Efficacy of graphene nanosheets on the plasma sprayed hydroxyapatite coating: Improved strength, toughness and in-vitro bioperformance with osteoblast

Yao Chen; Jia Ren; Yufeng Sun; Weiwei Liu; Xiaolong Lu; Shaokang Guan

Materials & Design (May 2021)

Efficacy of graphene nanosheets on the plasma sprayed hydroxyapatite coating: Improved strength, toughness and in-vitro bioperformance with osteoblast

Yao Chen,
Jia Ren,
Yufeng Sun,
Weiwei Liu,
Xiaolong Lu,
Shaokang Guan

Affiliations

Yao Chen: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Key Laboratory of Advanced Magnesium Alloys in Henan Province, Zhengzhou University, Zhengzhou 450002, China; Key Laboratory of Advanced Materials Processing & Mold, Ministry of Education, Zhengzhou 450002, China; School of Mechanical & Electric Engineering, Soochow University, Suzhou 215006, China; Corresponding author at: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
Jia Ren: School of Mechanical & Electric Engineering, Soochow University, Suzhou 215006, China
Yufeng Sun: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Key Laboratory of Advanced Magnesium Alloys in Henan Province, Zhengzhou University, Zhengzhou 450002, China; Key Laboratory of Advanced Materials Processing & Mold, Ministry of Education, Zhengzhou 450002, China
Weiwei Liu: School of Mechanical & Electric Engineering, Soochow University, Suzhou 215006, China
Xiaolong Lu: School of Mechanical & Electric Engineering, Soochow University, Suzhou 215006, China
Shaokang Guan: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Key Laboratory of Advanced Magnesium Alloys in Henan Province, Zhengzhou University, Zhengzhou 450002, China; Key Laboratory of Advanced Materials Processing & Mold, Ministry of Education, Zhengzhou 450002, China

Journal volume & issue: Vol. 203
p. 109585

Abstract

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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 homogeneously distributed in the GNS/HA coating with typical lamellar structure featured by GNSs acting as binder between 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 (~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 deflection. In addition, the GNS/HA coating exhibited improved biocompatible with MG-63 cell in terms of its attachment, 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.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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