期刊
MATERIALS & DESIGN
卷 203, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2021.109585
关键词
Ceramic-matrix composites; Plasma spray; Mechanical properties; Graphene nanosheet; Hydroxyapatite; In-vitro biocompatibility
资金
- National Natural Science Foundation of China [51471113, 51275326]
A graphene nanosheet (GNS) reinforced HA coating was developed using plasma spray for biomedical applications. The coating showed improved strength, toughness, and enhanced biocompatibility, making it a promising candidate for bone regeneration and implantation.
Graphene nanosheet (GNS) reinforced HA coating on Ti6Al4V substrate, fabricated using plasma spray, was developed for biomedical applications. Microstructural observation corroborated that the adding GNSs homoge-neously distributed in the GNS/HA coating with typical lamellar structure featured by GNSs acting as binder be-tween the discrete HA splats. Meanwhile, GNSs were observed to get in direct contact with HA matrix and form a clean GNS-HA interface without interfacial product. Results of various indentation tests showed simultaneous improvement in both indentation yield strength (similar to 379 MPa) and fracture toughness (0.78 +/- 0.17 MPam1/2), mainly attributing to synergetic toughening and strengthening mechanisms associated with the adding GNSs such as load transfer, GNS pull-out, inter-layer sliding of a GNS, crack branching, GNS bridging and crack deflec-tion. In addition, the GNS/HA coating exhibited improved biocompatible with MG-63 cell in terms of its attach-ment, adhesion strength, proliferation and differentiation. Hence, the GNS/HA composite coating with improved strength, toughness and enhanced biocompatibility makes it a promising candidate for bone regeneration and implantation. (C) 2021 The Authors. Published by Elsevier Ltd.
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