AZ91 Magnesium Alloy/Porous Hydroxyapatite Composite for Potential Application in Bone Repair

doi:10.1016/j.jmst.2016.06.010

材料科学与技术 ›› 2016, Vol. 32 ›› Issue (9): 858-864.DOI: 10.1016/j.jmst.2016.06.010

收稿日期:2015-08-04 接受日期:2015-11-04 出版日期:2016-09-20 发布日期:2016-11-02

AZ91 Magnesium Alloy/Porous Hydroxyapatite Composite for Potential Application in Bone Repair

Chen Bin^1,^*(),Yin Kai-Yang¹,Lu Tian-Feng¹,Sun Bing-Yi¹,Dong Qing¹,Zheng Jing-Xu¹,Lu Chen¹,Li Zhan-Chun²

¹ School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
² Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China

Received:2015-08-04 Accepted:2015-11-04 Online:2016-09-20 Published:2016-11-02
Contact: Chen Bin

摘要/Abstract

Abstract:

AZ91/HA composite was prepared by AZ91 magnesium alloy and porous HA using squeeze casting method. The microstructure and mechanical property of the AZ91/HA composite were studied. The results show that the molten AZ91 alloy completely infiltrated the preform without destroying the porous structure of the HA preform. The compressive strength of AZ91/HA composite increased significantly compared with that of the porous HA. The immersion test indicated that AZ91 alloy shows a lower corrosion resistance and is easier to be corroded in comparison with HA.

Key words: Biodegradable, Magnesium alloy, Porous HA, Composite, Squeeze casting

. [J]. 材料科学与技术, 2016, 32(9): 858-864.

Chen Bin,Yin Kai-Yang,Lu Tian-Feng,Sun Bing-Yi,Dong Qing,Zheng Jing-Xu,Lu Chen,Li Zhan-Chun. AZ91 Magnesium Alloy/Porous Hydroxyapatite Composite for Potential Application in Bone Repair[J]. J. Mater. Sci. Technol., 2016, 32(9): 858-864.

图/表 9

Fig. 1. Schematic diagram of the squeeze casting process: (a) HA preform setting (preheated to 480?°C), (b) molten AZ91 pouring at 720?°C, (c) low-pressure during filtration (4-5?MPa) for 5?s and high-pressure after infiltration for 30?s, and (d) release the pressure and extraction of the ingot.

Fig. 2. Appearance of porous HA preform and AZ91/HA composite.

Fig. 3. Typical SEM micrographs of (a) porous HA perform and (b) AZ91/HA composite.

Fig. 4. SEM micrographs of (a) AZ91/HA composite, and the typical EDS spectra obtained from (b) matrix, (c) eutectic phase, and (d) porous HA.

Fig. 5. Compressive curves of the porous HA, AZ91, and AZ91/HA composite.

Fig. 6. SEM micrographs of the compressive fracture surfaces of Mg/HA composite.

Fig. 7. SEM images showing surface morphologies of the experimental samples before immersion (a) and after immersion in the SBF at 37?°C for 60?h (b), 130?h (c), and (d) 470?h.

Fig. 8. Weight evaluation of the sample after immersion in the SBF for different time periods.

Fig. 9. Schematic diagram of the ideal function process of the Mg alloy/porous HA composite in body environments at the initial (a), middle (b) and final (c) stage.

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AZ91 Magnesium Alloy/Porous Hydroxyapatite Composite for Potential Application in Bone Repair

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