Surface tension of superheated and undercooled liquid Co–Si alloy

Abstract

The surface tension of superheated and undercooled liquid Co 25wt.% Si alloy was measured by an electromagnetic oscillating drop method. The experimental temperature regime was from 1384 to 2339K and a maximum undercooling of 223K (0.14TL) was achieved. The surface tension of liquid Co 25wt.% Si alloy is 1.604Nm−1 at the liquidus temperature of 1607K, and its temperature coefficient is −4.0×10−4Nm−1K−1. On the basis of previous research results of pure Co and Si, an expression is developed to predict the surface tension of binary Co–Si alloy system. The other thermophysical properties, such as the viscosity, the solute diffusion coefficient, and the density of liquid Co 25wt.% Si alloy are also derived by the relevant theoretical models.

Thermodynamic, surface and structural properties of liquid Co-Si alloys

“…5). The same is observed for the surface tension of the Co 59 Si 41 reported by Wang et al [38]. The two surface tension data sets [36,37] differ up to 18 % and agree well with the QCA isotherm, as shown in Fig.…”

“…On the other side, those data exhibit the same trend as the CFM isotherm, but are shifted with respect to the surface tension of cobalt, recently reported in [62] that is higher than the corresponding reference data [36,37]. The discrepancies between the data sets [36][37][38], measured by the sessile drop method, probably arise from differing amounts of oxygen present in the working atmospheres and/or materials used [41]. …”

“…surface tension experimental data of liquid Co-Si alloys are compared with model predicted values as well as with literature data sets reported in [36][37][38].…”

Size dependent interface energy and its applications

“…13ashows the comparison of γ lv0 (T )/γ lv0 (T m ) between the predictions of Eqs. (5.6b) and (5.3)and experimental evidences for transition metals Ni, Co, Re and W with good agreement[179,[202][203][204]. The experimental data for liquid Ni, Co, Re and W in the temperature ranges of 1573-1893, 1541-1943, 2800-3600 and 3360-3700 K, respectively, correspond to the undercooling of 155, 227, 659 and 320 K as well as the overheating of 165, 175, 141 and 20 K. These plots in terms of Eqs.…”

Optimizing electromagnetic levitation design to enhance thermodynamic measurement

“…With specific reference to the processing parameters, it is found in the published literature that as the pressure of the atomizing gas increases, with all the other variables being kept constant, the mass median diameter decreases [42][43][44][45][46][47][48]. This is attributed to the conjoint and mutually interactive influences of: (i) an increase in the mass flow rate, and (ii) an increase in kinetic energy of the gas.…”