Mullite Brick

Mullite bricks are high alumina refractory products with mullite (3Al2O3·2SiO2) as the main crystal phase.

Apparent Porosity  (%)                                  ≤17


Bulk Density (g/cm3)                                    ≥2.55


Cold Crushing Strength  (Mpa)                    ≥80


0.2Mpa Refractoriness Under Load T0.6 ℃ ≥1600


   PRODUCT DESCRIPTION

Introduction:

Mullite bricks are high alumina refractory products with mullite (3Al2O3·2SiO2) as the main crystal phase. The products are divided into sintered mullite bricks and fused mullite bricks. Sintered mullite bricks are mostly made of synthetic mullite clinker and high alumina bauxite clinker as raw materials through batching, high-pressure molding, and high-temperature firing. The firing temperature is above 1600°C. 

Features:

The product has good high temperature performance, high refractoriness under load, low creep rate under high temperature, good thermal shock resistance, small thermal expansion coefficient, and acid slag erosion resistance.

Applications:

Mullite bricks are commonly used in hot blast furnaces for ironmaking at a high temperature above 1200℃, parts and slag lines of torpedo cars impacted by molten iron, roof of steel-making electric arc furnaces, ceramic industrial furnaces, regenerator arches and superstructures of glass melting furnaces, cement lining and rotary kiln lining, etc.


   TECHNIQUE DATA

Item

MU 60

MU 65

MU 70

MU 75

Chemical Composition

Al2O3

≥60

≥65

≥70

≥75

SiO2

≤35

≤33

≤26

≤24

Fe2O3

≤1.0

≤1.0

≤0.6

≤0.4

Apparent   Porosity

≤17

≤17

≤17

≤18

Bulk Density   g/cm3

≥2.55

≥2.55

≥2.55

≥2.55

Cold Crushing   Strength Mpa

≥60

≥60

≥80

≥80

0.2Mpa   Refractoriness Under Load T0.6

≥1580

≥1600

≥1600

≥1650

Permanent   Linear Change On Reheatin (%)1500℃X2h

0+0.4

0+0.4

0+0.4

0+0.4

Thermal Shock   Resistances 100℃ water cycles

≥18

≥18

≥18

≥18

201000℃ Thermal Expansich10-6/℃

0.6

0.6

0.6

0.55

Thermal   Conductivity (W/MK) 1000℃

1.74

1.84

1.95

1.95


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