Wear resistant coating for piston rings
View Patent ↗A wear resistant coating for protecting surfaces undergoing sliding contact is disclosed. The wear resistant coating is applied by high velocity oxygen-fuel (HVOF) deposition of a powdered blend of the coating constituents. The powdered blend includes a nickel-chromium alloy, chromium carbide, and molybdenum. The disclosed coating should find use as a bearing surface on piston rings, cylinder liners, and other components of a power cylinder assembly of an internal combustion engine.
1. A wear resistant coating for protecting a surface, the wear resistant coating applied by high velocity oxygen-fuel deposition of a powder, the powder comprising a blend of:
about 18 13 wt. % to about 35 43 wt. % of a nickel-chromium alloy;
about 35 25 wt. % to about 53 64 wt. % chromium carbide; and
about 15 wt. % to about 50 wt. % molybdenum,
wherein chromium from the nickel-chromium alloy is at least 7.2 wt. % of the blend.
2. The wear resistant coating of claim 1 , wherein the powder comprises a blend of:
about 28 wt. % of the nickel-chromium alloy;
about 42 wt. % chromium carbide; and
about 30 wt. % molybdenum.
3. The wear resistant coating of claim 1 , wherein the powder comprises a pre-alloyed blend of nickel-chromium alloy and chromium carbide.
4. The wear resistant coating of claim 1 , wherein the chromium carbide component of the powder comprises Cr 7 C 3 and Cr 23 C 6 .
5. A piston ring comprising an annular body having an outer radial periphery, the outer radial periphery having a wear resistant coating applied by high velocity oxygen-fuel deposition of a powder, the powder comprising a blend of:
about 18 wt. % to about 35 wt. % of a nickel-chromium alloy;
about 35 wt. % to about 53 wt. % chromium carbide; and about 15 wt. % to about 50 wt. % molybdenum,
wherein chromium from the nickel-chromium alloy is at least 7.2 wt. % of the blend.
6. The piston ring of claim 5 , wherein the powder comprises a blend of:
about 28 wt. % of the nickel-chromium alloy;
about 42 wt. % chromium carbide; and
about 30 wt. % molybdenum.
7. The piston ring of claim 5 , wherein the powder comprises a pre-alloyed blend of nickel-chromium alloy and chromium carbide.
8. The piston ring of claim 5 , wherein the chromium carbide component of the powder comprises Cr 7 C 3 and Cr 23 C 6 .
9. A wear resistant coating for protecting a surface, the wear resistant coating applied by high velocity oxygen-fuel deposition of a powder, the powder comprising a blend of:
about 28 wt. % of a nickel-chromium alloy;
about 42 wt. % chromium carbide; and
about 30 wt. % molybdenum.
10. A piston ring comprising an annular body having an outer radial periphery, the outer radial periphery having a wear resistant coating applied by high velocity oxygen-fuel deposition of a powder, the powder comprising a blend of:
about 28 wt. % of a nickel-chromium alloy;
about 42 wt. % chromium carbide; and
about 30 wt. % molybdenum.
11. The piston ring of claim 1 , wherein there is about 18 wt % to about 35 wt. % of a nickel - chromium alloy.
12. The piston ring of claim 1 , wherein there is about 35 wt % to about 53 wt. % of a chromium carbide.
13. The piston ring of claim 1 , wherein there is about 18 wt % to about 35 wt. % of a nickel - chromium alloy and about 35 wt % to about 53 wt. % of a chromium carbide.