Improving the Bonding Strength of Nb–C/C Composite Brazed Structures by Preoxidation,Advanced Engineering Materials

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Improving the Bonding Strength of Nb–C/C Composite Brazed Structures by Preoxidation
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-22 , DOI: 10.1002/adem.202000065
Shiyu Niu ₁ , Zhenwen Yang _{1,

2} , Chunlei Wang ₁ , Ying Han ₁ , Ying Wang _{1,

2} , Dongpo Wang ₁

Affiliation

Preoxidation treatment is used to modify the surface of C/C composite. An annular column gap is formed encasing the carbon fiber, which promotes the infiltration of C/C composite by liquid brazing alloy during brazing. Based on the optimized preoxidation condition of 800 °C/5 min, the effects of brazing temperature (860–940 °C) and holding time (5–20 min) on the microstructure and mechanical properties of Nb and C/C joints brazed with an AgCuTi alloy are systematically investigated. The shear strength of the brazed structure at 880 °C for 10 min reaches a maximum of 57 MPa, which is increased by 28 MPa compared with that of the structure without preoxidation. The infiltration depth, reaction layer thickness, Ti–Cu compound amount, and brazing seam width are characterized to reveal the synergistic effect of preoxidation and brazing parameters on the bonding strength of structures. The selection of an appropriate brazing parameter is conducive to maximizing the positive effects of preoxidation.

中文翻译：

通过预氧化提高Nb–C / C复合钎焊结构的结合强度

预氧化处理用于修饰C / C复合材料的表面。形成包围碳纤维的环形柱间隙，其在钎焊期间促进液态钎焊合金对C / C复合材料的渗透。基于最佳的800°C / 5 min的预氧化条件，钎焊温度（860–940°C）和保持时间（5–20 min）对Nb和C / C钎焊的Nb和C / C接头的组织和力学性能的影响对AgCuTi合金进行了系统的研究。钎焊结构在880°C下持续10分钟的剪切强度最大为57 MPa，与没有预氧化的结构相比，剪切强度增加了28 MPa。渗透深度，反应层厚度，Ti-Cu化合物含量，通过表征焊缝宽度和钎焊宽度，揭示了预氧化和钎焊参数对结构结合强度的协同作用。选择合适的钎焊参数有利于最大化预氧化的积极作用。

更新日期：2020-04-22

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