Viscosity: SAC Alloy and Cu-Ti-Zr
The viscosity thermophysical property data is included with the TCS Solder Alloy Solutions Database (TCSLD) starting with version 4 (TCSLD4).
SAC Alloy
The viscosity is a critical material property needed when performing finite element simulations of soldering processes. Thermophysical data found in handbooks and finite element (FE) codes typically does not capture chemistry variation or data for novel/experimental materials. Below is the calculated viscosity for a specific chemistry of SAC compared with some measured values.
Figure 1: Viscosity of SAC alloy plus 3.07 wt% Bi along with experimental data from [2013Gan].
Cu-Ti-Zr
Viscosity is one of the important process parameters in the metallurgical industry, especially for high temperature alloys, such as Cu-Ti-Zr alloy which exhibits excellent properties of high strength and corrossion resistance. Below is the calculated viscosity of Cu-Ti-Zr alloys compared with the measurements by [2014Mau].
Figure 2: Viscosity of Cu-Ti-Zr of pure liquid of Zr20Ti20Cu60 with experimental data from [2014Mau].
References
[2013Gan] T. Gancarz, J. Pstruś, W. Gąsior, H. Henein, Physicochemical Properties of Sn-Zn and SAC + Bi Alloys. J. Electron. Mater. 42, 288–293 (2013).
[2014Mau] N. A. Mauro, M. Blodgett, M. L. Johnson, A. J. Vogt, K. F. Kelton, A structural signature of liquid fragility. Nat. Commun. 5, 4616 (2014).