Preparation an‎d Characterization Of Hydroxyapatite Coating On F75 Alloy Implant Using Pulse Laser Deposition

CoCrMo alloys have involved substantial considerations as orthopedic implants due to their extraordinary biocompatibility and reliable mechanical behavior and properties. Though, comparable to additional bioinert metallic implants, CoCrMo alloys displays reduced bioactivity. So, it does not improve direct chemical bonding with host bone tissue that can lead to the implant failure. Consequently, the request of bioactive coatings on the metallic implants is essential in order to attain adequate bioactivity. Further, the request of coatings significantly reduces the rate of corrosion of metallic implant and so the release of toxic metallic ions into the nearby tissue. Hydroxyapatite (HA) coatings on the metallic implants have showed decent fixation to host bone and enhanced bone ingrroth into the implant. HA is the generally manufactured from both Calcium (Ca) and Phosphate (P) to produce (Ca10(PO4)6(OH)2) that used as a base material for covering mineral embeds because of its incredible biocompatibility and comparable the synthesis and structure to sclerous tissues of the human body. HA coatings on CoCrMo (F75) alloy substrates have been produced by Pulsed laser deposition (PLD) techniques. HA used in this search pressed at pressure (150MPa) with particle size (2.75 µm) and used as a target in the coating by (PLD) techniques. Surface characterization studies of the coatings such as XRD, SEM, AFM, and EDS to detect the amount of (Ca) and (P) in the coating layer were carried out. Then test the micro-hardness, surface roughness for HA coating. Corrosion behavior for uncoated and coated samples with a various number of pulses in Hank’s solution by using potential static polarization tests was achieved also, in this test we obtained a greatly improved in corrosion resistance of the samples B3 after coating by 88.91%.