Patent US3896244A successfully refreshed from Google Patents.
US3896244A
Expired / Lapsed
US
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Method of producing plasma sprayed titanium carbide tool steel coatings
Assignee: Alloy Technology International Inc
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Filing: 1973-06-08
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Granted: 1975-07-22
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Expires: 1993-06-08
Abstract
Abstract A method is disclosed for quench-depositing by plasma spraying onto the substrate an adherent thin coating of a titanium carbide tool steel containing by weight about 10% to 80% of primary grains of TiC and the balance essentially about 90% to 20% of a steel matrix, such that the resulting coating is one characterized metallographically by the presence of martensite. The metal substrate may be aluminum. Preferably, the titanium carbide grains should be rounded to assure a low friction surface.
Inventors
- 👤 John L Ellis
- 👤 M Kumar Mal
- 👤 Stuart E Tarkan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:27
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/226; C; C23; C23C; C23C4/00; C23C4/04; C23C4/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
162 words
A METHOD OF PRODUCING A HARD, WEAR RESISTANT COATING OF A HEAT TREATABLE TITANIUM CARBIDE TOOL STEEL ONTO A METAL SUBSTRATE WHICH COMPRISES, SELECTING A POWDER COMPOSITION CONTAINING ABOUT 10 TO 80% BY WEIGHT OF PRIMARY GRAINS OF TITANIUM CARBIDE AND THE BALANCE ESSENTIALLY ABOUT 90 TO 20% BY WEIGHT OF STEELFORMING INGREDIENTS WHICH, WHEN MELTED TO FORM A STEEL AND QUENCHED FROM AN AUSTENITIZING TEMPERATURE, TENDS TO FORM MARTENSITE, AND THEN SPRAYING SAID POWDER COMPOSITION WITH A PLASMA FLAME DIRECTLY ONTO SAID METAL SUBSTRATE TO QUENCHDEPOSIT A THIN COATING OF SAID COMPOSITION THEREON OF THICKNESS RANGING UP TO ABOUT 0.025 INCH, THEREBY PRODUCING AN ADHERENT THIN COATING OF SAID TITANIUM CARBIDE TOOL STEEL COMPOSITION ON SAID METAL SUBSTRATE CHARACTERIZED BY PRIMARY GRAINS OF TITANIUM CARBIDE UNIFORMLY DISPERSED THROUGH A MATRIX CONTAINING AN AUSTENITIC DECOMPOSITION PRODUCT CONTAINING MARTENSITE, AND FURTHER CHARACTERIZED IN THAT SAID COATING IS CAPABLE OF BEING HEAT TREATED AT A TEMPERATURE BELOW THE MELTING POINT OF THE METAL SUBSTRATE.
Claim 2
Independent Claim
162 words
A METHOD OF PRODUCING A HARD, WEAR RESISTANT COATING OF A HEAT TREATABLE TITANIUM CARBIDE TOOL STEEL ONTO A METAL SUBSTRATE WHICH COMPRISES, SELECTING A POWDER COMPOSITION CONTAINING ABOUT 10 TO 80% BY WEIGHT OF PRIMARY GRAINS OF TITANIUM CARBIDE AND THE BALANCE ESSENTIALLY ABOUT 90 TO 20% BY WEIGHT OF STEELFORMING INGREDIENTS WHICH, WHEN MELTED TO FORM A STEEL AND QUENCHED FROM AN AUSTENITIZING TEMPERATURE, TENDS TO FORM MARTENSITE, AND THEN SPRAYING SAID POWDER COMPOSITION WITH A PLASMA FLAME DIRECTLY ONTO SAID METAL SUBSTRATE TO QUENCHDEPOSIT A THIN COATING OF SAID COMPOSITION THEREON OF THICKNESS RANGING UP TO ABOUT 0.025 INCH, THEREBY PRODUCING AN ADHERENT THIN COATING OF SAID TITANIUM CARBIDE TOOL STEEL COMPOSITION ON SAID METAL SUBSTRATE CHARACTERIZED BY PRIMARY GRAINS OF TITANIUM CARBIDE UNIFORMLY DISPERSED THROUGH A MATRIX CONTAINING AN AUSTENITIC DECOMPOSITION PRODUCT CONTAINING MARTENSITE, AND FURTHER CHARACTERIZED IN THAT SAID COATING IS CAPABLE OF BEING HEAT TREATED AT A TEMPERATURE BELOW THE MELTING POINT OF THE METAL SUBSTRATE.
Claim 3
Dependent Claim
53 words
The method of claim 1, wherein the powder composition prior to spraying is a pre-alloyed composition characterized in that the titanium carbide grains in the particles thereof are rounded and dispersed through a steel matrix, such that the resulting adherent coating is characterized by the presence of said rounded grains of titanium carbide.
Claim 4
Dependent Claim
227 words
The method of claim 2, characterized in that the steel matrix is selected from the group consisting of (A) about 1 to 6% Cr, about 0.3 to 6% Mo, about 0.3 to 0.8% C and the balance essentially iron; (B) about 6% to 12% Cr, about 0.5 to 5% Mo, about 0.6 to 1.2% C, up to about 5% W, up to about 2% V, up to about 3% Ni, up to about 5% Co and the balance esSentially iron; and (C) a high nickel alloy steel containing about 10 to 30% Ni, about 0.2 to 9% Ti, up to about 5% Al, the sum of the Ti and Al content not exceeding about 9%, up to about 25% Co, up to about 10% Mo, substantially the balance of the matrix being at least about 50% iron, the metals making up the matrix composition being proportioned such that when the nickel content ranges from about 10 to 22% and the sum of Al and Ti is less than about 1.5%, the molybdenum and cobalt contents are each at least about 2%, and such that when the nickel content ranges from about 18 to 30% and the molybdenum content is less than 2%, the sum of Al and Ti exceeds 1.5%; said matrix produced from compositions (A), (B) and (C) being characterized metallographically by the presence of martensite.
Claim 5
Dependent Claim
28 words
The method of claim 3, wherein the metal substrate is characterized by a thermal and electrical conductivity relative to copper taken as 1 of at least about 0.2.
Claim 6
Dependent Claim
26 words
The method of claim 3, wherein the metal substrate is selected from the group consisting of steel and non-ferrous metals having a melting point above 1,100*F.
Claim 7
Dependent Claim
26 words
The method of claim 4, wherein said metal substrate is selected from the group consisting of aluminum, copper and silver and alloys based on said metals.
Claim 8
Dependent Claim
47 words
The method of claim 3, wherein the coating is derived from composition (B) and wherein after the coated substrate has been produced, it is tempered at a temperature of about 900*F to 1, 050*F for a time at least sufficient to increase the hardness of the coating.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |