Synthesis of Graphene/Hydroxyapatite Composite Bioceramics via Plasma Activated Sintering

doi:10.15541/jim20180142

Abstract

Abstract:

Graphene/hydroxyapatite (rGO/HAp) composite bioceramics were fabricated by plasma activated sintering using hydroxyapatite (HAp) as matrix and graphene (rGO) as reinforced phase. The effects of rGO addition on phase structure, bioactivity and fracture toughness of HAp ceramics matrix were systematically investigated. The results indicate that the incorporation of rGO is beneficial to promoting the bioactivity of HAp ceramics. Meanwhile, hardness and fracture toughness of composite bioceramics initially increase and then decrease significantly with rGO concentration increasing. The hardness and fracture toughness of the specimen with rGO loading of 2wt% reach 6.97 GPa and 0.84 MPa•m^1/2, which display ~11.5% and ~37.3% improvements as compared to pure HAp ceramics, respectively. It is demonstrated that the pull-out effect of rGO is the major reason for enhancing the mechanical properties of composite ceramics.

Key words: hydroxapatite, graphene, plasma activated sintering, bioactivity, fracture toughness

CLC Number:

TB321

ZHANG Biao, YANG Chang-An, SHI Pei. Synthesis of Graphene/Hydroxyapatite Composite Bioceramics via Plasma Activated Sintering[J]. Journal of Inorganic Materials, 2018, 33(12): 1355-1359.

Figures/Tables 7

Fig. 1 Optical photos (insets) and SEM images of fracture surface of rGO/HAp composite bioceramics(a) Pure HAp; (b) 1wt% rGO/HAp; (c) 2wt% rGO/HAp; (d) 5wt% rGO/Hap

Fig. 2 XRD patterns of rGO/HAp composite bioceramics

Fig. 3 Raman spectra of rGO/HAp composite bioceramics

Fig. 4 SEM images and EDS spectra of fracture surface of 2wt% rGO/HAp composite bioceramics(a) SEM images; (b) EDS spectra; Elemental mappings of (c) Ca, (d) P, and (e) C elements

Fig. 5 LSCM images of mineralization products on the surface of rGO/HAp composite bioceramics(a) Pure HAp; (b) 1wt% rGO/HAp; (c) 2wt% rGO/HAp; (d) 5wt% rGO/HAp

Fig. 6 SEM images of deposition on the surface of 2wt% rGO/HAp composite bioceramics(a) Morphology of the surface sediment after mineralization; (b) Partial enlarged drawing

Fig. 7 Vickers hardness and fracture toughness of rGO/HAp composite bioceramics

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