(1) The construction is convenient.
(2) High-strength explosion-proof.
(3) High temperature resistance and high operating temperature.
(4) Under 0.2mpa pressure, the softening temperature of the load is high.
(5) High temperature volume stability, high strength.
(6) Anti-slag slag has strong chemical corrosion.
(7) The overall structure is stable and resistant to spalling.
(8) Quenching and rapid heat resistance, excellent thermal shock resistance.
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High strength wearing resistant corundum mullite castable is made from fused white corundum, fused zirconia corundum, fused mullite, SiC raw materials, binders and additives. High purity calcium aluminate cement and silica micro powder are usually used as binders of corundum mullite castable. Corundum and mullite aggregate and fines are properly formulated according to closest packing principle, so corundum mullite castable has high bulk density, high mechanical strength and excellent abrasion resistance. As it combines the advantages of corundum and mullite, corundum mullite castable also has excellent thermal shock resistance.
High Strength wearing Resistant Corundum mullite Castable properties
High refractoriness, good thermal shock resistance.
Excellent wear resistance and high temperature mechanical strength.
Good structural stripping resistance, low creep rate.
Excellent chemical corrosion resistance, slag corrosion and permeation resistance.
Low thermal expansion rate, good volume stability.
|
Item |
NM-1 |
NM-2 |
NM-3 |
|
Al2O3 % ≥ |
75 |
80 |
85 |
|
CaO % ≤ |
2 |
2 |
2 |
|
Bulk density g/cm3 > |
2.75 |
2.8 |
2.9 |
|
Crushing strength Mpa(1400℃, 3h) |
>95 |
>105 |
>110 |
|
Modulus of rupture Mpa(1400℃, 3h) |
>13.5 |
>15.0 |
>16.0 |
|
Room temperature abrasion loss cm3 |
<8.5 |
<7.3 |
<6 |
|
0.2MPa, refractoriness under load beginning temperature ℃ |
>1490 |
>1530 |
>1560 |
|
Thermal shock resistance (900℃, water cooling)/times |
>20 |
>20 |
>20 |
|
Max. working temperature ℃ |
1550 |
1600 |
1600 |
|
Reheating linear change rate % |
<-0.3 |
<-0.2 |
<-0.2 |
High-strength wearing resistant corundum mullite is especially suitable for places where suffer strong abrasion, washing out and thermal shock. The main application of corundum mullite castable is power plant circulating fluidized bed boiler and other industrial boiler. Sometimes, silicon carbide is added into alundum mullite castable to increase its wearing-resistance. Corundum mullite castable is also widely used in alumina suspension roasting furnace. Other applications of corundum mullite castable are: petrol refining catalytic cracking equipment, heating furnace tapping spout, large capacity cement kiln hood and kiln end, coal injection nozzle and other industrial kilns and furnaces.
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