US3907546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molybdenum flame spray powder and process
Assignee: GTE Sylvania Inc
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Filing: 1974-08-21
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Granted: 1975-09-23
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Expires: 1994-08-21
Abstract
Abstract The bulk density of a flame spray powder of agglomerates of finely divided molybdenum or molybdenum alloy particles is increased by adding from 0.1 to 0.5 weight percent of finely divided nickel particles to the agglomerates and heating the agglomerates at a temperature of from 1050*C to 1300*C for from 1 to 7 hours, resulting in increased flame spray coating rates due to the increased weight of metal sprayed per unit of time.
Inventors
- 👤 David J Port
- 👤 Richard F Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/08; B; B22; B22F; B22F1/00; B22F1/14; B22F1/148; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A FREE FLOWING FLAME SPRAY POWDER COMPRISING AGGLOMERATES OF POWDER PARTICLES, SAID AGGLOMERATES CONSISTING ESSENTIALLY OF SUBPARTICLES OF MOLYBDENUM AND FROM 0 TO 50 WEIGHT PERCENT OF A SOLID SOLUTION ALLOYING ELEMENT SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN, RHENIUM, CHROMIUM AND THE GROUP VIII ELEMENTS, SAID SUBPARTICLES AT LEAST PARTLY COATED WITH LAYERS OF NICKEL, AT LEAST A PORTION OF THE SUBPARTICLES CONTAINING ZONES OF DIFFUSED NICKEL ATOMS ADJACENT TO AT LEAST A PORTION OF THE SURFACE AREAS OF CONTACTS OF THE SUBPARTICLES WITH THE NICKEL LAYERS, AND AT LEAST A PORTION OF THE NICKEL LAYERS CONTAINING DIFFUSED ATOMS FROM THE SUBPARTICLES, THE TOTAL AMOUNT OF NICKEL LAYERS IN THE AGGLOMERATES BEING FROM 0.1 TO 0.5 WEIGHT PERCENT OF THE AGGLOMERATES.
Claim 2
Dependent Claim
122 words
A FREE FLOWING FLAME SPRAY POWDER COMPRISING AGGLOMERATES OF POWDER PARTICLES, SAID AGGLOMERATES CONSISTING ESSENTIALLY OF SUBPARTICLES OF MOLYBDENUM AND FROM 0 TO 50 WEIGHT PERCENT OF A SOLID SOLUTION ALLOYING ELEMENT SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN, RHENIUM, CHROMIUM AND THE GROUP VIII ELEMENTS, SAID SUBPARTICLES AT LEAST PARTLY COATED WITH LAYERS OF NICKEL, AT LEAST A PORTION OF THE SUBPARTICLES CONTAINING ZONES OF DIFFUSED NICKEL ATOMS ADJACENT TO AT LEAST A PORTION OF THE SURFACE AREAS OF CONTACTS OF THE SUBPARTICLES WITH THE NICKEL LAYERS, AND AT LEAST A PORTION OF THE NICKEL LAYERS CONTAINING DIFFUSED ATOMS FROM THE SUBPARTICLES, THE TOTAL AMOUNT OF NICKEL LAYERS IN THE AGGLOMERATES BEING FROM 0.1 TO 0.5 WEIGHT PERCENT OF THE AGGLOMERATES.
Claim 3
Dependent Claim
21 words
The powder of claim 1 having agglomerate sizes below 170 mesh and bulk densities up to 3.6 grams per cubic centimeter.
Claim 4
Dependent Claim
20 words
The powder of claim 1 wherein the subparticles consist essentially of from 10 to 20 weight percent tungsten, remainder molybdenum.
Claim 5
Dependent Claim
119 words
Process for producing a free flowing flame spray powder comprising: a. agglomerating a mixture of finely divided particles to produce a free flowing powder of particle agglomerates, the mixture consisting essentially of molybdenum powder particles, powder particles of a solid solution alloying element for molybdenum selected from the group consisting of tungsten, rhenium, chromium and the group VIII elements in the amount of from 0 to 50 weight percent of the molybdenum powder, and nickel powder particles, the nickel powder being present in an amount of from 0.1 to 0.5 weight percent of molybdenum and alloying powder; and b. heat treating the powder agglomerates at a temperature below the melting point of nickel to increase the bulk density thereof.
Claim 6
Dependent Claim
119 words
Process for producing a free flowing flame spray powder comprising: a. agglomerating a mixture of finely divided particles to produce a free flowing powder of particle agglomerates, the mixture consisting essentially of molybdenum powder particles, powder particles of a solid solution alloying element for molybdenum selected from the group consisting of tungsten, rhenium, chromium and the group VIII elements in the amount of from 0 to 50 weight percent of the molybdenum powder, and nickel powder particles, the nickel powder being present in an amount of from 0.1 to 0.5 weight percent of molybdenum and alloying powder; and b. heat treating the powder agglomerates at a temperature below the melting point of nickel to increase the bulk density thereof.
Claim 7
Dependent Claim
27 words
Process of claim 3 in which the heat treatment is carried out within the temperature range of from 900*C to 1300*C for from 1/2 to 7 hours.
Claim 8
Dependent Claim
27 words
Process of claim 5 in which the heat treatment is carried out within the temperature range of from 1100*C to 1300*C for from 3 to 5 hours.
Claim 9
Dependent Claim
17 words
Process of claim 5 in which the agglomerate size of the powder mixture is below 170 mesh.
Claim 10
Dependent Claim
43 words
Process of claim 4 in which nickel is present in the powder mixture in the amount of from 0.1 to 0.2 weight percent and the powder agglomerates are heated at a temperature of from 1050*C to 1200*C for from 1/2 to 5 hours.
Claim 11
Dependent Claim
35 words
Process oF claim 4 in which the agglomerated powder is formed by spray drying a slurry of finely divided particles in a liquid, the liquid comprising a solution of a binder in a volatile solvent.
Claim 12
Dependent Claim
29 words
Process of claim 4 in which the particles of the alloying element consist essentially of tungsten and are present in the amount of from 10 to 20 weight percent.
References Cited (Backward Citations)
US3407057A
Cited
US3617358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |