US3929181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing alloys having wear-resistant surfaces
Assignee: Goetzewerke Friedrich Goetze AG
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Filing: 1973-07-05
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Granted: 1975-12-30
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Expires: 1993-07-05
Abstract
Abstract Alloys having wear-resistant surfaces are produced by incorporating in the molten matrix metal wear-resistance imparting components with a specific gravity lower or higher than the specific gravity of the matrix metal and centrifugally casting the resulting alloy in the form of a hollow cylinder whereby the component, if lighter, is concentrated in the inner surface portion of the cylinder wall, or, if heavier, the component is concentrated in the outer surface portion of the cylinder wall. Work pieces, such as sealing strips for rotary piston engines, may be formed from selected portions of these cylinders.
Inventors
- 👤 Horst Beyer
- 👤 Hans-Jurgen Veutgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
B; B22; B22D; B22D13/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
Process for producing materials with wear-resistant surfaces, comprising forming a melt of a matrix material and at least one substance which forms at least one hard solid phase having a density other than that of the matrix material and which separates from the basic matrix material during hardening, casting the resulting melt and subjecting the molten casting to mass acceleration during the hardening process.
Claim 2
Dependent Claim
64 words
Process for producing materials with wear-resistant surfaces, comprising forming a melt of a matrix material and at least one substance which forms at least one hard solid phase having a density other than that of the matrix material and which separates from the basic matrix material during hardening, casting the resulting melt and subjecting the molten casting to mass acceleration during the hardening process.
Claim 3
Dependent Claim
15 words
Process as defined in claim 1 wherein the melt is centrifugally cast into a pipe.
Claim 4
Dependent Claim
32 words
Process as defined in claim 1 wherein iron is used as the matrix material, said iron containing enough carbon that graphite must occur during hardening in addition to the hard solid phase.
Claim 5
Dependent Claim
19 words
Process as defined in claim 2 wherein machine parts with wear-resistant surfaces can be worked out of said pipe.
Claim 6
Dependent Claim
26 words
Process as defined iN claim 1 wherein the added substance is one which combines with carbon, nitrogen, or boron to form the wear-resistant hard solid phase.
Claim 7
Dependent Claim
25 words
Process as defined in claim 5 wherein the added substance is a metal selected from the group consisting of titanium, vanadium, niobium, tantalum, and tungsten.
Claim 8
Dependent Claim
23 words
Process as defined in claim 1 wherein the added substance is added in an amount of 0.3 to 5.0% of the final alloy.
Claim 9
Dependent Claim
28 words
Process as defined in claim 3 wherein the added substance is a metal selected from the group consisting of titanium, vanadium, niobium, tantalum, tungsten, copper, nickel and tin.
Claim 10
Dependent Claim
17 words
Process as defined in claim 4 wherein the machine parts are sealing strips for rotary piston engines.
Claim 11
Dependent Claim
21 words
Process as defined in claim 1 wherein the wear-resistant surface if formed on the inside surface of the cast matrix material.
Claim 12
Dependent Claim
21 words
Process as defined in claim 1 wherein the wear-resistant surface is formed on the outside surface of the cast matrix material.
Claim 13
Dependent Claim
28 words
Process as defined in claim 1 wherein the added substance it titanium, and is present at the inner surface in an amount higher than at the outer surface.
Claim 14
Dependent Claim
40 words
Process as defined in claim 12 wherein the titanium content through the cross section of the cast matrix material averages 1%, the titanium content at the outer surface is 0.34%, and the titanium content at the inner surface is 4.11%.
Claim 15
Dependent Claim
17 words
Process as defined in claim 13 wherein graphite appears at the inner surface to provide anti-friction properties.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |