Abstract: CrN thin films were deposited on 316L stainless steel substrate by cathodic arc ion plating technique. The topography, composition and mechanical properties of CrN thin films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and nano indentation. In order to study the effects of the counter pair materials of Si3N4 and 52100 steel on the dry sliding friction behavior of CrN thin film and 316L stainless steel, the reciprocating sliding friction wear test on CrN thin film and 316L stainless steel against Si3N4 ceramic balls and 52100 balls were carried out under three kinds of loads (2 N, 5 N and 8 N). The morphologies of wear scars were observed by using scanning electron microscope, and the sliding wear mechanisms of CrN film and 316L stainless steel were discussed. The results showed that the surface of CrN thin film was smooth, and the defect was less. The nano hardness and the elastic modulus of the CrN thin film were about 28 GPa and 350 GPa, respectively. Compared with the Si3N4 ceramic ball, the friction coefficient of the CrN film against the 52100 steel ball was relatively small (about 0.7) and more stable. The friction coefficient of 316L stainless steel was much larger than that of CrN film. The wear mechanisms of CrN films against Si3N4 ceramic ball was mainly abrasive wear, and against 52100 steel ball was delamination and abrasive wear of the composite. The wear mechanisms of 316L stainless steel were abrasive wear and plastic deformation of the composite. When sliding against Si3N4 ceramic ball, the wear mechanisms of CrN films was mainly abrasive particle wear, accompanied by a small amount of oxidation and adhesion, and the wear mechanisms of 316L stainless was mainly abrasive wear and plastic deformation, accompanied by a small amount of oxidation and adhesion. When sliding against 52100 steel ball, the wear mechanisms of CrN films was mainly adhesive wear, accompanied by a small amount of oxidation, and the wear mechanisms of 316L stainless was mainly adhesive wear, accompanied by a small amount of oxidation and grinding particle abrasion. The wear of CrN thin films with two kinds of wear resistance ball were less than 316L stainless steel matrix wear, indicating that CrN film effectively improve the wear resistance of the matrix.
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2017, Vol. 31 
