张瑜,张宏强,梅寒,等.石墨烯强化铜泡沫对SiCf/SiC复合材料与高温合金钎焊接头组织性能的影响[J].精密成形工程,2025,17(3):49-57.
ZHANG Yu,ZHANG Hongqiang,MEI Han,et al.Effect of Graphene-reinforced Copper Foam on Microstructure Properties of SiCf/SiC Composites and Superalloys Brazed Joints[J].Journal of Netshape Forming Engineering,2025,17(3):49-57. |
| 石墨烯强化铜泡沫对SiCf/SiC复合材料与高温合金钎焊接头组织性能的影响 |
| Effect of Graphene-reinforced Copper Foam on Microstructure Properties of SiCf/SiC Composites and Superalloys Brazed Joints |
| 投稿时间：2025-01-19 |
| DOI：10.3969/j.issn.1674-6457.2025.03.006 |
| 中文关键词: 真空钎焊 SiCf/SiC复合材料 中间层 微观组织 力学性能 |
| 英文关键词: vacuum brazing SiCf/SiC composites interlayer microstructure mechanical properties |
| 基金项目:国防基础科研计划(JCKY2023601C018) |
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| 摘要点击次数: 58 |
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| 中文摘要: |
| 目的 通过石墨烯强化铜泡沫结合AgCuTi钎料实现SiCf/SiC复合材料与Nb521合金的可靠钎焊连接，并系统研究石墨烯强化铜泡沫对接头微观组织和力学性能的影响。方法 采用AgCuTi钎料结合石墨烯强化铜泡沫中间层的方法实现了SiCf/SiC与Nb521合金的可靠钎焊连接。通过显微组织观察、能谱分析和剪切强度测试，系统研究了石墨烯强化铜泡沫对钎焊接头的影响。结果 引入石墨烯强化铜泡沫后，焊缝中的Cu(s,s)从针状转变为块状，同时Ti2Cu均匀弥散分布在Cu(s,s)周围，形成互锁效应与复合强化效应。钎焊接头的剪切强度提升至85 MPa，块状Cu(s,s)的形成和Ti2Cu的均匀分布改善了焊缝的韧性。结论 石墨烯强化泡沫铜作为中间层有效改善了钎焊接头的微观组织，促进了块状Cu(s,s)的形成，优化了Ti2Cu的分布，从而显著提高了接头的剪切强度和热稳定性。 |
| 英文摘要: |
| The work aims to investigate the reliable brazing of SiCf/SiC composites to Nb521 alloy using a graphene-reinforced copper foam interlayer combined with AgCuTi brazing material, and to systematically evaluate the effect of graphene- reinforced copper foam on the microstructure and mechanical performance of the brazed joints. In this research, the AgCuTi brazing material, in conjunction with a graphene-reinforced copper foam interlayer, was employed to achieve robust brazed joints between SiCf/SiC composites and Nb521 alloy. The effects of the graphene-foamed copper interlayer on the brazed joints were analyzed through microstructural examination, energy-dispersive spectroscopy (EDS), and shear strength testing. The results revealed that, with the introduction of graphene-reinforced copper foam, the Cu(s,s) phase in the brazed joints transitioned from a needle-like morphology to a bulk structure, while Ti2Cu was uniformly distributed around Cu(s,s), forming an interlocking effect that provided composite strengthening. The shear strength of the brazed joints was significantly improved to 85 MPa. The formation of Cu(s,s) to bulk forms, along with the homogeneous distribution of Ti2Cu, effectively enhanced the toughness and thermal stability of the welds. In conclusion, the graphene-reinforced copper foam interlayer plays a pivotal role in optimizing the brazed joint microstructure by promoting the formation of bulk Cu(s,s) and refining the distribution of Ti2Cu. This enhancement leads to a substantial increase in both the shear strength and thermal stability of the joints. |
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