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石墨烯增强锌基可生物降解复合材料的微观结构与力学性能

Microstructure and Mechanical Properties of Zinc Matrix Biodegradable Composites Reinforced by Graphene.

作者信息

Dai Qianfei, Peng Shanshan, Zhang Zongkui, Liu Yuan, Fan Mei, Zhao Fei

机构信息

College of Materials and Metallurgy, Guizhou University, Guiyang, China.

Key Laboratory for Materials Structure and Strength of Guizhou Province, Guiyang, China.

出版信息

Front Bioeng Biotechnol. 2021 Mar 31;9:635338. doi: 10.3389/fbioe.2021.635338. eCollection 2021.

DOI:10.3389/fbioe.2021.635338
PMID:33968911
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8103547/
Abstract

This work used spark plasma sintering (SPS) to prepare graphene nanosheets (GNS) reinforced zinc matrix composites. The influence of GNS on the microstructure and mechanical properties of zinc matrix composites was studied. The results show that the GNS/Zn composites prepared by SPS have a dense structure and good interface bonding, and GNS are uniformly distributed in the zinc matrix. Adding GNS can significantly improve the mechanical properties of the zinc matrix. When 0.7 wt% GNS are added, the comprehensive mechanical properties of the composite material are improved. The ultimate tensile strength is 254 MPa, and the Vickers hardness is 65 HV, which are 126 and 20.3% higher than those of pure zinc (112 MPa and 54 HV), respectively. The strengthening mechanisms of GNS/Zn composites are mainly load transfer of GNS and dislocation strengthening caused by coefficient of thermal expansion (CTE) mismatch. In addition, the biodegradability of GNS/Zn composites was evaluated by electrochemical measurement and immersion test. The results show that adding GNS to the zinc matrix will accelerate the degradation rate of the composite material. But the degradation rate can be controlled by the content of GNS. Its degradation rate is in the range of 69-301 μm/a, an ideal degradation rate as an orthopedic implant material.

摘要

本研究采用放电等离子烧结（SPS）法制备了石墨烯纳米片（GNS）增强锌基复合材料。研究了GNS对锌基复合材料微观结构和力学性能的影响。结果表明，通过SPS制备的GNS/Zn复合材料结构致密，界面结合良好，且GNS均匀分布于锌基体中。添加GNS可显著提高锌基体的力学性能。当添加0.7 wt%的GNS时，复合材料的综合力学性能得到改善。其极限抗拉强度为254 MPa，维氏硬度为65 HV，分别比纯锌（112 MPa和54 HV）高出126%和20.3%。GNS/Zn复合材料的强化机制主要为GNS的载荷传递以及热膨胀系数（CTE）失配引起的位错强化。此外，通过电化学测量和浸泡试验对GNS/Zn复合材料的生物降解性进行了评估。结果表明，向锌基体中添加GNS会加速复合材料的降解速率。但其降解速率可通过GNS的含量进行控制。其降解速率在69 - 301 μm/a范围内，作为骨科植入材料具有理想的降解速率。

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