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Wettability of PdNi(Co)-Cr alloys on Si3N4 ceramic and joining of Si3N4 to Si3N4

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Abstract

Eight kinds of PdNi(Co)-Cr alloys were designed, and their wettability on Si3N4 ceramic was studied with the sessile drop method. Under the vacuum heating condition of 1,523 K/30 min, Pd60-Ni40 alloy showed a contact angle of 28° on Si3N4 ceramic, and the reaction band between it and the Si3N4 consisted of the mixture of (Pd, Ni) solid solution and (Pd, Ni)-silicides. It was found that Cr addition into the Pd-Ni alloys further improved their wettability. Pd60-Co40 alloy gave a contact angle of 134°. When 8 wt.% Cr was added into Pd-Co alloy, its contact angle was remarkably decreased to 44°. The reaction products at the interfaces were examined by SEM equipped with an X-ray energy-dispersive spectrometer, and the corresponding interfacial reaction mechanism was also discussed. The formation of Pd2Si is evident at the interfaces. PdCo(Ni,Si,B)-(20∼25)Cr alloy was designed as a filler metal and was produced into filler foils by a rapidly-solidifying technique, and they were used for the brazing of Si3N4/Si3N4. The Si3N4/Si3N4 joints brazed at 1,523 K for 10 min exhibited an average three-point bend strength of 107.7 MPa at room temperature.

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Acknowledgments

This research work is sponsored by National Natural Science Foundation of China (Contract Nos. 59905022 and 50475160). We also would like to thank Aeronautical Science Foundation of China (Grant 2008ZE21005).

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Authors and Affiliations

  1. Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, 100095, Beijing, People’s Republic of China

    Hua-Ping Xiong, Bo Chen, Wan-Lin Guo & Lei Ye

Authors
  1. Hua-Ping Xiong
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  2. Bo Chen
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  3. Wan-Lin Guo
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  4. Lei Ye
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Correspondence to Hua-Ping Xiong.

Additional information

Doc. IIW-2490, recommended for publication by Commission XVII “Brazing, Soldering, and Diffusion Bonding.”

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Xiong, HP., Chen, B., Guo, WL. et al. Wettability of PdNi(Co)-Cr alloys on Si3N4 ceramic and joining of Si3N4 to Si3N4 . Weld World 59, 33–44 (2015). https://doi.org/10.1007/s40194-014-0175-2

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  • DOI: https://doi.org/10.1007/s40194-014-0175-2

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