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Silicon Carbide Bricks
Introduction
Silicon Carbide Bricks, (also be called silicon carbide refractory brick or silicon carbide firebrick) are a kind of refractory materials made of SiC as the main raw material. The silicon carbide content is from 72% to 99%. Generally, black silicon carbide (SiC content above 96%) is used as the raw material, and the binder (or no binder) is added, and then it is prepared by batching, mixing, molding and firing. The main crystal phase is silicon carbide. Silicon carbide refractories are mainly divided into several types of clay bonding, Si3N4 bonding, Sialon bonding, β-SiC bonding, Si2ON2 bonding and recrystallization. It is stable to acidic slag and has good wear resistance, corrosion resistance, high temperature strength, good thermal shock stability, high thermal conductivity, and low thermal expansion coefficient. They are high-performance refractory materials.
The silicon carbide brick is made of black SiC raw material. The main crystal phase is SiC. The silicon carbide brick is formed by matching the binding agent, mixing, molding and firing process. The moth hardness of silicon carbide brick is 9.
The silicon carbide castables do not weaken on heating and display superior operational properties: the compressive strength is 40–80 MPa at sintering temperature 400°C and 50–85 MPa at 1300°C, the strain onset temperature under a load of 0.2 MPa is 1700–1510°C; thermal stability (1300°C - water) is better than 45 heating/cooling cycles (1300°C - water); no change in linear and volume dimensions was observed on heating. The newly-developed castables can find application in various sectors of industry, in particular, as the refractory material for the lining of Whiting furnaces and porcelain kilns.
In view of its high mechanical strength and abrasiveness over a wide temperature range, SiC is used extensively in the production of silicon carbide refractorie.
Silicon carbide refractories have high physicomechanical properties and endurance, high mechanical strength, resistance to deformation at high temperature, and as a result of the absence of polymorphic transformations, it has a low linear thermal expansion coefficient (LTEC) and high thermal conductivity.
Silicon carbide refractories are mainly manufactured from granular semidry or plastic mixes by compaction, ramming, or stretching. In industry there is extensive use of silicon carbide based on silica, high-alumina, argillaceous and nitride binders.
Properties
1.The more SiC content, the better the alkali resistance
2.Silicon carbide in silicon carbide castables is especially advantageous at high temperatures (1100 ℃).
3.Produce partial gaps around the SiC particles to improve the thermal shock resistance and strength of the refractory castable.
4.The important chemical properties of silicon carbide are oxidation resistance, corrosion resistance, and the first reaction. When heated to 1000 ° C, the surface of SiC is oxidized and a SiC 2 film is formed. This film hinders the diffusion of oxygen, delays the oxidation rate, protects the silicon carbide covered by the film, improves the service life of the silicon carbide material.
5.Because the substrate is SIC, silicon carbide is wear resistant, silicon carbide has high hardness.
6.Silicon carbide is widely used in abrasives, heating elements, structural ceramics and refractory materials due to its high hardness, electrical conductivity, high temperature resistance and high strength.
Chemical & Physical Index
Silicon Carbide Refractories | |||||
Items |
Unit |
SiO2 Bonded Silicon Carbide Bricks |
Azoxty-cornpounds Bonded Silicon Carbide Bricks |
Mullite Bonded Silicon Carbide Bricks |
|
Chemical Composition |
SiC |
% |
≤18 |
≤18 |
≥10 |
SiO2 |
% |
≤8 |
~ |
~ |
|
Fe2O3 |
% |
≤1 |
≤0.6 |
≤1 |
|
Al2O3 |
% |
≥90 |
≥80 |
≥85 |
|
Apparent Porosity |
% |
~ |
~ |
≥10 |
|
Bulk Density |
g/cm3 |
≥2.56 |
≥2.60 |
≥2.56 |
|
Cold Crushing Strength |
Mpa |
≥80 |
≥100 |
≥70 |
|
Refractoriness under Load |
℃ |
≥1600 |
≥1620 |
≥1550 |
|
Thermal Shock Stability （Time/850） |
℃ |
≥40 |
≥40 |
≥35 |
|
Thermal Conductivity |
w/m*k |
≥8 |
~ |
~ |
|
Normal Temperature Bending Strength |
Mpa |
≥25 |
≥30 |
≥25 |
|
High Temperature Bending Strength1250℃*1h |
Mpa |
≥20 |
≥25 |
≥20 |
|
Maximum Service Temperature |
℃ |
1400 |
1500 |
1400 |
|
Material |
Silicon carbide refractory castable |
|||
Max working temp.(℃) |
1550 |
1650 |
1790 |
|
Bulk density after drying at 110℃, g/cm3 |
3 |
3 |
2.95 |
|
Chemical analysis, % |
Al2O3≤ |
21 |
9 |
6 |
SiC+C≥ |
56 |
78 |
88 |
|
Cold bending strength (Mpa) |
110℃*24H |
12 |
12 |
18 |
1100℃*3H |
15 |
15 |
20 |
|
Cold crushing strength |
110℃*24H |
80 |
90 |
120 |
(Mpa) |
1100℃*3H |
100 |
120 |
135 |
Linear change after heating, % |
1000℃*3H |
-0.2 |
-0.1 |
-0.2~0.2 |
1400℃*3H |
-0.1 |
-0.1 |
-0.2~0.2 |
|
Thermal conductivity, kcal/mh, ℃ |
8 |
11 |
12 |
|
Water Addition |
7-8% |
6-7% |
6-7% |
|
Construction method |
Vibration |
Vibration |
Vibration |
|
Application |
Garbage incinerator |
Nonferrous Metal Furnaces, Cement kiln & other Industrial Furnaces |
Nonferrous Metal Furnaces, Cement kiln & other Industrial Furnaces |
|
Characteristics:
l Corrosion resistance
l Good wear resistance
l High thermal conductivity
l High temperature strength
l Good thermal shock resistance
l Low thermal expansion coefficient
l Strong corrosion resistance
l Good anti-oxidation resistance
Application :
Our silicon carbide refractories are widely used in as lining of large aluminum electrolytic cell. The products can also employed to enlarge the tank capacity, enhance the thermal conductivity, alllow rapid cooling and boost up the tank production capacity at the same time. Alumina and cryolite of eutectic content on the surface can protect the tank lining work layer, prolong the tank's service life, therefore, silicon nitride bonded silicon carbide bricks is a welcomed product in aluminum industry.
Package
For Refractory Castables
1 ) . In 1MT Big Bag
2 ) . 25KG PP Big Bag In 1MT Big Bag
3 ) . customized packing as required
For Refractory Bricks
1 ) . Wooden pallet wrapped with plastic film and bundled belts.
2 ) . customized packing as required
Package
1 ) . In 1MT Big Bag
2 ) . 25KG PP Big Bag In 1MT Big Bag
3 ) . customized packing as required
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