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Abstract
Mg matrix in situ composites were fabricated from Mg and ZnO powder by a spark plasma sintering method. The composition and microstructure of the sintered samples were characterized. Corrosion properties of fabricated composites were evaluated by immersion and by electrochemical tests using Hanks’ solution. The results showed that the formation of in situ products improved significantly the corrosion resistance of the fabricated composites compared with pure Mg; Mg-10 wt % ZnO composites especially exhibited the lowest corrosion rate. In addition, an energy-dispersive X-ray (EDX) analysis showed that calcium phosphate formed as a corrosion product on the surface of Mg-10 wt % ZnO composites, while Mg(OH)2 appeared as a corrosion product on the surface of Mg-20 wt % ZnO composite. The findings suggested Mg-10 wt % ZnO composite as a potential candidate for temporary implant application.
Highlights
In recent decades, traditional metallic biomaterials including pure Ti and its alloys, CoCr alloys, and stainless steel have been widely applied into bone replacement and bone fixation devices in order to repair bone fractures or support in the healing process
Zn and its compounds as reinforcements in order to improve corrosion resistance, Mg-matrix in situ composites were fabricated from homogeneously mixed Mg-ZnO powder via the spark plasma sintering (SPS) technique
The mixed powders were set inside the Tungsten-Carbide die (NJS, Yokohama, Japan) of 120 mm in height and 15 mm in an inner diameter for the spark plasma sintering using a 511S, Syntex SPS system
Summary
Traditional metallic biomaterials including pure Ti and its alloys, CoCr alloys, and stainless steel have been widely applied into bone replacement and bone fixation devices in order to repair bone fractures or support in the healing process. Cao et al [18] employed a spark plasma sintering (SPS) technique and fabricated Mg matrix in situ composites with excellent mechanical properties from mixed Mg-ZnO powder. Zn and its compounds as reinforcements in order to improve corrosion resistance, Mg-matrix in situ composites were fabricated from homogeneously mixed Mg-ZnO powder via the spark plasma sintering (SPS) technique. During the SPS sintering process, spark plasma generated by direct pulse current associated with uniaxial pressure on powder resulted in lower temperatures and shorter sintering times than conventional sintering methods. These advantages make SPS an effective sintering method to fabricate. The corrosion property of fabricated composites was investigated by various corrosion tests
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