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C/C復(fù)合材料與Invar合金釬焊接頭組織性能研究
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合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院

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安徽省自然科學(xué)基金


Microstructure and mechanical properties of C/C composite/Invar alloy joints brazed with Cu-Sn-Ti alloy
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Anhui Provincial Natural Science Foundation

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    摘要:

    C/C復(fù)合材料是一種重要的航空航天和核結(jié)構(gòu)材料，實(shí)現(xiàn)其與金屬材料的連接可以克服其成本高和成型加工困難的問(wèn)題。本文采用Cu-Sn-Ti活性釬料釬焊C/C復(fù)合材料與Invar合金，研究了釬焊溫度和保溫時(shí)間對(duì)接頭組織、剪切強(qiáng)度和斷裂行為的影響。結(jié)果表明，在C/C復(fù)合材料一側(cè)，Cu-Sn-Ti與C/C形成TiC反應(yīng)層并實(shí)現(xiàn)連接，同時(shí)Cu-Sn-Ti會(huì)滲透進(jìn)C/C復(fù)合材料中，形成凹凸不平的釘扎界面并強(qiáng)化接頭；在Invar合金一側(cè)，Cu-Sn-Ti與其相互溶解擴(kuò)散并發(fā)生反應(yīng)，形成良好界面結(jié)合；釬焊接頭組織結(jié)構(gòu)為Invar合金/Cu(s,s)+Fe2Ti+Ni3Ti+Ti6Sn5/Fe2Ti+CuTi+Cu3Sn/TiC+Cu(s,s)/C/C復(fù)合材料。在釬焊溫度為930 ℃保溫10 min時(shí)，接頭剪切強(qiáng)度最高，為61 MPa，明顯高于目前報(bào)道的C/C復(fù)合材料與金屬的釬焊連接強(qiáng)度。

    Abstract:

    C/C composites are the important structure materials for aerospace and nuclear applications. Realizing the joining of C/C composite to metal materials can overcome the drawbacks of high cost and hard-to-forming difficulties of C/C composite. In this paper, C/C composite and Invar alloy were brazed with active Cu-Sn-Ti filler alloy. The effects of brazing temperature and holding time on the microstructure, shear strength and fracture behavior of brazed joints were investigated. The results showed that, on the side of C/C composite, Cu-Sn-Ti filler reacted with C/C composite to form a TiC reaction layer. In addition, Cu-Sn-Ti filler would penetrate into the C/C composite, which formed a zigzag interface that strengthened the joint. On the side of Invar alloy, Invar alloy dissolved into Cu-Sn-Ti form a good interface metallurgical bonding. The interfacial microstructure of brazed joint was determined to be Invar alloy/Cu(s,s)+Fe2Ti+Ni3Ti+Ti6Sn5/Fe2Ti+CuTi+Cu3Sn/TiC+Cu(s,s)/C/C composite. The maximum shear strength of the joint of 61 MPa, which is significantly higher than the strength reported in previous studies, was obtained at brazing temperature of 930 ℃ and the holding time was 10 min.

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潘蘇燕,鐘志宏,宋奎晶,梁水保,吳玉程. C/C復(fù)合材料與Invar合金釬焊接頭組織性能研究[J].稀有金屬材料與工程,2024,53(8):2232~2240.[Pan Suyan, ZHONG ZHIHONG, Song Kuijing, Liang Shuibao, Wu Yucheng. Microstructure and mechanical properties of C/C composite/Invar alloy joints brazed with Cu-Sn-Ti alloy[J]. Rare Metal Materials and Engineering,2024,53(8):2232~2240.]
DOI：10.12442/j. issn.1002-185X.20230387

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  • 收稿日期:2023-06-18
  • 最后修改日期:2023-07-30
  • 錄用日期:2023-08-24
  • 在線發(fā)布日期: 2024-08-20
  • 出版日期: 2024-08-08