Hydroxyapatite Coating On 316L Stainless Steel Using Dip Coating Technique

Abstract

316L stainless steel is one of the metal biomaterials used in implant applications because it has excellent mechanical strength. To improve the biocompatibility and activity of metals, a coating on metal surfaces is required. 316L stainless steel is coated with hydroxyapatite using a dip coating technique. Firstly, the suspension was prepared by mixing 10 grams of hydroxyapatite, 1 gram of sago starch, with distilled water with certain weight which was then stirred at a speed of 250 rpm for 20 hours. The substrate then dipped 1 time with dipping time for 20 seconds. Coating hydroxyapatite was sintered at temperatures of 600°C, 700°C and 800°C for 1 hour. The results show that the thickness of the hydroxyapatite layer on the substrate has decreased with increasing amount of distilled water used. However, the thickness of the layer increases with increasing sintering temperature. The best value of shear strength was obtained in the addition of 16 grams of distilled water with sintering temperature of 800°C which is 11.78 MPa. Furthermore, the coating attached to all substrates is hydroxyapatite with an average composition of 99.37% as evidenced by the results of XRD analysis.