ABSTRACT Background: 316 l st. st. are frequently used as orthopedic implants because of their mechanical properties and formability. Objective: This research aims to improve the surface of stainless steel by coating it with (HA). HA Used in this search pressed at pressure (150MPa) with particle size (2.745 µm) and used as a target in the coating by (PLD) techniques effects of the number of pulses (3000,4500 and 6000) on the coating layer properties have been studied. Effects of the annealing temperature (450 0C) for one hour and Under an empty atmosphere on the coating layer properties have been studied, also. Surface characterization studies of the coatings. Results: Results show The mechanical property of the coating was evaluated by Vickers microhardness and wear test. XRD analysis of coated sample indicates the formation of the HA layer. SEM results show evident improvement in microstructure and grow HA film with increasing in pulses number. In the bioactivity test, the percentage of (Ca ) and (P) are increased Significantly after 14 days of immersion in SBF which Confirms that the samples are bioactive. From above results conclude that PLD coating processes may be used to modify the surface of the 316 l st .st implant advice. They can provide a bioactive HAP top layer with good electrochemical and biochemical stability in the human body environment. The wear resistance of the 316 l samples increased after HA coatings and it increased also as the number of pulsed increase. Conclusion: Success of the study in the deposition of Hydroxyapatite (Ca10 (PO4)6 (OH)2) powders using pulsed laser deposition on st. st 316L.2. The film s microhardness increased with the increasing number of pulses. A significant decrease in wear rate for the coating sample was observed, It was (0.000062 cm3 ) after one hour compared with (0.00047 cm3) for the uncoated stainless steel sample .andAnother interesting increase in biocompatibility was achieved during the work for the coated sample compare to the uncoated 316 L stainless steel sample.
Conclusion: Based on the obtained result, the following conclusion is made: A significant decrease in wear was observed, It was(0.0008 cm3) after one hour compared with (0.0004cm3) for the uncoated stainless steel sample