The Influence of Hydroxyapatite and Alumina Particles on the Mechanical Properties and Corrosion Behavior of Mg-Zn Hybrid Composites for Implants
Considering the necessity for a biodegradable implant alloy with good biocompatibility and mechanical strength, dual ceramic particles of HAP and Al<sub>2</sub>O<sub>3</sub> were added to Mg-Zn alloy to produce a new hybrid composite using powder metallurgy. The paper reports...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/0d3c87c1d8974645a8e4fad223e5acbb |
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| Sumario: | Considering the necessity for a biodegradable implant alloy with good biocompatibility and mechanical strength, dual ceramic particles of HAP and Al<sub>2</sub>O<sub>3</sub> were added to Mg-Zn alloy to produce a new hybrid composite using powder metallurgy. The paper reports the mechanical and corrosion behaviour of Mg-Zn/HAP/Al<sub>2</sub>O<sub>3</sub> hybrid composites containing variable wt.% HAP and Al<sub>2</sub>O<sub>3</sub> with 15 wt.% total ceramic content. The powders of Mg, Zn, Al<sub>2</sub>O<sub>3</sub> and HAP were milled in a high-energy ball mill, and then compacted under 400 MPa and sintered at 300 °C. Density and compression strength increased with increasing Al<sub>2</sub>O<sub>3</sub> content. HAP facilitated weight gain in Hanks balanced salt solution due to deposition of an apatite layer which promoted anodic behaviour with higher corrosion resistance. A hybrid composite of Mg alloy with 5 wt.% Al<sub>2</sub>O<sub>3</sub> and 10 wt.% HAP displayed 153 MPa compressive strength, 1.37 mm/year corrosion resistance and bioactivity with a CA:P ratio of 1:1.55 and appears to be the most promising biodegradable implant material tested. |
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