李波,王豪,蒋超伟,等.超音速激光沉积增材制造CNTs/Cu复合材料微观结构及力学性能研究[J].精密成形工程,2023,15(11):89-99.
LI Bo,WANG Hao,JIANG Chao-wei,et al.Microstructure and Mechanical Properties of CNTs/Cu Composite Additively Manufactured by Supersonic Laser Deposition[J].Journal of Netshape Forming Engineering,2023,15(11):89-99. |
| 超音速激光沉积增材制造CNTs/Cu复合材料微观结构及力学性能研究 |
| Microstructure and Mechanical Properties of CNTs/Cu Composite Additively Manufactured by Supersonic Laser Deposition |
| 投稿时间：2023-09-25 |
| DOI：10.3969/j.issn.1674-6457.2023.011.010 |
| 中文关键词: CNTs 超音速激光沉积 CNTs/Cu涂层 微观结构 力学性能 |
| 英文关键词: CNTs supersonic laser deposition CNTs/Cu coating microstructure mechanical property |
| 基金项目:国家自然科学基金(52075495);浙江省自然科学基金(LY22E050017);国网宁夏电力有限公司科技项目(5229CG 200069) |
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| 中文摘要: |
| 目的 研究超音速激光沉积增材制造CNTs/Cu复合材料的微观结构及力学性能。方法 对CNTs进行表面镀铜处理，提高它与Cu黏接相之间的润湿性，增强CNTs/Cu之间的界面结合，利用超音速激光沉积技术(Supersonic Laser Deposition，SLD)增材制备不同CNTs含量的CNTs/Cu复合材料，对比研究了CNTs含量和退火温度对CNTs/Cu复合材料微观结构及力学性能的影响规律，并采用能谱仪对拉伸断口微区进行元素分析测定。结果 SLD制备的CNTs/Cu复合材料具有优异的塑性变形能力，而强度较高的CNTs通过嵌入铜粉颗粒之间的缝隙提升了沉积质量。对复合材料微观组织进行表征发现组织无明显孔隙、致密性良好，且无烧蚀现象。CNTs的加入有效提高了CNTs/Cu复合材料的抗拉性能，并且随着CNTs含量的上升，CNTs/Cu复合材料的极限抗拉强度(Ultimate Tensile Strength，UTS)稳步上升;当CNTs质量分数为0.3%时，CNTs/Cu复合材料的UTS为36.33 MPa，是CNTs质量分数为0.05%时的1.35倍。随着退火温度的升高，CNTs/Cu复合材料的UTS表现为先增大后减小的趋势，在500 ℃时UTS达到最大值。结论 由于激光加热软化的效果与表面镀铜的包覆作用，CNTs能够均匀地分布在CNTs/Cu复合材料内部，同时明显增强复合材料内部颗粒的界面结合强度，后续的热处理有助于使材料从不稳定的机械结合逐步转换为冶金结合，显著提高复合材料的抗拉性能。 |
| 英文摘要: |
| The work aims to study the microstructure and mechanical properties of CNTs/Cu composite additively manufactured by supersonic laser deposition. Copper coating was plated on the surface of CNTs to improve the wetting with Cu and strengthen the interface bonding between CNTs and Cu. CNTs/Cu composites with different contents of CNTs were fabricated through additive manufacturing by the Supersonic Laser Deposition (SLD). The effects of CNTs content and annealing temperature on the microstructure and mechanical properties of the CNTs/Cu composites were comparatively investigated, and elemental analysis of the fracture surface micro-zone was performed with an energy spectrometer. The CNTs/Cu composite fabricated by SLD exhibited excellent plastic deformation capability. The high-strength CNTs embedded in the gaps between copper powder particles contributed to the improvement of deposition quality. Microstructural characterization revealed no significant porosity or burnout phenomena and good densification of the composite materials. The addition of CNTs effectively enhanced the tensile properties of the CNTs/Cu composites, and the Ultimate Tensile Strength (UTS) of the CNTs/Cu composites steadily increased with the increase in CNTs content. When the CNTs content was 0.3%, the UTS of the CNTs/Cu composites was 36.33 MPa, which was 1.35 times higher than that at 0.05% CNTs content. With the increase in annealing temperature, the UTS of the CNTs/Cu composites showed an initial increase followed by a decrease, reaching a maximum at 500 ℃. In conclusion, the laser-induced softening and copper coating effect enable the homogeneous distribution of CNTs within the CNTs/Cu composites and significantly enhance the interface bonding between particles in the composites. Subsequent heat treatment facilitates the transition from unstable mechanical bonding to metallurgical bonding, leading to a significant improvement in the tensile properties of the composites. |
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