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Zn基釬料釬焊燒結(jié)NdFeB與DP1180鋼接頭微觀組織及性能
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吉林大學(xué)材料科學(xué)與工程學(xué)院

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中國(guó)博士后科學(xué)基金


Microstructure and properties of soldering sintered NdFeB permanent magnet to DP1180 steel using Zn-based alloy
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China Postdoctoral Science Foundation

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    摘要:

    采用Zn-5Sn-2Cu-1.5Bi(ZSCB)釬料實(shí)現(xiàn)了燒結(jié)NdFeB永磁材料(NdFeB)與DP1180鋼的釬焊連接。在惰性氣氛控制的高頻感應(yīng)爐中進(jìn)行釬焊，采用OM、SEM、EDS、微區(qū)XRD和NIM-2000H磁性測(cè)試儀等手段分析了接頭界面的微觀組織結(jié)構(gòu)、NdFeB的磁性能和接頭剪切強(qiáng)度。結(jié)果表明，NdFeB與ZSCB釬料形成Nd-Fe-Zn和Fe-Zn冶金結(jié)合，F(xiàn)eZn13和Fe3Zn10相在DP1180鋼側(cè)的界面處形成。焊接溫度對(duì)NdFeB的磁性能影響較小。與傳統(tǒng)方法的粘接相比，接頭的剪切強(qiáng)度從32.50MPa提高到44.00MPa，提高了35.38%。由于NdFeB和ZSCB釬料之間的熱膨脹系數(shù)差異很大，在接近NdFeB的反應(yīng)層處產(chǎn)生較高的殘余應(yīng)力，導(dǎo)致接頭從NdFeB界面處斷裂。

    Abstract:

    In this work, sintered NdFeB permanent magnet (NdFeB) was firstly soldered with DP1180 steel using Zn-5Sn-2Cu-1.5Bi (ZSCB) solder. Soldering was performed in an inert atmosphere control high-frequency induction furnace, and then the microstructure, magnetic properties and shear strength were investigated by optical microscope, scanning electronic microscopy, energy dispersive X-ray analysis, NIM-2000H magnetic tester and mechanical testing machine. Results showed that the interface between NdFeB / ZSCB solder formed metallurgical bonding with Nd-Fe-Zn and Fe-Zn. FeZn13 and Fe3Zn10 phases formed in steel side of the joints. Besides, the soldering temperature had slight influence on the magnetic properties of NdFeB. Finally, compared with adhesive bonding in traditional method, the shear strength of the soldering joints were dramatically improved by 35.38%, from 32.50 MPa to 44.00 MPa. The shear strength was high enough to cause failure in NdFeB side of the joints. Fracture of the joints was caused by large difference thermal expansion coefficient between NdFeB and ZSCB solder as a result of high stress at the reaction layer closing to NdFeB.

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羅萃,邱小明,阮野,盧裕臻,邢飛. Zn基釬料釬焊燒結(jié)NdFeB與DP1180鋼接頭微觀組織及性能[J].稀有金屬材料與工程,2019,48(9):2779~2784.[Luo Cui, Qiu Xiaoming, Ruan Ye, Lu Yuzhen, xingfei. Microstructure and properties of soldering sintered NdFeB permanent magnet to DP1180 steel using Zn-based alloy[J]. Rare Metal Materials and Engineering,2019,48(9):2779~2784.]
DOI：10.12442/j. issn.1002-185X.20180946

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  • 收稿日期:2018-09-12
  • 最后修改日期:2018-10-22
  • 錄用日期:2018-11-05
  • 在線發(fā)布日期: 2019-10-09
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