Materials Transactions Online

Materials Transactions, Vol.58 No.04 (2017) pp.561-566
© 2017 The Japan Institute of Metals and Materials

Experimental Observation on Solid-State Reactive Diffusion between Sn-Ag Alloys and Ni

Misako Nakayama1, Minho O2 and Masanori Kajihara2

1Graduate School, Tokyo Institute of Technology, Yokohama 226-8502, Japan
2Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226-8502, Japan

The kinetics of the solid-state reactive diffusion between Sn-Ag alloys and pure Ni was experimentally observed to examine effects of addition of Ag into Sn on the growth behavior of compound at the interconnection between the Sn-base solder and the multilayer Au/Ni/Cu conductor during energization heating. In this experiment, sandwich (Sn-Ag)/Ni/(Sn-Ag) diffusion couples with Ag concentrations of y = 0.011-0.033 were prepared by a diffusion bonding technique, and then isothermally annealed at temperatures of T = 453-473 K for various periods up to 3169 h, where y is the mol fraction of Ag. After annealing, an intermetallic layer consisting of Ni3Sn4 was recognized between the Sn-Ag and Ni specimens in the diffusion couple. Here, the concentration of Ag in Ni3Sn4 is negligible. The mean thickness of the intermetallic layer is proportional to a power function of the annealing time, and the exponent of the power function takes values of 0.33-0.43 at T = 453 K and those of 0.54-0.62 at T = 473 K. Thus, the growth of the intermetallic layer is controlled by boundary and volume diffusion at T = 453 K. In contrast, at T = 473 K, interface reaction and interdiffusion contribute to the rate-controlling process of the intermetallic growth. The addition of Ag into Sn accelerates the intermetallic growth within the experimental annealing times.

[doi:10.2320/matertrans.M2016409]

(Received 2016/11/14; Accepted 2017/01/30; Published 2017/03/25)

Keywords: reactive diffusion, metallization, solder, conductor, intermetallic compounds

We were informed that JST had been performing urgent maintenance on J-STAGE service for security measures against the attack from outside on March 8th(JST) and stopping the service from 11 o'clock on the day to 15 o'clock on March 15th. This article was available to view from 15 o'clock on March 15th for the first time afterrestarting. The corrected publication date is March 15, 2017.

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