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HAp /Ti2Ni coatings of high bonding strength on Ti-6Al-4V prepared by the eutectic melting bonding method

Significance Statement

This paper titled “HAp /Ti2Ni coatings of high bonding strength on Ti-6Al-4V prepared by the eutectic melting bonding method” used the eutectic melting bonding (EMB) method firstly to coat titanium with a composite HAp/Ti2Ni coating. A relative low preparation temperature (1050 °C) caused little thermal expansion mismatch between HAp /Ti2Ni coatings and Ti-6Al-4V substrate. The HAp /Ti2Ni coatings were verified to mainly be an appropriate degree of crystallinity hydroxyapatite which suggested a suitable degradation velocity in vivo. This novel method got a relatively high bonding strength between coatings and substrate (69.68±5.15 MPa).

 

HAp Ti2Ni coatings of high bonding strength on Ti-6Al-4V prepared by the eutectic melting bonding method-	. Global Medical Discovery

 

 

 

 

 

 

 

 

Figure Legend

Schematic illustrations of the preparation of HAp/Ti2Ni coatings. Ni-foil was put in the indent of the Ti-6Al-4V substrate, and then a pressure of 4 MPa was applied to the Ni-foil and the substrate at 900 °C to bond them together (Stage I). Then, HAp powder was evenly spread onto the surface of the bonded Ni-foil and heated up to 1,050 °C and the temperature was maintained for 30 min to obtain the final coating (Stage II).

Journal Reference

Ye YJ, Wang PY, Li YP, Yin DC. J Mater Sci Mater Med. 2015;26(2):81.

1Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an, 710072, China.

Abstract

Eutectic melting bonding (EMB) method is a useful technique for fabricating bioactive coatings with relatively high crystallinity and bonding strength with substrate on titanium substrates. Using the EMB method, hydroxyapatite/Ti2Ni coatings were prepared on the surface of Ti-6Al-4V at a relatively low temperature (1,050 °C) in a vacuum furnace. The coatings were then characterized in terms of phase components, microstructure, bonding strength and cytotoxicity. The results showed that the coatings were mainly composed of HAp and Ti2Ni, and the thickness of the coatings was approximately 300 μm.  X-ray diffraction analysis showed that the coatings exhibited relatively high crystallinity. The tensile bonding strength between the coatings and the substrates was 69.68±5.15 MPa. The coatings had a porous and rough surface which is suitable for cell attachment and filopodia growth. The cell culture study showed that the number of MG-63 cells increased, and the cell morphology changed with the incubation time. This study showed that the EMB method can be utilized as a potentially powerful method to obtain high quality hydroxyapatite coatings with desired mechanical and biocompatibility properties on Ti-alloy substrates.

Go To Journal of Materials Science: Materials in Medicine

 

 

 

 

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