Study on Graphene Oxide/HA Composites Prepared by Gelcasting Technology
LI Qiang1, WEI Leishan1, SUN Xudong2
1 College of Materials Science & Engineering, Liaoning University of Technology, Jinzhou 121001; 2 School of Materials Science & Engineering, Northeastern University, Shenyang 110004
Abstract: Graphene oxide (GO) and hydroxyapatite(HA) particles were used as initial materials to prepare GO/HA compo-sites by gelcasting method. The effects of the contents of organic monomer and graphene oxide,the solid content of the slurries on viscosity of GO/HA slurries were studied. The gelcasting processes of the GO/HA slurries were observed and the green density and compressive strength of green compacts were measured. The effects of GO contents on bending strength and fracture toughness of GO/HA composites were analyzed. The microstructure of the fracture surface of the HA composites were observed. The results show that at organic monomer of 15wt%, GO particles of 1.5wt% and the solid content of slurries of 45wt%, the GO/HA slurries have better viscosity of 362.9 mPa·s and good dispersion. The solidified compacts have better density and compressive strength. With the increase of the contents of the GO particles, the bending strength and fracture toughness of the HA composites first increase and then decrease. When the content of GO particles is 1.5wt%, the GO/HA composites sintered at 1 150 ℃ have bending strength of 81.5 MPa and flexural toughness of 1.52 MPa·m1/2, which are 151.8% and 74.7% higher than those of HA matrix. Therefore, the GO/HA composites have better mechanical properties with the addition of GO particles.
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2017, Vol. 31 
