Pre-oxidation induced in situ interface strengthening in biodegradable Zn/nano-SiC composites prepared by selective laser melting

Chengde Gao; Meng Yao; Shuping Peng; Wei Tan; Cijun Shuai

Journal of Advanced Research (May 2022)

Pre-oxidation induced in situ interface strengthening in biodegradable Zn/nano-SiC composites prepared by selective laser melting

Chengde Gao,
Meng Yao,
Shuping Peng,
Wei Tan,
Cijun Shuai

Affiliations

Chengde Gao: State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Meng Yao: State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Shuping Peng: NHC Key Laboratory of Carcinogenesis, The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, School of Basic Medical Science, Central South University, Changsha 410078, China; School of Energy and Machinery Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China
Wei Tan: Department of Spine Surgery, The Third Xiangya Hospital of Central South University, Changsha 410013, China; Department of Spinal Orthopedics, Huizhou Third People's Hospital, Guangzhou Medical University, Huizhou 516002, China; Corresponding authors at: Department of Spine Surgery, The Third Xiangya Hospital of Central South University, Changsha 410013, China (W. Tan). State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China (C. Shuai).
Cijun Shuai: State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; Institute of Bioadditive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, China; Corresponding authors at: Department of Spine Surgery, The Third Xiangya Hospital of Central South University, Changsha 410013, China (W. Tan). State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China (C. Shuai).

Journal volume & issue: Vol. 38
pp. 143 – 155

Abstract

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Introduction: Nano-SiC has attracted great attention as ceramic reinforcement in metal matrix composites, but the weak interface bonding between them remains a bottleneck for efficient strengthening. Objective: In this study, pre-oxidation treatments and selective laser melting (SLM) were employed to prepare Zn/nano-SiC biocomposites with strengthened interface bonding via in situ reaction. Methods: Nano-SiC and Zn powders were pre-oxidized respectively, and then used to prepare Zn/nano-SiC biocomposites via SLM. The powder microstructure, and the interface characteristics and mechanical properties of the biocomposites were investigated. The degradation properties and cell response were analyzed to evaluate their feasibility for orthopedic applications. Results: The results indicated that the pre-oxidation treatments generated a uniform oxide layer on the surface of both nano-SiC and Zn particles and the thickness of the oxide layer increased with pre-oxidation temperature. During the SLM process, the oxide layers not only improved the metal-ceramic wettability by reducing interface energy, but also induced in situ reaction to form chemical bonding between the Zn matrix and nano-SiC, thereby improving the interface bonding. Consequently, the Zn biocomposite reinforced by nano-SiC with a pre-oxidation temperature of 1000 °C (ZS1000 biocomposite) exhibited more transgranular fracture and significantly enhanced compressive yield strength of 171.5 MPa, which was 31.6% higher than that of the Zn biocomposite reinforced by nano-SiC without pre-oxidation. Moreover, the ZS1000 biocomposite presented slightly accelerated degradation which might be ascribed to the facilitated electron transfer by the interface product (Zn2SiO4). In addition, the ZS1000 biocomposite also showed appropriate biocompatibility for MG-63 cell adhesion, growth, and proliferation. Conclusion: This study shows the potential practical applicability for the preparation of Zn-based biocomposites with strong interface bonding and mechanical properties for orthopedic applications.

Published in Journal of Advanced Research

ISSN: 2090-1232 (Print); 2090-1224 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Medicine: Medicine (General); Science: Science (General)
Website: http://www.journals.elsevier.com/journal-of-advanced-research/

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