Si3n4 Brick

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Product Description:

1. Performance of si3n4 brick

High strength

Low thermal expansion coefficient

Good thermal conductivity and thermal shock resistance

Good resistance to liquid aluminum erosion capability

High erosion

2. Chemical & Physical Specification of si3n4 brick


Index

Al electrolysis cell block

Kiln furniture brick

Pipe

SIC, % ≥

72

70

70

Si3N4, % ≥

20

20

20

Fe2O3, % ≤

0.7

0.7

0.7

Bulk Density, g/cm3

2.62

2.60

2.55

Apparent Porosity, % ≤

17

18

20

Cold Crushing Strength, Mpa ≥

150

140

120

MOR, Mpa

Room temp. ≥

42

40

35

1400°Cx0.5hrs ≥

45

45

40

Refractoriness Under Load (0.2Mpa,0.6%), °C ≥

1700

1700

----

Thermal Shock Resistance

(Water quenching at 1100), cycle ≥

30

30

----



3. Typically Application of si3n4 brick:

1.) Side wall Electrolyzer cell chemical-industrial reaction pot.
2.) Used as Kiln shed board, slide push board, sagger, Tuyere combined bricks.

3.) Used in blast furnace belly, Bosh and lower stack, cooling wall, rubbish burning furnace and boiler



4. Production process of si3n4 brick

a.) Choose metal silicon as raw material, add additives, then mix.

b.) Put the mixture into the mold, then make embryoid by machine pressing.

c.) Be reaction sintered by nitrogen protection in electric furnace.

5. Packing details of si3n4 brick

a.) The products are packed in wooden cases, and the wooden cases are tied up by 6 steel belts, then the wooden cases are put on fumigation wooden pallet.

b.) We also pack products as custom request.


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Q:The specific content is what gb/t2608-2012 brick
The provisions of the brick classification, technical requirements, test methods,
Q:Can iron oxide be used as refractory material?
Iron oxide can not be used as refractory material, but it can be used as refractory additive. Iron oxide can be used as pigment
Q:The introduction of silica brick
Acidic silica brick refractory material, has good acid resistance and slag erosion, softening temperature is as high as 1640 to 1670 DEG C, in the long-term use volume is relatively stable under high temperature.
Q:Brick
Acidic silica brick refractory material, has good acid resistance and slag erosion, softening temperature is as high as 1640 to 1670 DEG C, in the long-term use volume is relatively stable under high temperature.
Q:The production of brick, the ingredients of why join the waste brick?
Reduce crack production and improve yield. The amount of addition is related to the shape and weight of the brick. The bricks can be added to 20% weight less than 25kg; bricks above 25kg can be added to 30%; for the specific type of brick can be added 30%. into waste silica brick should pay attention to this problem
Q:The hot blast stove when the temperature did not rise against the brick interface decreased
How to keep the brick masonry temperature not lower than 600 DEG C, while the exhaust temperature is not higher than 400 DEG C.
Q:The chemical composition of silica brick and its physicochemical index?
Brick refers to the refractory products in more than 93% of the content of SiO2
Q:The high thermal conductivity of silica brick and traditional brick what is the difference?
Tridymite content high thermal conductivity silica brick is 70%, tridymite content of traditional brick is 60%, tridymite content high thermal conductivity of silica brick than tridymite high content of 10% traditional brick,
Q:What are the main constituents of refractory bricks?
Clay brick and clay brick are mainly composed of mullite (25% ~ 50%), glass phase (25% ~ 60%) and square quartz and quartz (up to 30%). Usually with hard clay as raw material, pre calcined mature material, and then with soft clay, semi dry or plastic molding, the temperature at 1300~1400 C fired clay brick products. Can also be added a small amount of water, glass, cement and other binders to make non burning products and amorphous materials. It is a refractory brick commonly used in blast furnaces, hot blast furnaces, heating furnaces, power boilers, lime kilns, rotary kilns, ceramics and refractory bricks.
Q:How to judge the quality of brick, clay brick, high alumina brick furnace from the appearance?
Mainly depends on the color and density of brick. Another black clay brick and brick with iron oxide formation and how much the size of bricks

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