Kinetics and Thermodynamics of Carbon Isothermal and Non-isothermal Oxidation in MgO-C Refractory with Different Air Flo
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TODAY, MgO-C bricks are widely used in steel industry due to their excellent resistance to slag corrosion and thermal shock. The contained carbon increases the corrosion resistance of bricks and improves their thermo-mechanical properties, particularly their thermal shock resistance. According to German standards[1,2] the MgO products are classified as follows: – Calcined magnesia bricks containing carbon (10min
1.76 —
0.38 0.17
2.40 2.48
0.40 —
2.66 2.64
0.66 0.31
3.13 3.08
1.11 0.38
26 20
-14
Ln(r)
- MgO-7%C -14.5 -15
Gas: Air Flow rate: 200Nl/h
MgO-14%C -
-16 0.0004 0.0005 0.0006 0.0007 0.0008 0.0009
0.001
1/T [1/K]
diffusion coefficient [cm2/s]
Fig. 12—Arrhenius plots of the oxidation rate for MgO-7 pct C and MgO-14 pct C.
1.8 1.6
MgO-5%C [14] MgO-15%C [14]
1.4
MgO-25%C [14]
1.2
MgO-7%C (present work) MgO-14%C (present work)
1 0.8
MgO-14.3%C [11] MgO-15%C [8]
0.6 0.4 0.2 0 1000
1673 K (1400)
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