein said iron powder includes 4 weight percent chromium and 4 weight percent tungsten.
Claim 14
Dependent Claim
27 words
Sintered material as defined in claim 1, wherein said powder mixture comprises 55 weight percent iron powder, 40 weight percent vanadium carbide and 5 weight percent Ni-Mn-B.
Claim 15
Dependent Claim
21 words
Sintered material as defined in claim 13, wherein said iron powder includes 4 weight percent chromium and 4 weight percent tungsten.
Claim 16
Dependent Claim
33 words
Sintered material as defined in claim 1, wherein said powder mixture comprises 55 to 75 weight percent iron powder, 11 to 40 weight percent vanadium carbide and 3 to 5 weight percent Ni--Mn--B.
References Cited (Backward Citations)
US2791025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |