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This work was a portion of a larger DOE/ITP Grand Challenge project led by Eaton Corporation and which included Ames Lab, Borg Warner Morse, and Pratt and Whitney Rocketdyne. The current report summarizes work done under a CRADA between ORNL and Eaton. Tests of two types were performed at ORNL during the course of this work: (1) simulations of timing chain wear and friction under reciprocating conditions, and (2) pin-on-disk screening tests for bearings undergoing unidirectional sliding. The four materials supplied for evaluation in a timing chain link simulation were hardened type 440B stainless steel, nitrided type 440B stainless steel, VC-coated type 52100 bearing steel, and (ZrTi)B-coated type 52100 bearing steel. Reciprocating wear tests revealed that the VC coating was by far the most wear resistant. In friction, the nitrided stainless steel did slightly better than the other materials. The results will also be included in the overall project report by Eaton Corp

ULTRACOATINGS - Enabling Energy and Power Solutions in High Contact Stress Environments Through Next Generation Nanocoatings