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Materials 2017, 10(3), 307; doi:10.3390/ma10030307

Biodegradation Resistance and Bioactivity of Hydroxyapatite Enhanced Mg-Zn Composites via Selective Laser Melting

1
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
2
Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha 410008, China
3
School of Material Science and Engineering, Central South University, Changsha 410083, China
4
Human Reproduction Center, Shenzhen Hospital of Hongkong University, Shenzhen 518053, China
5
College of Chemistry, Xiangtan University, Xiangtan 411105, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Sofoklis Makridis
Received: 27 January 2017 / Revised: 8 March 2017 / Accepted: 13 March 2017 / Published: 17 March 2017
View Full-Text   |   Download PDF [11415 KB, uploaded 17 March 2017]   |  

Abstract

Mg-Zn alloys have attracted great attention as implant biomaterials due to their biodegradability and biomechanical compatibility. However, their clinical application was limited due to the too rapid degradation. In the study, hydroxyapatite (HA) was incorporated into Mg-Zn alloy via selective laser melting. Results showed that the degradation rate slowed down due to the decrease of grain size and the formation of protective layer of bone-like apatite. Moreover, the grain size continually decreased with increasing HA content, which was attributed to the heterogeneous nucleation and increased number of nucleation particles in the process of solidification. At the same time, the amount of bone-like apatite increased because HA could provide favorable areas for apatite nucleation. Besides, HA also enhanced the hardness due to the fine grain strengthening and second phase strengthening. However, some pores occurred owing to the agglomerate of HA when its content was excessive, which decreased the biodegradation resistance. These results demonstrated that the Mg-Zn/HA composites were potential implant biomaterials. View Full-Text
Keywords: selective laser melting; heterogeneous nucleation; bone-like apatite; second phase strengthening; biodegradation resistance selective laser melting; heterogeneous nucleation; bone-like apatite; second phase strengthening; biodegradation resistance
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Shuai, C.; Zhou, Y.; Yang, Y.; Feng, P.; Liu, L.; He, C.; Zhao, M.; Yang, S.; Gao, C.; Wu, P. Biodegradation Resistance and Bioactivity of Hydroxyapatite Enhanced Mg-Zn Composites via Selective Laser Melting. Materials 2017, 10, 307.

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