US3854984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum deposition of multi-element coatings and films with a single source
Assignee: General Electric Co
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Filing: 1973-11-27
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Granted: 1974-12-17
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Expires: 1993-11-27
Abstract
Abstract Multi-element coatings and films having a composition substantially the same as that of a precast ingot of source material are prepared by continuously and rapidly sweeping a high intensity electron beam over the source surface so that only a small volume is heated at any one instant, completely evaporated and vacuum deposited on a desired substrate as a coating of great uniformity in volume and thickness.
Inventors
- 👤 H Schadler
- 👤 J Rairden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:53
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/16; C23C14/22; C23C14/24; C23C14/28; C23C14/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
THE METHOD OF VACUUM EVAPORATING AND DEPOSITING ON THE SURFACE OF A TURBINE ENGINE METAL PART A MULTI-ELEMENT PROTECTIVE COATING OF SUBSTANTIALLY THE COMPOSITION OF A SINGLE METALLIC ALLOY SOURCE, WHICH COMPRISES THE STEPS OF CUTTING A SECTION FROM AN INGOT OF SAID ALLOY AND PLACING THE INGOT SECTION IN A CHAMBER EVACUATED TO A PRESSURE OF 10***4 TORR, SWEEPING A FOCUSED ELECTRON BEAM OF POWER DENSITY FROM 10**4 TO 10**10 WATTS PER SQUARE INCH BACK AND FORTH ACROSS THE SURFACE OF THE INGOT SECTION AT 60 CYCLES PER SECOND ALONG A LINE ON THE INGOT SECTION SURFACE ONE-HALF INCH LONG, AND EXPOSING THE TURBINE ENGINE PART TO THE COMBINED EVAPORATED COMPONENTS.
Claim 2
Independent Claim
112 words
THE METHOD OF VACUUM EVAPORATING AND DEPOSITING ON THE SURFACE OF A TURBINE ENGINE METAL PART A MULTI-ELEMENT PROTECTIVE COATING OF SUBSTANTIALLY THE COMPOSITION OF A SINGLE METALLIC ALLOY SOURCE, WHICH COMPRISES THE STEPS OF CUTTING A SECTION FROM AN INGOT OF SAID ALLOY AND PLACING THE INGOT SECTION IN A CHAMBER EVACUATED TO A PRESSURE OF 10***4 TORR, SWEEPING A FOCUSED ELECTRON BEAM OF POWER DENSITY FROM 10**4 TO 10**10 WATTS PER SQUARE INCH BACK AND FORTH ACROSS THE SURFACE OF THE INGOT SECTION AT 60 CYCLES PER SECOND ALONG A LINE ON THE INGOT SECTION SURFACE ONE-HALF INCH LONG, AND EXPOSING THE TURBINE ENGINE PART TO THE COMBINED EVAPORATED COMPONENTS.
Claim 3
Dependent Claim
34 words
The method of claim 1 in which the alloy source has a nominal composition of 70Co-25Cr-4Al-1Y, and in which the electron beam is operated at an intensity of about 107 watts per square inch.
Claim 4
Independent Claim
177 words
The method of vacuum evaporating and depositing on the surface of a turbine engine part a multi-element protective coating of substantially the composition of a single metallic alloy source which comprises the steps of providing a bulk body of said alloy in a chamber evacuated to a pressure less than 10 3 torr, continuously heating and evaporating alloy from the bulk body by sweeping an electron beam across the surface of the body at a rate such that the residence interval of the beam at each successive point of impingement of the beam on the body surface is less than one-three hundredth of a second and causing at each said successive impingement point the melting of a superficial portion of the bulk body and the evaporation of part of the resulting melt under the electron beam followed by freezing of melt residue of that superficial portion as the beam moves to the next successive points of impingement with the bulk body surface, and exposing the turbine engine part to the combined evaporated components of the said alloy.
Claim 5
Independent Claim
177 words
The method of vacuum evaporating and depositing on the surface of a turbine engine part a multi-element protective coating of substantially the composition of a single metallic alloy source which comprises the steps of providing a bulk body of said alloy in a chamber evacuated to a pressure less than 10 3 torr, continuously heating and evaporating alloy from the bulk body by sweeping an electron beam across the surface of the body at a rate such that the residence interval of the beam at each successive point of impingement of the beam on the body surface is less than one-three hundredth of a second and causing at each said successive impingement point the melting of a superficial portion of the bulk body and the evaporation of part of the resulting melt under the electron beam followed by freezing of melt residue of that superficial portion as the beam moves to the next successive points of impingement with the bulk body surface, and exposing the turbine engine part to the combined evaporated components of the said alloy.
Claim 6
Dependent Claim
23 words
The method of claim 3 in which the power density of the electron beam is from 104 to 1010 watts per square inch.
Claim 7
Dependent Claim
32 words
The method of claim 3 in which the alloy of the bulk is of at least two elements selected from the group consisting of iron, cobalt, nickel, chromium, aluminum, yttrium and silicon.
Claim 8
Dependent Claim
24 words
The method of claim 3 in which the diameter of the electron beam at the bulk body surface is between 0.002 and 0.005 inch.
Claim 9
Dependent Claim
21 words
The method of claim 3 in which the electron beam is swept across the bulk body surface in a raster-like pattern.
Claim 10
Dependent Claim
23 words
The method of claim 3 in which the residence interval of the electron beam is from one-three hundredth second to one-twelve thousandth second.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |