Author/Authors :
Baibordi، A. نويسنده Department of Materials Engineering, Shiraz University, Shiraz, Iran , , Bina، .M .H نويسنده Department of Advanced Materials and Renewable Energy, Iranian Research Organization for Science and Technology, Tehran, Iran , , Amini، K. نويسنده Department of Engineering, Islamic Azad University, Tiran Branch, Tiran, Iran , , Dehghan، A. نويسنده Department of Materials Engineering, Shiraz University, Shiraz, Iran ,
Abstract :
In this research, tribological characteristics of Ni-P electroless coating and double-layered Ni-P/Ni-B electroless
coating were studied. For this purpose, Ni-P electroless coating with 25 ?m thickness was initially applied to the
surface of steel Ck45 samples; then, a double-layered Ni-P/Ni-B electroless coating, including inner layer of
Ni-P with 15 ?m thickness and outer layer of Ni-B with 10 ?m thickness, was applied to the surface of similar
samples and were heat treated at 400?C for 1 h. Effect of heat treatment on morphology, structural variations and
wear behavior of coating was investigated using different tests such SEM, XRD and pin on disk wear test at room
temperature. Hardness of the obtained coatings was measured by a Vickers microhardness machine prior and after
heat treatment of the samples. The results showed that the double-layer coating with the same thickness in each
layer improved hardness and wear resistance compared to the single-layer coating. Heat treatment led also to
the creation of nano crystalline structure; therefore, hardness and wear resistance of the coating increased due to
change in structure from amorphous to crystalline structure and created rigid phases of Ni3P.
