Turbocharger housing with a conversion coating and methods of making the conversion coating
AssigneeGM Global Technology Operations LLC
InventorsThomas A. Perry, Carnelle E. Williams, Julian Velosa, Anil K. Sachdev
Life of this patent
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Abstract
A method for increasing wear resistance of a turbocharger includes exposing at least a bearing surface of a center housing of the turbocharger to a gas nitrocarburizing process or a plasma nitrocarburizing process, thereby forming a conversion coating impregnated onto the at least the bearing surface.
Claims8
A method for increasing wear resistance of a turbocharger, comprising:
- heating at least a bearing surface of a center housing at a predetermined temperature;
- exposing the at least the bearing surface of the center housing to a nitrocarburizing salt bath at a temperature that is below a service temperature of the center housing;
- exposing the at least the bearing surface of the center housing to an oxidizing salt bath at a temperature that is below the temperature of the nitrocarburizing salt bath;
- and
- cooling the bearing surface.
A method for increasing wear resistance of a turbocharger, comprising exposing at least a bearing surface of a center housing of a turbocharger to a plasma nitrocarburizing process, thereby forming a conversion coating impregnated onto the at least the bearing surface;
- wherein prior to the exposing, the method further comprises masking the center housing such that the at least the bearing surface remains exposed.
Dependencies are inferred from the claim text.