Effect of Trace Phosphorus on the Dross Formation in Tin-Copper-Nickel Wave Solder

Article Preview

Abstract:

Additions of trace elements such as Phosphorus (P) and Germanium (Ge) are common practice to improve the oxidation resistance in Tin-Copper (Sn-Cu) wave solder systems, however, little insights are available regarding their combined role. In this article, the effect of trace P (<100ppm), in the presence of Ge (<100ppm), on the phase composition and microstructure of Sn-Cu-Ni wave solder dross is studied using various techniques including Synchrotron XRPD, SEM, FIB and TEM. We find that P additions, in the presence of Ge, result in the formations of SnO, SnO2 and Ni2SnP intermetallic in the dross whereas only SnO is present in the P-free equivalent. The crystal structure of Ni2SnP is identified as orthorhombic with the space group Pnma. Based on the findings, it is evident that P not only influences the oxidation state of tin oxides but also reduces the concentration of effective Ni in the alloys via the formation of Ni2SnP intermetallic.

You might also be interested in these eBooks

Info:

Periodical:

Solid State Phenomena (Volume 273)

Pages:

9-13

Citation:

Online since:

April 2018

Export:

Price:

Permissions CCC:

Permissions PLS:

Сopyright:

© 2018 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

[1] T. Nishimura, US Patent No. US6180055, (2001).

Google Scholar

[2] K. Nogita, T. Nishimura: Scripta Materialia, Vol. 59 (2008) pp.191-194.

Google Scholar

[3] K. Nogita, C.M. Gourlay, T. Nishimura: JOM, 61 (2009) pp.45-51.

Google Scholar

[4] C.M. Gourlay, J. Read, K. Nogita, A.K. Dahle, J. Electron. Mater., 37 (2008) pp.51-60.

Google Scholar

[5] K. Nogita, H. Yasuda, C.M. Gourlay, S. Suenaga, H. Tsukamoto, S.D. McDonald, A. Takeuchi, K. Uesugi, Y. Suzuki: Transactions of The Japan Institute of Electronics Packaging, 3 (2010) pp.40-46.

DOI: 10.5104/jiepeng.3.40

Google Scholar

[6] K. Nogita, M. A. A. M. Salleh, X. Q. Tran, J. Read, S. Smith, S. D. McDonald: Materials Science Forum, Vol. 857 (2016), pp.49-52.

Google Scholar

[7] K. Nogita, C.M. Gourlay, J. Read, T. Nishimura, S. Suenaga, A.K. Dahle: Materials Transactions, 49 (2008) 443-448.

DOI: 10.2320/matertrans.mbw200713

Google Scholar

[8] K. Sweatman, T. Nishimura,T. Fukami: Proceedings of SMTA International (2015) pp.314-320.

Google Scholar

[9] S. Furuseth and H. Fjellvåg: Acta chemica Scandinavica, Vol. 39a (1985), pp.537-544.

DOI: 10.3891/acta.chem.scand.39a-0537

Google Scholar

[10] V. Keimes, H.M. Blume, A. Mewis: Zeitschrift fuer Anorganische und Allgemeine Chemie,Vol. 625 (1999) pp.207-210.

DOI: 10.1002/(sici)1521-3749(199902)625:2<207::aid-zaac207>3.0.co;2-i

Google Scholar

[11] F.J. Garcia-Garcia, A.K. Larsson, S. Furuseth: Journal of Solid State Chemistry, Vol.166 (2002) pp.352-361.

Google Scholar

[12] S. Furuseth and H. Fjellvåg: Acta chemica Scandinavica, Vol. 48 (1994) pp.134-138.

Google Scholar

[13] C. Schmetterer, M. Wildner, G. Giester, K.W. Richter, H. Ipser: Zeitschrift fuer Anorganische und Allgemeine Chemie, Vol. 2 (2009) pp.301-306.

DOI: 10.1002/zaac.200800409

Google Scholar

[14] F.J. Garcia-Garcia, A.K. Larsson, S. Furuseth: Solid State Sciences, Vol. 5 (2003) pp.205-217.

Google Scholar