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| 不同放电能量下铜粉的电磁压实特性与烧结体性能研究 |
| Study on Electromagnetic Compaction Characteristics and Sintered Body Properties of Copper Powder under Different Discharge Energies |
| Received:April 21, 2021 |
| DOI：10.3969/j.issn.1674-6457.2021.04.005 |
| 中文关键词: 电磁压实 铜粉 烧结体 微观形貌 拉伸强度 |
| 英文关键词: electromagnetic compaction copper powder sintered body micro-morphology tensile strength |
| 基金项目:国家自然科学基金(51975202);湖南省自然科学基金(2019JJ30005) |
| Author Name | Affiliation | | DONG Dong-ying | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | WANG Chong-wu | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | JIANG Hao | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | LI Guang-yao | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | CUI Jun-jia | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China |
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| 中文摘要: |
| 目的 研究放电能量对铜粉电磁压实特性与烧结体性能的影响，提升铜材料的制备效率与质量。方法 通过电磁粉末压实技术在不同放电能量下制备铜压坯，研究压坯的相对致密度与微观形貌随放电能量的变化趋势。随后对其进行真空烧结，对烧结体的拉伸性能与断口形貌进行测试，评估放电能量对烧结体性能的影响。结果 随着放电能量的增加，铜压坯的相对致密度逐渐增大并趋于平稳。在20 kJ时，压坯的相对致密度较好，为0.968。压坯端面的孔隙随放电能量的增大逐渐减少，上端面的压实质量总体好于下端面。压坯烧结后拉伸载荷与位移随放电能量的增大逐渐增大，在20 kJ时试样的拉伸强度与断裂伸长率均达到了最大，分别为224.7 MPa和29.2%。拉伸试样的微观断口显示，断口表面的孔隙逐渐减小，颗粒边界熔合效果逐渐提升，韧窝越发明显。结论 试验结果表明，电磁粉末压实技术制备的铜材料在20 kJ的放电能量时具有较好的压实与烧结性能，为铜粉电磁压实工艺参数的设计提供了参考。 |
| 英文摘要: |
| This paper aims to study the influence of discharge energy on the electromagnetic compaction characteristics and sintered body properties of copper powder, and to improve the preparation efficiency and quality of copper materials. In this work, copper compacts were prepared by electromagnetic powder compaction technology under different discharge energies. The change trend of the relative density and micro-morphology of compacts with the discharge energy was studied. Then, the compacts were vacuum sintered, and the tensile properties and fracture morphology were tested to evaluate the effect of discharge energy on the performance of the sintered body. Results showed that the relative density of the copper compacts gradually increased and tended to stabilize as the discharge energy increased. At 20 kJ, the relative density of the compacts reached the maximum, which was 0.968. The pores of the end face of compacts gradually decreased with the increase of discharge energy, and the compaction quality of the upper end face was generally better than that of the lower end face. After the compacts were sintered, the tensile load and displacement gradually increased with the increase of discharge energy. The tensile strength and elongation at break of the specimen both reached the maximum at 20 kJ, which were 224.7 MPa and 29.2%, respectively. The microscopic fracture of the tensile specimens showed that the pores on the fracture surface were gradually reduced, the effect of particle boundary fusion was gradually improved, and the dimples became more obvious. In conclusion, the test results showed that the copper materials prepared by electromagnetic powder compaction technology had better compaction and sintering performance at a discharge energy of 20 kJ, which can be a reference for the establishment of the electromagnetic compaction process parameters of copper powder. |
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