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. 2020 Sep 7;13(18):3948.
doi: 10.3390/ma13183948.

Fabrication and Microstructure of ZnO/HA Composite with In Situ Formation of Second-Phase ZnO

Shidan Yuan  1 , Ye Ma  1 , Xingyi Li  1 , Zhen Ma  1 , Hui Yang  1 , Liting Mu  1   2
Affiliations

Fabrication and Microstructure of ZnO/HA Composite with In Situ Formation of Second-Phase ZnO

Shidan Yuan et al. Materials (Basel). .

Abstract

Nanometer hydroxyapatite (n-HA) powders were synthesized by the chemical precipitation method, and a novel ZnO/HA composite, which consisted of second-phase particles with different sizes and distributions, was successfully fabricated. ZnO/HA composites were prepared by using powder sintering with different Zn contents and a prefabrication pressure of 150 MPa. Microstructure and local chemical composition were analyzed by a scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS), respectively. The phase composition and distribution of the composite were determined with electron back-scattered diffraction (EBSD) and an X-ray diffractometer (XRD), respectively. The experimental results of the XRD showed that the chemical precipitation method was a simple and efficient method to obtain high-purity n-HA powders. When the sintering temperature was lower than 1250 °C, the thermal stability of HA was not affected by the Zn in the sintering process. Due to sintering in an air atmosphere, the oxidation reaction of Zn took place in three stages, and ZnO as the second phase had two different sizes and distributions in the composites. The compressive strength of ZnO/HA composites, of which the highest was up to 332 MPa when the Zn content was 20%, was significantly improved compared with pure HA. The improvement in mechanical properties was mainly due to the distribution of fine ZnO particles among HA grains, which hindered the HA grain boundary migration and refinement of HA grains. As grain refinement increased the area of the grain boundary inside the material, both the grain boundary and second phase hindered crack development in different ways.

Keywords: ZnO/HA composite; compression strength; grain growth; powder sintering.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Preparation process of (a) nanometer hydroxyapatite (n-HA) powders and (b) ZnO/HA composites.
Figure 2
Figure 2
(a,b) SEM morphology; (c) EDX spectrum, and (d) XRD pattern of n-HA powders.
Figure 3
Figure 3
XRD patterns of the ZnO/HA composites.
Figure 4
Figure 4
(a) SEM morphology; (b-1) phase distribution; and (b-2) inverse pole figures of pure HA sintered at 1250 °C.
Figure 5
Figure 5
(a) SEM morphology; (b-1) phase distribution; and (b-2) inverse pole figures of ZnO/HA composite sample with 10% Zn addition sintered at 1250 °C.
Figure 6
Figure 6
Grain size of HA and orientation distribution ofpure HA and ZnO/HA composites: (a,e) Pure HA; (b,f) Zn 10 wt.%; (c,g) Zn 20 wt.%; (d,h) Zn 30 wt.%.
Figure 7
Figure 7
The compression strength of pure HA and ZnO/HA composites.
Figure 8
Figure 8
Grain size variation curve of pure HA prepared with different sintering temperatures for 2 h.
Figure 9
Figure 9
(a) SEM morphology and (b) EDS elemental map of Zn element distribution map of ZnO/HA composite sample with 20% Zn addition sintered at 1250 °C for 2 h.
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References

    1. Pramanik S., Agarwal A.K., Rai K., Garg A. Development of high strength hydroxyapatite by solid-state-sintering process. Ceram. Int. 2007;33:419–426. doi: 10.1016/j.ceramint.2005.10.025. - DOI
    1. Tseng Y.H., Kuo C.S., Li Y.Y., Huang C.P. Polymer-assisted synthesis of hydroxyapatite nanoparticle. Mater. Sci. Eng. C. 2009;29:819–822. doi: 10.1016/j.msec.2008.07.028. - DOI
    1. Catros S., Guillemot F., Lebraud E., Chanseau C., Perez S., Bareille R., Amédée J., Fricain J.C. Physico-chemical and biological properties of an nano-hydroxyapatite powder synthesized at room temperature. Innov. Res. Biomed. Eng. 2010;31:226–233. doi: 10.1016/j.irbm.2010.04.002. - DOI
    1. Zhang G., Chen J., Yang S., Yu Q. Preparation of amino-acid-regulated hydroxyapatite particles by hydrothermal method. Mater Lett. 2011;65:572–574. doi: 10.1016/j.matlet.2010.10.078. - DOI
    1. Ma H.B., Su W.X., Tai Z.X., Sun D.F. Preparation and cytocompatibility of polylactic acid/hydroxyapatite/graphene oxide nanocomposite fibrous membrane. Chin. Sci. Bull. 2012;57:3051–3058. doi: 10.1007/s11434-012-5336-3. - DOI