Patent US3676638A successfully refreshed from Google Patents.
US3676638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma spray device and method
Assignee: Sealectro Corp
•
Filing: 1971-01-25
•
Granted: 1972-07-11
•
Expires: 1991-01-25
Abstract
Abstract An improved plasma spray device which deposits heat fusible material onto a substrate to form a continuous film. The plasma is effected by passing an ionizable gas between two electrodes which support an electric arc. The material to be deposited on the substrate is added to the plasma during its passage through a large nozzle. The gas is directed into a helical path by a plurality of conduits formed in a large disk. The material rides on the cylindrical surface of the revolving gas before being ejected from either a nozzle with a constant interior diameter or a gradually changing diameter.
Inventors
- 👤 Mille Stand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:26
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/42; B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/226; C; C23; C23C; C23C4/00; C23C4/12; C23C4/134; H05H1/34; H05H1/3478; H05H1/3484; H05H1/38
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
188 words
A plasma spray device for depositing powdered heat fusible material carried by a plasma onto a substrate comprising, means to produce a rotating plasma, a nozzle having a conduit for the passage of the powdered heat fusible material mixed with a plasma, an opening leading into said nozzle conduit for supplying powdered material to the hot plasma, said opening disposed at an angle to the nozzle conduit for tangently directing the powder into a rotating plasma and mixing with the surface layer thereof, said nozzle formed with a flared conical surface at its interior end which forms a first electrode for an electric arc, an axial cylinder secured adjacent to said conical surface for forming a second electrode, said first and second electrodes defining an arc space, a gas distribution disk mounted around a supporting structure which disk holds the axial cylinder in place, an annular space in said gas disk connected to a source of gas supply, and a plurality of angular eject conduits in said disk so constructed that the gases issuing therefrom wilL rotate as they pass through the arc space and through the nozzle.
Claim 2
Dependent Claim
188 words
A plasma spray device for depositing powdered heat fusible material carried by a plasma onto a substrate comprising, means to produce a rotating plasma, a nozzle having a conduit for the passage of the powdered heat fusible material mixed with a plasma, an opening leading into said nozzle conduit for supplying powdered material to the hot plasma, said opening disposed at an angle to the nozzle conduit for tangently directing the powder into a rotating plasma and mixing with the surface layer thereof, said nozzle formed with a flared conical surface at its interior end which forms a first electrode for an electric arc, an axial cylinder secured adjacent to said conical surface for forming a second electrode, said first and second electrodes defining an arc space, a gas distribution disk mounted around a supporting structure which disk holds the axial cylinder in place, an annular space in said gas disk connected to a source of gas supply, and a plurality of angular eject conduits in said disk so constructed that the gases issuing therefrom wilL rotate as they pass through the arc space and through the nozzle.
Claim 3
Dependent Claim
32 words
A spray device as claimed in claim 1 wherein said openings which supply powdered material and said eject conduits are disposed at approximately the same angular relationship to the nozzle conduit axis.
Claim 4
Dependent Claim
33 words
A spray device as claimed in claim 1 wherein said disk is secured to the nozzle and to said axial cylinder whereby an electric potential is established therebetween for supporting an electric arc.
Claim 5
Dependent Claim
34 words
A spray device as claimed in claim 1 wherein a series of openings are provided for supplying powdered material to the nozzle, said openings being mounted opposite to each other in the nozzle cylinder.
Claim 6
Dependent Claim
33 words
A spray device as claimed in claim 1 wherein said axial cylinder is formed with a conical end, the angle of said cone being greater than the angle of said flared conical surface.
Claim 7
Dependent Claim
33 words
A spray device as claimed in claim 5 wherein the difference between the angle of said cone and the angle of said flared conical surface is between the range 10* - 30* .
Claim 8
Dependent Claim
109 words
A plasma spray device to produce a rotating plasma for depositing powdered heat fusible material carried by the plasma onto a substrate comprising a nozzle, two electrodes spaced apart and defining an arc space therebetween, a disk associated with said electrodes, a source of gas supply leading to said disk, said disk formed with a plurality of first angular eject conduits so constructed that the gas issuing therefrom rotates through the arc space and the nozzle, and a plurality of second conduits in the nozzle for supplying powdered material into the rotating plasma, said first and second conduits disposed at the same angular relationship to the nozzle conduit axis.
Claim 9
Dependent Claim
109 words
A plasma spray device to produce a rotating plasma for depositing powdered heat fusible material carried by the plasma onto a substrate comprising a nozzle, two electrodes spaced apart and defining an arc space therebetween, a disk associated with said electrodes, a source of gas supply leading to said disk, said disk formed with a plurality of first angular eject conduits so constructed that the gas issuing therefrom rotates through the arc space and the nozzle, and a plurality of second conduits in the nozzle for supplying powdered material into the rotating plasma, said first and second conduits disposed at the same angular relationship to the nozzle conduit axis.
Claim 10
Dependent Claim
45 words
A spray device as set forth in claim 7 wherein the angular eject conduits are spaced substantially in a circle around the entire area of said disk, and said angular eject conduits are set at such angles that the gas passing therethrough will immediately rotate.
Claim 11
Dependent Claim
28 words
A spray device as set forth in claim 7 wherein the angle of said electrodes defining the arc space has a difference of approximately 10* - 30* .
Claim 12
Dependent Claim
23 words
A spray device as set forth in claim 7 wherein said disk is an insulator and electrically separates the electrodes from each other.
Claim 13
Dependent Claim
18 words
A spray device as set forth in claim 7 wherein said disk is metal and is electrically conductive.
Claim 14
Dependent Claim
32 words
A spray device as set forth in claim 7 wherein said disk is made of conductive metal and the external jacket is an insulator and electrically separates the electrodes from each other.
Claim 15
Dependent Claim
36 words
A spray device as set forth in claim 5 wherein said cone is connected to the positive terminal of a source of direct current power and said flared conical surface is connected to the negative terminal.
Claim 16
Dependent Claim
56 words
A spray device as set forth in claim 1 wherein said plurality of angular conduits in the gas distribution disk direct the gas toward the nozzle axis and at the same time direct the flow at an angle to the axis to provide a cylindrical gas mass which rotates as it passes outwardly through the nozzle.
Claim 17
Dependent Claim
44 words
A spray device as set forth in claim 1 wherein the nozzle includes a conduit space defined by a smooth curving bore leading from the arc space to a point adjacent to the nozzle exit port to permit laminar flow of the hot gasses.
Claim 18
Dependent Claim
28 words
A spray device as set forth by claim 14 wherein the arc space is connected to the nozzle bore by a smooth curved surface to avoid turbulent flow.
Claim 19
Dependent Claim
56 words
A spray device as set forth by claim 16 wherein the side of the cone shaped cavity is at an angle approximately 45* to the longitudinal axis of the extension nozzle cylinder, and the conduits for supplying powdered material into the rotating plasma are at an angle of approximately 16 1/2 * to said nozzle cylinder.
Claim 20
Dependent Claim
43 words
A spray device as set forth by claim 14 wherein the arc space is adjoining an upstream cavity having a diameter of substantially 0.712 inches, a downstream constriction of substAntially 0.312 inches, and said nozzle having an exit diameter of substantially 0.538 inches.
References Cited (Backward Citations)
US2973426A
Cited
US2960594A
Cited
US3061710A
Cited
US3145287A
Cited
US3167633A
Cited
US3114826A
Cited
US3179784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |