US4612256A — Wear-resistant coating

Claim 1

Independent Claim 124 words

Wear-resistant coating on a machine part which is subject to friction wear, said coating being applied by a flame spraying process and comprising five sprayed-on layers formed of successively applied spray powder mixtures, comprising, in succession, starting from the machine part surface to which said coating is applied: 25% Mo, 50% Mo 2 C and/or Cr 3 C 2 and 25% binder metal; 35% Mo, 40% Mo 2 C and/or Cr 3 C 2 and 25% binder metal; 45% Mo, 30% Mo 2 C and/or Cr 3 C 2 and 25% binder metal; 55% Mo, 20% Mo 2 C and/or Cr 3 C 2 and 25% binder metal; and 65% Mo, 10% Mo 2 C and/or Cr 3 C 2 and 25% binder metal.

Claim 2

Dependent Claim 124 words

Wear-resistant coating on a machine part which is subject to friction wear, said coating being applied by a flame spraying process and comprising five sprayed-on layers formed of successively applied spray powder mixtures, comprising, in succession, starting from the machine part surface to which said coating is applied: 25% Mo, 50% Mo 2 C and/or Cr 3 C 2 and 25% binder metal; 35% Mo, 40% Mo 2 C and/or Cr 3 C 2 and 25% binder metal; 45% Mo, 30% Mo 2 C and/or Cr 3 C 2 and 25% binder metal; 55% Mo, 20% Mo 2 C and/or Cr 3 C 2 and 25% binder metal; and 65% Mo, 10% Mo 2 C and/or Cr 3 C 2 and 25% binder metal.

Claim 3

Dependent Claim 32 words

Wear-resistant coating as defined in claim 1, wherein the machine part is a piston ring for an internal combustion engine, and said coating is on the bearing faces of the piston ring.

Claim 4

Dependent Claim 18 words

Wear-resistant coating as defined in claim 1, wherein the flame spray process is a plasma jet spraying process.

Claim 5

Dependent Claim 24 words

Wear-resistant coating as defined in claim 1, wherein the machine part is provided with a groove and said coating is disposed in the groove.

Claim 6

Dependent Claim 26 words

Wear-resistant coating as defined in claim 1, further comprising an adhesion improving layer applied to the machine part before the application of said superposed sprayed-on layers.

Claim 7

Dependent Claim 30 words

Wear-resistant coating as defined in claim 5, wherein said adhesion improving layer is composed of at least one of molybdenum, a nickel-chromium alloy, a nickel-aluminum alloy and a nickel-chromium-aluminum alloy.

Claim 8

Dependent Claim 33 words

Wear-resistant coating as defined in claim 1, wherein said superposed sprayed-on layers have respectively different porosities which increase progressively from the layer adjacent the machine part to the outermost layer of said coating.

Claim 9

Dependent Claim 19 words

Wear-resistant coating as defined in claim 1, wherein all of said layers have at least approximately the same thickness.

Claim 10

Dependent Claim 102 words

Wear-resistant coating on a machine part which is subject to friction wear, said coating being applied by a flame spraying process and comprising five superposed sprayed-on layers which are formed of spray powder mixtures having the following composition, in succession, starting from the machine part surface to which said coating is applied: 20% Mo, 60% ferrochromium and/or chromium and 20% binder metal; 30% Mo, 50% ferrochromium and/or chromium and 20% binder metal; 40% Mo, 40% ferrochromium and/or chromium and 20% binder metal; 50% Mo, 30% ferrochromium and/or chromium and 20% binder metal; 60% Mo, 15% ferrochromium and/or chromium and 25% binder metal.

Claim 11

Dependent Claim 102 words

Wear-resistant coating on a machine part which is subject to friction wear, said coating being applied by a flame spraying process and comprising five superposed sprayed-on layers which are formed of spray powder mixtures having the following composition, in succession, starting from the machine part surface to which said coating is applied: 20% Mo, 60% ferrochromium and/or chromium and 20% binder metal; 30% Mo, 50% ferrochromium and/or chromium and 20% binder metal; 40% Mo, 40% ferrochromium and/or chromium and 20% binder metal; 50% Mo, 30% ferrochromium and/or chromium and 20% binder metal; 60% Mo, 15% ferrochromium and/or chromium and 25% binder metal.

Claim 12

Dependent Claim 32 words

Wear-resistant coating as defined in claim 9, wherein the machine part is a piston ring for an internal combustion engine, and said coating is on the bearing faces of the piston ring.

Claim 13

Dependent Claim 18 words

Wear-resistant coating as defined in claim 9, wherein the flame spray process is a plasma jet spraying process.

Claim 14

Dependent Claim 24 words

Wear-resistant coating as defined in claim 9, wherein the machine part is provided with a groove and said coating is disposed in the groove.

Claim 15

Dependent Claim 26 words

Wear-resistant coating as defined in claim 9, further comprising an adhesion improving layer applied to the machine part before the application of said superposed sprayed-on layers.

Claim 16

Dependent Claim 30 words

Wear-resistant coating as defined in claim 13, wherein said adhesion improving layer is composed of at least one of molybdenum, a nickel-chromium alloy, a nickel-aluminum alloy and a nickel-chromium-aluminum alloy.

Claim 17

Dependent Claim 33 words

Wear-resistant coating as defined in claim 9, wherein said superposed sprayed-on layers have respectively different porosities which increase progressively from the layer adjacent the machine part to the outermost layer of said coating.

Claim 18

Dependent Claim 19 words

Wear-resistant coating as defined in claim 9, wherein all of said layers have at least approximately the same thickness.

Claim 19

Dependent Claim 174 words

Wear-resistant coating on a machine part which is subject to friction wear, said coating being applied by a flame spraying process and comprising five sprayed-on layers which are composed of five successively applied spray powders having the following composition, starting from the machine part surface to which said coating is applied: 55% Al 2 O 3 , 35% TiO 2 and 10% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 ; 40% Al 2 O 3 , 25% TiO 2 , 10% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 , and 25% binder metal; 55% Al 2 O 3 , 35% TiO 2 and 10% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 ; 40% Al 2 O 3 , 25% TiO 2 , 10l% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 , and 25% binder metal; 55% Al 2 O 3 , 35% TiO 2 and 10% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 .

Claim 20

Dependent Claim 174 words

Wear-resistant coating on a machine part which is subject to friction wear, said coating being applied by a flame spraying process and comprising five sprayed-on layers which are composed of five successively applied spray powders having the following composition, starting from the machine part surface to which said coating is applied: 55% Al 2 O 3 , 35% TiO 2 and 10% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 ; 40% Al 2 O 3 , 25% TiO 2 , 10% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 , and 25% binder metal; 55% Al 2 O 3 , 35% TiO 2 and 10% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 ; 40% Al 2 O 3 , 25% TiO 2 , 10l% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 , and 25% binder metal; 55% Al 2 O 3 , 35% TiO 2 and 10% La 2 O 3 and/or Nb 2 O 5 +CaCO 3 .

Claim 21

Dependent Claim 32 words

Wear-resistant coating as defined in claim 17, wherein the machine part is a piston ring for an internal combustion engine, and said coating is on the bearing faces of the piston ring.

Claim 22

Dependent Claim 18 words

Wear-resistant coating as defined in claim 17, wherein the flame spray process is a plasma jet spraying process.

Claim 23

Dependent Claim 24 words

Wear-resistant coating as defined in claim 17, wherein the machine part is provided with a groove and said coating is disposed in the groove.

Claim 24

Dependent Claim 26 words

Wear-resistant coating as defined in claim 17, further comprising an adhesion improving layer applied to the machine part before the application of said superposed sprayed-on layers.

Claim 25

Dependent Claim 30 words

Wear-resistant coating as defined in claim 21, wherein said adhesion improving layer is composed of at least one of molybdenum, a nickel-chromium alloy, a nickel-aluminum alloy and a nickel-chromium-aluminum alloy.

Claim 26

Dependent Claim 33 words

Wear-resistant coating as defined in claim 17, wherein said superposed sprayed-on layers have respectively different porosities which increase progressively from the layer adjacent the machine part to the outermost layer of said coating.

Claim 27

Dependent Claim 19 words

Wear-resistant coating as defined in claim 17, wherein all of said layers have at least approximately the same thickness.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-09-15	1990-03-17	1990-09-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-09-15	1994-03-17	1994-09-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-09-15	1998-03-17	1998-09-16	$7700.00	Window Closed / Lapsed

Wear-resistant coating

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