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Magnalenz Induction Furnace

LINING MATERIAL PROPERTIES
TYPICAL PROPERTIES OF THREE REFRACTORY MATERIALS USED COMMONLY FOR MAKING INDUCTION FURNACE LINING
SR NO   SILICA (SiO2) ALUMINA (A1203) MAGNESIA (MG O)
1. Nature Acidic Neutral Basic
2. Melting Point, (0C) 1723 2050 2800
3. Free Energy at 14500 C, (kj / mol) -594 -758 -732
4. Average Thermal Conductivity between 00C and 12000C, (W/mk) 1.7 2.6 4.0
5. Expansion Coefficient between 00C and 12000C 12.2 8.2 13.8
6. RelativeThermal shock Resistance (R+6K/Ea) 715 480 345
7. Relative Cost (taking silica cost as unity) 1 5 to 10 5 to 10
Where:
6 = tensile strength
K= thermal conductivity
E= modulus of elasticity
a= thermal expansion coefficient
 TYPICAL SIZE GRADING OF SILICA RAMMING MASS
SIZE   TYPICAL CONTENT %
Coarse -4 mm + 0.85 mm 33
Medium -0.85 mm + 0.20 mm 30
Fine -0.20 mm + 0.063 mm 17
Ultrafine -0.063 mm 20
The ultrafine and fine particles combine with boric oxide to form a low-melting point glassy    phase which fills in the gaps between the coarse and medium size quartz grains and binds these grains with one-another.
Note: The bond is complete in the inner-most sintered layer which has been heated to above         
13000C. in the middle fritted layer, which has been exposed to a temperature between    
9000C and 13000C, the bond is partial. The outermost layer in contact with asbestos
Sheet is not heated beyond few hundred degrees centigrade, and the bond does form in This Layer.

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