F-0229 Wear properties of Cr-Ni-N coating by slurry jet tester

Abstract

For the evaluation of tribological properties of thin hard coatings, several experimental techniques are normally used, such as scratch testing and testing against abrasive, erosive, and sliding wear, and fretting. We have proposed slurry jet, a new type of solid particle impact test, in order to quickly and sensitively evaluate wear properties of thin coatings. In this paper, slurry jet 1 μm alumina particles were impacted at high velocity perpendicular to thin Cr-Ni-N coatings deposited on an austenitic stainless steel (SUS304) substrate material. For the same kind of coatings, the coating with nitrided substrate exhibited the higher wear resistance compared with untreated substrate. When the Ni concentration increases, the hardness becomes small and the wear rate increases. The Cr-Ni-N coatings with the larger hardness proved to have the higher wear resistance.