氧化锌包覆石墨烯纳米片/AZ31复合材料的力学性能与热导率  

Mechanical Properties and Thermal Conductivity of ZnO-Coated Graphene Nanoplatelets/AZ31 Composites

作　　者：安书江 刘素清[1] 侯华 魏梦雪 武建国[1] AN Shu-jiang;LIU Su-qing;HOU Hua;WEI Meng-xue;WU Jian-guo(School of Materials Science and Engineering,TaiYuan University of Science Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《铸造》2025年第3期327-334,共8页Foundry

基　　金：2024年中央引导地方科技发展资金项目(YDZJSX2024D050)。

摘　　要：采用化学包覆法合成包覆氧化锌的石墨烯纳米片(ZnO@GNPs),并加入AZ31B镁合金中制备ZnO@GNPs-AZ31镁基复合材料,测试了复合材料的力学性能和导热性能;并利用光学显微镜、X射线衍射仪、扫描电子显微镜及能谱仪、激光导热仪对复合材料的微观组织、热导率进行了表征与分析。分析结果表明,此方法能够控制ZnO包覆在GNPs表面,提高GNPs与镁基体的界面结合质量,增强了GNPs在镁合金中的分散性和润湿性,更有利于发挥应力转移强化、细晶强化等作用,提高材料的强度、伸长率和显微硬度。通过石墨烯在二维平面内的高导热性能,为热量的传递提供桥梁,复合材料0.2wt.%ZnO@GNPs-AZ31的热导率为100W/(m·K),相较于镁合金对照组提高了30.04%。ZnO-coated graphene nanoplatelets(ZnO@GNPs)were synthesized by chemical coating method,and then added to AZ31B magnesium alloy to prepare ZnO@GNPs-AZ31 magnesium-based composite materials.The mechanical and thermal conductivity properties of the composite materials were tested,and the microstructure,thermal conductivity,optical microscopy,X-ray diffraction,scanning electron microscopy,and energy dispersive spectrometry were characterized and analyzed.The analysis results showed that this method could control the ZnO coating on the surface of GNPs,improve the interface bonding quality between GNPs and the magnesium matrix,enhance the dispersion and wetting of GNPs in the magnesium alloy,and facilitate the stress transfer reinforcement,fine grain reinforcement,etc.,thereby improving the material's strength,elongation,and microhardness.The two-dimensional high thermal conductivity of graphene provided a bridge for heat transfer,and the thermal conductivity of the composite material with 0.2wt.%ZnO@GNPs-AZ31 was 100 W/(m·K),which was 30.04%higher than that of the magnesium alloy control group.

关 键 词：搅拌铸造 AZ31镁基复合材料 石墨烯纳米片 力学性能 热导率 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG115.5[金属学及工艺—金属材料]