Patent US1938247A successfully refreshed from Google Patents.
US4299860A
Expired / Lapsed
US
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Surface hardening by particle injection into laser melted surface
Assignee: United States Department of the Navy
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Filing: 1980-09-08
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Granted: 1981-11-10
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Expires: 2000-09-08
Abstract
Abstract A method of impregnating the surface of a metal substrate with wear resist particles to impart wear resisting characteristics to the surface. The substrate surface is subjected to a relatively moving high-powered laser beam to cause localized surface melting in passes thereacross, and hard wear resistant particles are forcibly velocity injected into the melt. The particles are captured upon solidification of the melt pool and retained therein by metallurgical bond. A wear resistant layer is formed which is an integral part of the underlying material.
Inventors
- 👤 Robert J. Schaefer
- 👤 Jack D. Ayers
- 👤 Thomas R. Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:25
CPC Classifications
C; C23; C23C; C23C26/00; C23C26/02; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; B23K35/327; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/903; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
57 words
A method of providing a wear resistant-coating on a metal substrate comprising: liquifying a surface portion of the metal substrate by a relatively moving laser beam; forcibly injecting wear resistant particles into the liquid metal substantially out of the influence of the laser beam; allowing the liquid metal to solidify thereby trapping the wear-resistant particles embedded therein.
Claim 2
Independent Claim
57 words
A method of providing a wear resistant-coating on a metal substrate comprising: liquifying a surface portion of the metal substrate by a relatively moving laser beam; forcibly injecting wear resistant particles into the liquid metal substantially out of the influence of the laser beam; allowing the liquid metal to solidify thereby trapping the wear-resistant particles embedded therein.
Claim 3
Dependent Claim
14 words
The method according to claim 1 wherein the laser beam moves across the substrate.
Claim 4
Dependent Claim
19 words
The method according to claim 2 wherein the laser beam moves at a speed of 1-20 centimeters per second.
Claim 5
Dependent Claim
17 words
The method according to claim 1 wherein the substrate is moved relative to a fixed laser beam.
Claim 6
Dependent Claim
18 words
The method according to claim 4 wherein the substrate moves at a speed of 1-20 centimeters per second.
Claim 7
Dependent Claim
24 words
The method according to claim 1 wherein the wear resistant particles are forcibly injected into the liquid metal by a propelling pressurized inert gas.
Claim 8
Dependent Claim
13 words
The method according to claim 6 wherein the propelling pressurized gas is helium.
Claim 9
Dependent Claim
29 words
The method according to claim 1 or 6 wherein the wear-resistant particles are forcibly injected into the liquid metal at a speed of 1 to 20 meters per second.
Claim 10
Dependent Claim
20 words
The method according to claim 1, wherein the wear resistant particles are of sizes ranging from 30 to 100 um.
Claim 11
Dependent Claim
21 words
The method according to claim 9 wherein the particle sizes being injected at any one time comprise a mix of sizes.
Claim 12
Independent Claim
44 words
The method according to claims 1, 2, 4, 6 or 7 wherein the laser beam power is 1-15 kW which establishes a liquid melt pool approximately 1/2 mm deep by 21/2 mm wide progressively across the substrate at 1 to 20 centimeters per second.
Claim 13
Independent Claim
105 words
A method of providing a wear resistant coating on a metal substrate comprising: moving a laser beam relative to the substrate surface at a selected speed and power density level sufficient to cause localized pool melting in a pass of predetermined width and depth; forcibly propelling hard wear resisting particles toward the surface of the melt substantially out of the influence of the laser beam, by flow of pressurized inert gas with sufficient kinetic energy to cause the particles to penetrate the melt surface and become embedded throughout the melt before solidification; allowing the melt to solidify thereby trapping the particles therein by metallurgical bond.
Claim 14
Independent Claim
105 words
A method of providing a wear resistant coating on a metal substrate comprising: moving a laser beam relative to the substrate surface at a selected speed and power density level sufficient to cause localized pool melting in a pass of predetermined width and depth; forcibly propelling hard wear resisting particles toward the surface of the melt substantially out of the influence of the laser beam, by flow of pressurized inert gas with sufficient kinetic energy to cause the particles to penetrate the melt surface and become embedded throughout the melt before solidification; allowing the melt to solidify thereby trapping the particles therein by metallurgical bond.
Claim 15
Dependent Claim
13 words
The method according to claim 12 wherein the propelling pressurized gas is helium.
Claim 16
Dependent Claim
18 words
The method according to claim 12 wherein resistant particles are of sizes ranging from 30 to 100 um.
Claim 17
Dependent Claim
16 words
The method according to claim 14 wherein the particles sizes injected comprise a mix of sizes.
Claim 18
Dependent Claim
26 words
The method according to claim 12, 14 or 15 wherein the hard wear-resistant particles comprise 5 to 70% by volume fraction of the wear resistant coating.
Claim 19
Dependent Claim
24 words
The method according to claim 12 wherein the wear resistant particles are propelled toward the surface of the melt just behind the laser beam.
Claim 20
Dependent Claim
29 words
The method according to claim 12 or 17 wherein the wear-resistant particles are propelled in a direction disposed at an angle to the general direction of the laser beam.
References Cited (Backward Citations)
US1654509A
Cited
US3148086A
Cited
US4051275A
Cited
UST967009I4
Cited
US4157923A
Cited
US4200669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |