Advantages of Low Carbon Magnesia Carbon Brick

November 05, 2018

Advantages of low carbon magnesia carbon brick

Magnesia carbon bricks mainly use fused magnesia, high carbon graphite as the main raw material, adding appropriate amount of antioxidants, and thermosetting phenolic resin as a binder to be formed by high pressure molding.

Magnesia carbon bricks have a carbon content of more than 12%, and are substantially free of antioxidants. The disadvantages are low strength and poor erosion resistance, and graphite is easily oxidized during use. Low-carbon magnesia-carbon bricks generally refer to a class of low-carbon composite materials with a total content of not more than 8%, containing magnesia and graphite as main raw materials, adding a certain amount of metal additives, and combining organic binders.

Low-carbon magnesia carbon bricks have high strength, strong corrosion resistance and resistance to molten steel scouring, especially suitable for use in areas where steel liquid scouring is severe.

With the reduction of carbon content in magnesia carbon bricks, especially when the carbon content is less than 10%, the spalling resistance of magnesia carbon bricks is significantly reduced. This is due to the inevitable result of the inability of carbon to form a continuous phase or a continuous decrease. In order to improve the anti-flaking property of low carbon magnesia carbon bricks, ultrafine graphite can be used instead of flake graphite. When the total carbon content exceeds 6%, the superiority of ultrafine graphite can be reflected in the peeling resistance of magnesia carbon bricks. The addition of graphite can inhibit the over-burning of the brick and reduce the elastic modulus of the brick, thereby improving the peeling resistance of the low carbon magnesia carbon brick. The table below compares the performance of magnesia carbon bricks and low carbon magnesia carbon bricks:

Items

Low carbon magnesia carbon brick

Magnesia carbon brick

MgO

86

78

C

7

15

After drying

Apparent porosity (%)

4.5

2.5

Bulk density  ≥ g/cm³

3.31

3.30

Cold crushing strength (Mpa)

30

40

Bending strength(Mpa)

10

17

 After heating in coke(1000℃)

Apparent porosity (%)

8.5

9.0

Cold crushing strength (Mpa)

25

35

Bending strength(Mpa)

6

8

Wear resistance

Good

Good

Corrosion resistance

Excellent

Good

Oxidation resistance

Excellent

Good

 

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