Effect of PCL/HA Nanocomposite Coating on the Degradation Rate and Mechanical Integrity of Mg/HA Biocomposites During Exposure in SBF

• Published in: Arabian journal for science and engineering (2011) Vol. 49; no. 2; pp. 2077 - 2094
• Main Authors: Bagheri, A., Sedighi, M., Shamsi, M.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.02.2024; Springer Nature B.V
• Subjects: Apatite; Biodegradation; Compression tests; Corrosion rate; Degradation; Engineering; Extrusion coating; Feed rate; Humanities and Social Sciences; Hydroxyapatite; Integrity; Magnesium; Modulus of elasticity; multidisciplinary; Nanocomposites; Nanofibers; Orthopaedic implants; Orthopedics; Research Article-Mechanical Engineering; Science; Submerging; Substrates; Biodegradation; PCL; Hydroxyapatite; Nanofibers; Magnesium composites; Mechanical integrity
• ISSN: 2193-567X; 1319-8025; 2191-4281
• DOI: 10.1007/s13369-023-08134-8

Biodegradable metals with a degradation rate proportional to the tissue repair process have become a new generation of orthopedic implants. Magnesium-based composites are an attractive candidate for temporary implants due to their biodegradability and elastic modulus close to the bone. However, high corrosion rates have caused uncontrolled degradation of these materials in the physiological environment. In this research, Mg/HA composite samples were fabricated by the stir casting and extrusion processes. The samples were then coated with PCL and PCL/HA nanofibers. The coating process involved electrospinning at a voltage of 10 kV, a feed rate of 0.01 ml/min, and a tip-to-collector distance of 10 cm. Following the evaluation of the biodegradation behavior, uniaxial compression tests were performed after immersion periods. For a 14-day immersion, the PCL/2.5%HA coating reduced the corrosion rate of the bare composite specimen to 0.95 mm/year. It was due to the porous composite coating and HNO 3 treatment that controlled the destruction of samples. The predominant mechanical integrity of this sample has been preserved after 14 days. Specifically, the yield strength decreased by 28.9% to 103 MPa (compared to 53.7% for uncoated composite) after this period. It is accomplished by providing a suitable substrate for the growth of apatite and protection by the coating. Therefore, coating Mg/HA implants with PCL/2.5%HA nanofibers can cause controlled degradation and improved mechanical integrity preservation.