Wettability of Al2O3-MgO substrates by molten aluminum

Abstract

Experimental Data and the Calculated Values from the Eq. [25], the activities of the components of those Bi-based Wagner Formula of Activity of Solute Zn in the Zn-Sn-Bi dilute solutions have been predicted, as shown in Tables V at 823 K through VIII. It can be seen from the tables that the predicted values are in good agreement with both the experimental a Zn values and the values calculated from the Wagner's formula, x Zn x Sn x Bi MIVM Wagner [13] Experiment [13] respectively, and all the predicted average relative errors 0.015 0.015 0.970 0.047 0.045 0.047 S 1 ϭ (100/n)͚Ȋ(a 1,exp Ϫ a 1,pre )/a 1,exp Ȋ are acceptable. These 0.015 0.025 0.960 0.047 0.045 0.046 results show that MIVM is an accurate and reliable method 0.015 0.0375 0.9475 0.046 0.044 0.045 for predicting the thermodynamic properties of the Bi-based 0.015 0.050 0.935 0.046 0.044 0.045 ternary dilute solutions. 0.025 0.015 0.960 0.078 0.075 0.075 In conclusion, the coordination numbers in the MIVM 0.025 0.025 0.950 0.077 0.074 0.076 can be calculated from common physical quantities of pure 0.025 0.0375 0.9375 0.077 0.074 0.071 metals. A significant advantage of the model lies in its ability 0.025 0.050 0.925 0.077 0.073 0.070 to predict the thermodynamic properties of ternary liquid 0.0375 0.015 0.9465 0.116 0.112 0.117 0.0375 0.025 0.9375 0.116 0.111 0.116 alloys using only the binary infinite dilute activity coeffi-0.0375 0.0375 0.9245 0.115 0.110 0.106 cients, and the predicted values are in good agreement with 0.0375 0.050 0.9125 0.114 0.109 0.104 the experimental data of ternary liquid alloys. These results 0.050 0.015 0.935 0.154 0.150 0.151 show that the model is reliable, convenient, and economic. 0.050 0.025 0.925 0.153 0.148 0.149 0.050 0.0375 0.9125 0.152 0.146 0.148 0.050 0.050 0.900 0.152 0.144 0.147 REFERENCES Wagner: S 1 ϭ Ϯ2.68 pct MIVM: S 1 ϭ Ϯ3.97 pct 1.

Influence of Grain Refiners on the Wettability of Al2O3 Substrate by Aluminum Melt

“…The high contact angle between Al and alumina in literature [29][30][31][32][33][34][35][36][37][38] indicates a large c sl . However, the c sl between aluminum and TiC or TiB 2 is much smaller as inferred from the good wettability.…”

“…The measured contact angles between Al 2 O 3 and Al vary from 60 to 167 deg at 700°C to 1400°C in various literature. [29][30][31][32][33][34][35][36][37][38] The large scatter in measured contact angle values is due to different test methods, vacuum states, temperatures, sample purities, etc. It is important to point out that Al oxidizes easily, even at 10 À49 bar partial pressure at 700°C.…”

Controlled undercooling of liquid iron in contact with Al2O3 substrates under varying oxygen partial pressures

“…[23] This is because the oxygen content is known to affect the contact angle and surface tension of liquid metals [24][25][26][27][28][29][30][31][32] by affecting the surface energies involved in wetting (g LG , g LO , and g OG, where L 5 liquid, O = oxide substrate, and G 5 gas). Heterogeneous undercooling is also affected by the values of surface energies, but in the case of the liquid-solid-oxide system (g LS , g LO , and g OS ), the control of the oxygen partial pressure (PO 2 ) is crucial.…”

Wettability of Silicon Carbide Particles by the Aluminium Melts in Producing Al-SiC Composites

“…Due to the higher density of corundum, the volume of oxide decreases and a fracture of the layer occurs. At high temperatures a reaction between liquid aluminium and the alumina layer is possible, resulting in a volatile compound [9][10][11][12][13]:…”