In this research, Evaluation of adhesion and loadbearing of physical vapor deposition nitride coating after applay interlayer nickel-phosphorus by electroless. for this intention disk samples with a diameter of 5 centimeter was prepard from CK45 steel and it was prepared to coating after do cycles heat treatment. The effect of type and temperature of thermal treatment on the substrate was investigated by hardness and wear tests. For Evaluation effect of interlayer, electroless Ni-P applied on samples for two thickness 5 and 20 micrometer. and then TiN/CrN/TiCrN nitride multilayer coating was deposited in two thickness 2 and 5 micron by cathode-arc industrial. Cross sections of the specimens were examined by scanning electron microscopy and thickness was examined. X-ray diffraction test was used to identify the type of phases and compounds of the coating and interlayer. Based on the X-ray diffraction pattern, the presence of chromium nitride and titanium in coatings and the Ni 3 P phase were confirmed in the structure of Ni-P electrons. Structural analysis and characterization of the coatings were performed by scanning electron microscopy, microscopy and optical microscopy. The study of tribological behavior, loading and adhesion of coatings was performed by using a pin on disk test, static loadbearing and Rockwell C adhesion test. The results showed that the presence of the interlayer of electroless nickel-phosphorus by reduce the difference between the hardness of the coating and the substrate would improve the adhesion and loadbearing of the PVD coating. The optimal thickness of the interlayer to achieve better loadbearing and adhesion properties based on experiment results was analyzed in this study; increase in the thickness of the interlayer layer up to 20 microns reduces the coefficient of friction of the coating and by increasing the adhesion of the coating to the interlayer, It improves wear resistance and loadbearing. Keywords: itride coatings, physical vapor deposition, nickel-phosphorus electroless, adhesion , loadbearing.
