Introduction
Experimental
Materials Preparation
Slag No. | Comp. (mass pct) |
\( a_{{{\text{SiO}}_{ 2} ( {\text{s)}}}} \)* | Liquidus Temp. [K (°C)]* | Viscosity (Pa s)* | |||
---|---|---|---|---|---|---|---|
SiO2
| CaO | 1823 K (1550 °C) | 1873 K (1600 °C) | 1823 K (1550 °C) | 1873 K (1600 °C) | ||
1 | 46 | 54 | 0.16 | 0.15 | 1770 (1497) | 0.18 | 0.14 |
2 | 63 | 37 | 0.84 | 0.78 | 1712 (1439) | 1.25 | 0.92 |
Graphite Grade | Manufacturing Method | Ash Content (mass pct) | Bulk Density (g/cm3) | C.T.E. ∥/⊥ (10−6/K) | Max. Grain Size (mm) | Open Porosity (pct) |
---|---|---|---|---|---|---|
A | isostatic | 0.03 | 1.77 | 4.3 | 0.015 | 9 |
B | vibration-molded | 0.07 | 1.73 | 1.2/1.9 | 0.8 | 15 |
C | extruded | 0.08 | 1.72 | 3.0/3.5 | 0.8 | 16 |
Experimental Procedure
Results
Run No. | Slag No. | Graphite Substrate | Temperature [K (°C)] | Duration (min) |
---|---|---|---|---|
SG13 | 1 | A | 1823 (1550) | 150 |
SG2 | 1 | A | 1873 (1600) | 120 |
SG11 | 1 | B | 1823 (1550) | 140 |
SG1 | 1 | B | 1873 (1600) | 150 |
SG7 | 1 | C | 1823 (1550) | 120 |
SG8 | 1 | C | 1873 (1600) | 60 |
SG15 | 1 | C | 1873 (1600) | 210 |
SG17 | 2 | A | 1823 (1550) | 160 |
SG14 | 2 | A | 1873 (1600) | 60 |
SG12 | 2 | B | 1823 (1550) | 25 |
SG16 | 2 | B | 1873 (1600) | 60 |
SG19 | 2 | C | 1823 (1550) | 210 |
SG18 | 2 | C | 1873 (1600) | 60 |
Wetting
Infiltration
Discussion
Interfacial Chemical Reactions
Wetting and Infiltration
Initial slag pellet diameter (m) | 0.01 |
Slag pellet mass (g) | 2.5 |
Moles of SiO2 in Slag 2 pellet (mol) | 2.6 × 10−2
|
Interfacial tension, γ (N/m) | 0.4* |
Interfacial area, A (m2) | 7.9 × 10−5
|
γ · A (J) | 3.9 × 10−5
|
ΔG
[1],1873 K (1600 °C), Slag 2 (J/mol) | −3.6 × 104
|
(J) | −936 |