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XIN Chenglai, LI Ning, YAN Jiazhen. Investigation of brazing joints of Al2O3 ceramics to Kovar alloys by Ti+Nb/Mo metallization[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(9): 45-48. DOI: 10.12073/j.hjxb.2018390222
Citation: XIN Chenglai, LI Ning, YAN Jiazhen. Investigation of brazing joints of Al2O3 ceramics to Kovar alloys by Ti+Nb/Mo metallization[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(9): 45-48. DOI: 10.12073/j.hjxb.2018390222

Investigation of brazing joints of Al2O3 ceramics to Kovar alloys by Ti+Nb/Mo metallization

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  • Received Date: February 24, 2017
  • Ti+Nb/Mo thin films were deposited onto Al2O3 ceramic by magnetron sputtering with a subsequent nickel-plating to ensure the robust brazing of Al2O3 ceramic to Kovar alloy using the filler of AgCu28. Microstructures of the metallization layer and the brazing joints of Al2O3/Kovar were investigated systematically by scanning electron microscopy (SEM) and energy dispersive X-ray (EDS). The results show that the interfacial reaction layers are created between filler alloys and base materials. Interdiffusion of Ni and Cu at the interface of AgCu/Kovar resulted in the formation of the reaction layer. The metallization layer plays an important role in hindering the formation of intermetallic compounds and relieving residual thermal stress at Al2O3/AgCu interface. In addition, the presence of eutectic region arising from nickel-plating can improve the thickness of the brazing seam and therefore a good bonding betweenAl2O3 ceramic and Kovar was achieved.
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