Fabricating the Tribological Properties and Investigating of Ni۳Al-MoS۲ Composite Coating

Self-lubricant coatings are among the newly improved type of coatings to reduce the coefficient of friction and protect the substrate in various conditions. Magnetron sputtering is the best technology to fabricate coatings with good morphology. In this paper, the tribological properties of magnetron sputtered Ni۳Al-MoS۲ coating on ۴۳۴۰ steel are reported. For this purpose, five tablets of Ni۳Al-۳۰ wt.% MoS۲ were prepared as the target material and were placed in a copper holder. At last, we have sputtered from the target using the best sputtering condition to get a good morphology and microstructure of the coating. The morphology and microstructure of the coatings were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The tribological properties of Ni۳Al-MoS۲ coating were investigated using a ball-on-disc tribometer at atmospheric conditions at room temperature. SEM was used to examine the morphology of the wear track after the ball-on-disc test. The Ni۳Al-MoS۲ composite coating showed lower frictions coefficient and higher wear resistance because of the hard Ni۳Al matrix and soft MoS۲ particles.

Keywords:

Ni۳Al , MoS۲ , Magnetron sputtering , Wear