Preparation of Nanohydroxyapatite-Carbon Nanotube Composite ‎Coatings on 316L Stainless Steel Using Electrophoretic Deposition ‎

N ‎ anohydroxyapatite-carbon ‎nanotube composite coatings were ‎deposited via electrophoretic ‎deposition (EPD). AISI 316L ‎stainless steel and ethanol were ‎used as substrate and dispersing ‎medium, respectively. 5%wt ‎carbon nanotube (CNT) was used ‎as reinforcing phase. Uniform and ‎macrocrack-free coatings were ‎obtained both for hydroxyapatite ‎‎(HA) and HA-5%wt CNT coatings. ‎Scanning electron microscopy ‎‎(SEM) revealed that most of ‎microcracks in HA coating has ‎eliminated after introducing CNT ‎as reinforcing phase. The variation ‎of deposit weight by time and ‎voltage was measured both for HA ‎and HA-5%wt CNT coatings. ‎Thickness measurements revealed ‎that for both coatings, the ‎thickness increases with deposition ‎voltage. X-ray diffraction patterns ‎indicated that HA has not ‎decomposed after sintering at 850 ‎?C‏ ‏for 2 hr in argon atmosphere. ‎Prog. Color Colorants Coat. ‎‎5(2012), 47-53. © Institute for ‎Color Science and Technology.‎