The Preparation Of Porous Magnesium And Magnesium Alloy Surface Calcium Phosphate Coating

Biomedical metallic materials possess fine mechanics properties which are used to restore and replace the hard tissue of human bodies. But the bad resistance to erosion and biocompatibility make the metallic materials away from the ideal substituted material.The module of elasticity of Mg is close to the bone of human bodied, and the Mg ion is needed to the body. But, the low resistance to erosion makes the mg substrate destroyed badly. HAP is a good type of biomedical material, which can form a bond with the neighboring bone after planted in the human body, but the brittleness of the ceramic limits it's use.The article based on the idea of modern bionic materials, studied the process of work, micro-morphology, structure of the porous Mg and the coating of calcium phosphate on the Mg alloy .Firstly, with the Mg powder, K₂CO₃ powder etc as raw material, the article made magnesium metallic foams by powder manufacturing process. The open-cellular foams have average characteristics: pore size: 100²00um, porosity: 40⁵0%.secondly, the article gain the HAP by the chemical solution deposition. Finally, After pre-handled the substrate. The substrate was made of coating by means of electrophoresis deposition. The author studied the influence of different conditions of the process on deposition, such as the temperature, PH of the solution and the time of deposition, and the influence of the hydrothermal synthesis on the film of the substrate. The results show that, at 30℃, PH⁸, after 50min, the substrate can get better calcium phosphate film. After the hydrothermal synthesis, the substrates were eroded more acutely by ammonia solution than sodium hydroxide solution.From the SEM, XRD, optical microscope, etc, the microstructure and composition of the samples were revealed.