3N4-MoSi2復合陶瓷;高溫活性釬料;高溫抗剪強度"/> 3N4-MoSi2復合陶瓷和金屬Nb進行真空釬焊試驗,研究了其典型界面組織組成及形成機理,分析了釬焊溫度和保溫時間對釬焊接頭界面組織及力學性能的影響規(guī)律。結果表明,接頭典型界面結構為Nb/β-Ti/(Ti. Zr)2(Cu, Ni)+β-Ti+(Ti, Zr)5Si3/TiN+(Ti, Zr)5Si3+MoSi2/Si3N4-MoSi2。釬焊溫度和保溫時間主要通過控制Si3N4-MoSi2復合陶瓷母材中Si原子向釬料中擴散程度,來影響釬縫中(Ti, Zr)5Si3化合物的數(shù)量及分布,進而影響釬焊接頭的抗剪強度。在920 ℃/10 min的工藝參數(shù)下,Si3N4-MoSi2/Nb接頭的室溫抗剪強度最高達到112 MPa,選擇最優(yōu)參數(shù)條件下的Nb/Si3N4-MoSi2釬焊接頭在500 ℃和600 ℃條件下進行高溫剪切實驗,其高溫抗剪強度分別達到123 MPa和131 MPa。"/>

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TiZrNiCu釬焊Si3N4-MoSi2復合陶瓷與Nb接頭組織與力學性能
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天津大學 天津市現(xiàn)代連接重點實驗室

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國家自然科學基金資助(項目號：51774214)


Microstructure and Mechanical Properties of Si3N4-MoSi2 composite Ceramic and Nb Joints Brazed with TiZrNiCu
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Tianjin Key Lab of Advanced Joining Technology,Tianjin University

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    摘要:

    采用高溫活性釬料TiZrNiCu對Si3N4-MoSi2復合陶瓷和金屬Nb進行真空釬焊試驗,研究了其典型界面組織組成及形成機理,分析了釬焊溫度和保溫時間對釬焊接頭界面組織及力學性能的影響規(guī)律。結果表明,接頭典型界面結構為Nb/β-Ti/(Ti. Zr)2(Cu, Ni)+β-Ti+(Ti, Zr)5Si3/TiN+(Ti, Zr)5Si3+MoSi2/Si3N4-MoSi2。釬焊溫度和保溫時間主要通過控制Si3N4-MoSi2復合陶瓷母材中Si原子向釬料中擴散程度,來影響釬縫中(Ti, Zr)5Si3化合物的數(shù)量及分布,進而影響釬焊接頭的抗剪強度。在920 ℃/10 min的工藝參數(shù)下,Si3N4-MoSi2/Nb接頭的室溫抗剪強度最高達到112 MPa,選擇最優(yōu)參數(shù)條件下的Nb/Si3N4-MoSi2釬焊接頭在500 ℃和600 ℃條件下進行高溫剪切實驗,其高溫抗剪強度分別達到123 MPa和131 MPa。

    Abstract:

    The vacuum brazing experiment of Si3N4-MoSi2 composite ceramic and Nb was successfully carried out with high-temperature active brazing filler TiZrNiCu. The typical interface structure and formation mechanism of the brazing joint were studied, and the effects of brazing temperature and holding time on interface structure and mechanical properties of brazed joints were analyzed. The results show that the typical interface structure of the joint was Nb/β-Ti/(Ti, Zr)2(Cu, Ni)+β-Ti+(Ti, Zr)5Si3/TiN+(Ti, Zr)5Si3+MoSi2/Si3N4-MoSi2. Brazing temperature and holding time affected the amount and distribution of (Ti, Zr)5si3 compound in the brazing seam by controlling the diffusion degree of Si atoms in Si3N4-MoSi2 composite ceramic to the brazing filler, thus affecting the shear strength of the brazed joint. The highest room temperature shear strength of Nb/Si3N4-MoSi2 joint was 112 MPa at 920 ℃/10 min. The high-temperature shear strength of Nb/Si3N4-MoSi2 brazed joint was 123 MPa and 131 MPa at 500 ℃ and 600 ℃, respectively.

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單文禹,王穎,楊振文,王東坡. TiZrNiCu釬焊Si3N4-MoSi2復合陶瓷與Nb接頭組織與力學性能[J].稀有金屬材料與工程,2022,51(3):927~933.[Shan Wenyu, Wang Ying, Yang zhenwen, Wang dongpo. Microstructure and Mechanical Properties of Si3N4-MoSi2 composite Ceramic and Nb Joints Brazed with TiZrNiCu[J]. Rare Metal Materials and Engineering,2022,51(3):927~933.]
DOI：10.12442/j. issn.1002-185X.20210225

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  • 收稿日期:2021-03-17
  • 最后修改日期:2021-04-07
  • 錄用日期:2021-04-16
  • 在線發(fā)布日期: 2022-04-06
  • 出版日期: 2022-03-30