US4519840A — High strength, wear and corrosion resistant coati…

Claim 1

Independent Claim 47 words

A coating composition applied to a substrate by a thermal spray process which consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.

Claim 2

Dependent Claim 47 words

A coating composition applied to a substrate by a thermal spray process which consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.

Claim 3

Dependent Claim 41 words

A coating composition according to claim 1 consisting essentially of from about 14.0 to about 18.0 weight percent cobalt, from about 2.0 to about 5.5 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.

Claim 4

Dependent Claim 34 words

A coating composition according to claim 1 having a mechanical strength sufficient to withstand an hydraulic pressure in excess of about 20,000 pounds per square inch at a coating thickness of about 0.006 inch.

Claim 5

Dependent Claim 18 words

A coating composition according to claim 1 having a hardness value in excess of 900 DPH 300 .

Claim 6

Dependent Claim 56 words

A coating composition according to claim 1 wherein the substrate is a metallic material selected from the group consisting of steel, stainless steel, iron base alloys, nickel, nickel base alloys, cobalt, cobalt base alloys, chromium, chromium base alloys, titanium, titanium base alloys, aluminum, aluminum base alloys, copper, copper base alloys, refractory metals, and refractory-metal base alloys.

Claim 7

Dependent Claim 24 words

A coating composition according to claim 1 wherein the substrate is a non-metallic material selected from the group consisting of carbon, graphite and polymers.

Claim 8

Dependent Claim 56 words

A powdered coating composition for applying a high strength, wear and corrosion resistant coating onto a substrate by a thermal spray process consisting essentially of from about 11.5 to about 14.5 weight percent cobalt, from about 1.5 to about 5.5 weight percent chromium, from about 4.0 to about 5.5 weight percent carbon and the balance tungsten.

Claim 9

Dependent Claim 56 words

A powdered coating composition for applying a high strength, wear and corrosion resistant coating onto a substrate by a thermal spray process consisting essentially of from about 11.5 to about 14.5 weight percent cobalt, from about 1.5 to about 5.5 weight percent chromium, from about 4.0 to about 5.5 weight percent carbon and the balance tungsten.

Claim 10

Dependent Claim 14 words

A powdered coating composition according to claim 7 consisting of cast and crushed powders.

Claim 11

Dependent Claim 52 words

An article comprising a substrate and a coating applied to said substrate by a thermal spray process, said coating consisting essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to 4.5 weight percent carbon and the balance tungsten.

Claim 12

Dependent Claim 52 words

An article comprising a substrate and a coating applied to said substrate by a thermal spray process, said coating consisting essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to 4.5 weight percent carbon and the balance tungsten.

Claim 13

Dependent Claim 43 words

An article according to claim 9 wherein said coating consists essentially of from about 14.0 to about 18.0 weight percent cobalt, from about 2.0 to about 5.5 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.

Claim 14

Dependent Claim 94 words

An article comprising a substrate and a coating applied to said substrate by a thermal spray process, wherein said coating consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to 4.5 weight percent carbon and the balance tungsten, and wherein said coating has a hardness value in excess of 900 DPH 300 and a mechanical strength sufficient to withstand an hydraulic pressure in excess of about 20,000 pounds per square inch at a coating thickness of about 0.006 inch.

Claim 15

Dependent Claim 94 words

An article comprising a substrate and a coating applied to said substrate by a thermal spray process, wherein said coating consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to 4.5 weight percent carbon and the balance tungsten, and wherein said coating has a hardness value in excess of 900 DPH 300 and a mechanical strength sufficient to withstand an hydraulic pressure in excess of about 20,000 pounds per square inch at a coating thickness of about 0.006 inch.

Claim 16

Dependent Claim 30 words

An article according to claim 11 wherein the major phase of said coating comprises W 2 C and wherein at least one minor phase of said coating comprises cubic WC.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-05-27	1988-11-26	1989-05-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-05-27	1992-11-26	1993-05-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-05-27	1996-11-26	1997-05-28	$7700.00	Window Closed / Lapsed

High strength, wear and corrosion resistant coatings

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