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Enhancing the wettability and interface bonding in carbon nanotubes reinforced 2A70 alloy by the coating of ZrO2
Diamond and Related Materials ( IF 4.3 ) Pub Date : 2022-08-21 , DOI: 10.1016/j.diamond.2022.109314
Yushun Lei , Qianwen Ran , Pengxiang Zhang , Hong Yan

Novel CNTs modified with ZrO2 nanoparticles (ZrO2@CNTs) were selected as the reinforcement to prepare ZrO2@CNTs/2A70 via high-intensity ultrasonic assisted casting. The microstructure, wettability, interfacial bonding, and mechanical properties of ZrO2@CNTs/2A70 composites were researched. After modifying ZrO2 on the surface of CNTs, the contact angle of CNTs to 2A70 melt reduced from 140.70° to 116.85°. Thermodynamic calculation indicated that the wetting processes of ZrO2 nanoparticles were spontaneous in initial stage, and then required additional energy from external environment. TEM analysis demonstrated that ZrO2 nanoparticles were uniformly distributed on the surface of CNTs, and could lock the CNTs in matrix, enhancing the interfacial bonding of CNTs-Al. The (010)ZrO2//(010)Al, (010)ZrO2//(100)Al, (010)ZrO2//(100)Al can form semi-coherent interface, indicating a good lattice space matching between ZrO2 and Al matrix. The 1.5 wt% ZrO2@CNTs/2A70 composites manifested excellent mechanical properties and the ultimate tensile strength reached 256.2 MPa, which were 21.47 % higher than that of the matrix (210.9 MPa). The improved mechanical properties may be attributed to the efficient load transfer of ZrO2@CNTs.



中文翻译:

ZrO2 涂层增强碳纳米管增强 2A70 合金的润湿性和界面结合

选择用ZrO 2纳米粒子(ZrO 2 @CNTs)改性的新型碳纳米管作为增强材料,通过高强度超声辅助铸造制备ZrO 2 @CNTs/2A70。研究了ZrO 2 @CNTs/2A70复合材料的微观结构、润湿性、界面结合和力学性能。在CNTs表面改性ZrO 2后,CNTs与2A70熔体的接触角从140.70°降低到116.85°。热力学计算表明,ZrO 2纳米粒子的润湿过程在初始阶段是自发的,随后需要来自外部环境的额外能量。TEM分析表明ZrO 2纳米颗粒均匀分布在碳纳米管表面,可以将碳纳米管锁定在基体中,增强碳纳米管与铝的界面结合。(010)ZrO 2 //(010)Al, (010)ZrO 2 //(100)Al, (010)ZrO 2 //(100)Al可以形成半相干界面,说明两者之间有良好的晶格空间匹配ZrO 2和Al基体。1.5 wt% ZrO 2 @CNTs/2A70复合材料表现出优异的力学性能,极限抗拉强度达到256.2 MPa,比基体(210.9 MPa)高21.47 %。改进的机械性能可归因于 ZrO 2 @CNTs 的有效负载转移。

更新日期:2022-08-21
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