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Al2O3陶瓷與TiAl合金真空釬焊接頭界面組織及性能
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天津大學 天津市現(xiàn)代連接技術重點實驗室,天津大學 天津市現(xiàn)代連接技術重點實驗室,天津大學 天津市現(xiàn)代連接技術重點實驗室,天津大學 天津市現(xiàn)代連接技術重點實驗室

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TG454

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國家自然科學基金青年基金資助項目(51405332)


Interfacial Structure and Properties of Al2O3 Ceramic and TiAl Alloy Brazed Joints
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Tianjin Key Lab of Advanced Joining Technology,Tianjin University,Tianjin Key Lab of Advanced Joining Technology,Tianjin University,Tianjin Key Lab of Advanced Joining Technology,Tianjin University,Tianjin Key Lab of Advanced Joining Technology,Tianjin University

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    摘要:

    采用AgCuTi活性釬料實現(xiàn)了Al2O3陶瓷與TiAl合金的釬焊連接,研究了釬焊接頭的界面結(jié)構(gòu)及其形成機制,并且分析了不同釬焊參數(shù)對接頭界面組織和接頭力學性能的影響規(guī)律。結(jié)果表明：Al2O3陶瓷與TiAl合金釬焊接頭的典型界面組織為：Al2O3/Ti3(Cu,Al)3O/Ag(s.s)+Cu(s.s)+AlCu2Ti/AlCu2Ti+AlCuTi/TiAl。釬焊過程中,TiAl基體向液態(tài)釬料中的溶解量決定了釬焊接頭界面組織的形成及其演化。隨著釬焊溫度的升高和保溫時間的延長,Al2O3陶瓷側(cè)的Ti3(Cu,Al)3O反應層增厚,釬縫中彌散分布的團塊狀AlCu2Ti化合物逐漸聚集長大。陶瓷側(cè)界面反應層的厚度和釬縫中AlCu2Ti化合物的形態(tài)及分布共同決定著接頭的抗剪強度。當釬焊溫度為880 ℃,保溫10 min時,接頭的抗剪強度最大,達到94 MPa,此時接頭的斷裂形式呈現(xiàn)沿Al2O3陶瓷基體和界面反應層的復合斷裂模式。

    Abstract:

    Al2O3 ceramic and TiAl alloy were brazed with AgCuTi filler and the interfacial structure with the change of brazing parameters as well as the forming mechanism of the joint were studied. Results show that the typical interfacial microstructure of the brazed joints was: Al2O3/Ti3(Cu,Al)3O/Ag(s.s)+Cu(s.s)+AlCu2Ti/AlCuTi/TiAl. During the brazing, Ti and Al would dissolve from the TiAl substrate and make a major impact on the microstructure and mechanical properties of the brazed joints. With the increase of brazing temperature and time, the thickness of Ti3(Cu,Al)3O reaction layer increased and the blocky AlCu2Ti compounds aggregated and grew up gradually, which influced collectively the mechanical properties of the jont. The average shear strength reached a maximum of 94 MPa with the joint brazed with 880 ℃/10 min. The crack primarily propagated at Al2O3 substrate and partially along the reaction layer.

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牛國賓,王東坡,楊振文,王穎. Al2O3陶瓷與TiAl合金真空釬焊接頭界面組織及性能[J].稀有金屬材料與工程,2017,46(11):3282~3287.[Niu Guobin, Wang Dongpo, Yang Zhenwen, Wang Ying. Interfacial Structure and Properties of Al2O3 Ceramic and TiAl Alloy Brazed Joints[J]. Rare Metal Materials and Engineering,2017,46(11):3282~3287.]
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  • 收稿日期:2015-08-18
  • 最后修改日期:2015-10-08
  • 錄用日期:2015-11-18
  • 在線發(fā)布日期: 2017-12-13
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