Patent ID: 11906052
Assignee: TENNECO GMBH
Field: Surface technology, coating (Chemistry)
Classification: CPC C  F | IPC C  F

Claim 5:
6. The method of claim 1, wherein the end surfaces of the ring body are parallel to the center axis, the ring body has an inner surface facing toward the center axis, the ring body has a top surface extending from the inner surface to the outer surface and a bottom surface spaced from the top surface and extending from the inner surface to the outer surface, the inner surface is parallel to the center axis and the outer surface, the top surface is perpendicular to the center axis and parallel to the bottom surface, the ring body is formed of steel, the coating consists essentially of DLC or CrN, and the coating includes a plurality of grains disposed at angles relative to one another being applied to the outer surface; and applying none of the coating to the middle section of the outer surface.