Corundum Mullite Castable

Stable high temperature performance

Good corrosion resistance 

Wear resistance

  Description

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. 

  Technical Data:

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

 

  Application:

High Strength wearing Resistant Corundum mullite Castable Applications

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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