Fabrication and Processing of Magnesium-Based Metal Matrix Nanocomposites for Bioabsorbable Implants

Abstract

Disclosed is a novel magnesium (Mg)-based metal-matrix nanocomposite (MMNC) fabricated using ultrasound melt treatment to promote the de-agglomeration of the bioactive glass-ceramic nanoparticles and the homogenization of the melt. The cast samples were then heat treated, machined, and hot rolled to reduce grain size and remove structural defects. Standard mechanical and electrochemical tests were conducted to determine the effect of fabrication and processing on mechanical and corrosion properties of MMNCs. Compression tests were conducted to measure yield strength, and ultimate compressive strength, and elongation at break. Potentiodynamic polarization tests, electrochemical impedance spectroscopy, and static immersion testing were conducted to determine the corrosion rate. Results showed that the combination of ultrasonic melt processing and thermomechanical processing significantly affected the corrosion behavior and mechanical properties of samples. Samples that underwent both processes had significantly higher yield stress and ultimate compressive strength and had significant changes in the corrosion rate at each time point measured. Implants comprising the MMNC and uses thereof are also disclosed.

Dependencies are inferred from the claim text.