Silicon Carbide Brick is silicon carbide firebrick whose raw material is black silicon carbide. The content of SiC in silicon brick is about 72%~99%. The good characteristics of silicon carbide brick are high thermal conductivity, good wear resistance and strong acid slag resistance, making it widely used in the lining of alumina electrolysis cell and the furnace lining of electric furnace. Rongsheng Silicon Carbide Brick Producer has the ability to produce good quality carbide brick for sale with the best price! Any need? Just Email Rongsheng Refractory Company!
What Is Silicon Carbide Brick
Silicon carbide brick is a refractory brick, so it can also be called silicon carbide refractory brick or silicon carbide firebrick. The silicon carbide brick is made of the raw material black SiC. 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 SiC content of Silicon carbide brick is around 72%~99%, thus, it has the strong acid slag resistance. The major varieties are oxide-bonded silicon carbide brick, carbon-bonded silicon carbide brick, nitride-bonded silicon carbide brick, self-bonded silicon carbide brick, recrystallized silicon carbide brick, semi silicon carbide brick, etc. Silicon carbide refractory brick belongs to high performance refractory material.
Silicon Carbide Brick Properties
- High thermal conductivity.
- High-temperature strength.
- Good abrasion resistance.
- Good thermal shock resistance.
- Strong corrosion resistance.
- Small expansion coefficient.
Silicon Carbide Brick Application
The silicon carbide brick is widely used in industry. It can be used for the inner lining of metallurgical steel tube, the nozzle, the plug head, the bottom and hearth of the blast furnace, the non water cooling rails of the heating furnace, the nonferrous metal smelting distiller, the tray of the distillation tower, the side wall of the electrolyzer, the melting metal crucible, the sheds and the flame proof materials of the silicate industrial kiln; the oil and gas generator and the organic waste burning furnace in the chemical industry; the high-performance ceramics kiln aluminum electrolyzer, molten aluminum tube and tools for ceramic kiln, the bottom part of large and medium-sized blast furnace body, furnace waist and bosh, aluminum refining furnace lining, zinc distillation tank lining and so on.
Silicon carbide bricks can be divided into oxide bonded (clay bonded, mullite bonded, SiO2 bonded), nitride bonded (Si3N4 bonded, Sialon bonded), self-bonded (β-SiC bonded and recrystallized silicon carbide) and silicon infiltration reaction sintered silicon carbide bricks according to the bonding method.
- Oxide Bonded Silicon Carbide Bricks, including Clay-bonded silicon carbide brick, Mullite Bonded Silicon Carbide Bricks, SiO2 Bonded Silicon Carbide Brick.
- Nitride Bonded Silicon Carbide Bricks, including Si3N4 bonded silicon carbide brick, Sialon Bonded Silicon Carbide Brick.
- Self-bonding Silicon Carbide Bricks, including β-SiC Bonding Silicon Carbide Brick, Recrystallized Silicon Carbide Brick.
- Silicon infiltration reaction sintered silicon carbide bricks (SiSiC bricks).
Clay Bonded Silicon Carbide Brick
Clay bonded silicon carbide brick is a refractory brick fired with silicon carbide and binder clay. Silicon carbide brick is one of the earliest developed silicon carbide brick with the characteristics of thermal conductivity, small thermal expansion coefficient, good thermal shock resistance and good wear resistance.
Clay bonded silicon carbide brick choose black SiC as the main raw material and the soft clay as binder. The chemical composition is 98% SiC, 0.5% free carbon, 0.2% Fe, 0.6% SiO2 and the binder. The proportion of clay binder used in the past is relatively large, generally 10% to 15%, but now use 3% of clay and 5% of sulfite lye. The thermal conductivity of silicon carbide brick with less clay content is 3~4 times higher than that of multi clay bonded silicon carbide brick, and the softening temperature and slag resistance of the SiC brick are also higher.
In the manufacturing process of 3% clay bonded silicon carbide brick, the coarse, medium and fine SiC is prepared according to the grain gradation which can obtain the maximum bulk density. First dry and mix evenly, then add clay, dry mixed 3min, add pulp waste liquid (density 1.26 ~ 1.289/cm3) 4%, mixing. The moisture content of the slurry is about 1.5%. After the material is trapped 12h, the slurry passes through the 4mm screen and is molded with a brick press. The volume density of the brick is 2.5 ~ 2.79/cm3. After drying for 2~4 days under natural drying conditions, the silicon carbide brick is fired in a tunnel kiln with a firing temperature of 1400 degrees Celsius.
The products are used as ceramic kiln furnaces (sheds, stents, saggers, etc.), muffle hood for muffle furnace, lining brick for aluminum refining furnace, distillation tank for zinc distilling furnace, cement rotary kiln cooler, etc.
Mullite Bonded Silicon Carbide Bricks
Mullite bonded silicon carbide brick is made of high purity raw materials, with industrial silicon carbide as the main raw material through in situ generation and crystalline transformation of mullite phase to play a binding role. Compared to clay bonded silicon carbide brick, the performance is better.
SiO2 Bonded Silicon Carbide Bricks
SiO2 bonded silicon carbide bricks are produced by adding a certain amount of quartz powder, which enhances the oxidation resistance by binding silicon carbide particles together with the help of silica film generated. The high-temperature performance is better than clay bonded silicon carbide brick, and the high temperature strength is higher compared to mullite bonded silicon carbide brick.
Physical And Chemical Index Of Oxide Bonded Silicon Carbide Bricks
|Clay Bonded SiC||Mullite Bonded SiC||SiO2 Bonded SiC|
|Bulk Density g/cm3||2.5~2.6||2.55~2.65||2.6~2.7|
|Apparent Porosity %||≤20||≤16||≤15|
|Thermal Expansion Coefficient
|Thermal Conductivity W/(m·K) 1000℃||≥11||≥11||≥13|
Si3N4 Bonded Silicon Carbide Brick
Si3N4 bonded silicon carbide brick is a refractory brick sintered by SiC and Si powder with the characteristics of the combination of Si3N4. Si3N4 bonded silicon carbide brick is a new type of refractory material, in which Si3N4 exists between SiC grains in needle-shaped or fibrous crystalline form.
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Si3N4 bonded silicon carbide brick has good alkali corrosion resistance, anti-melt cryolite wettability, antioxidation, wear resistance, high thermal conductivity, thermal shock resistance, and extremely low conductivity.
Si3N4 bonded silicon carbide brick is mainly used in the bottom furnace lining of the blast furnace, the service life is more than 1 times higher than that of the traditional refractory material. In addition, Si3N4 bonded silicon carbide brick can also be used as the lining of the aluminum reduction cell, blast furnace tuyere water cooling pipe and the ceramic kiln. Silicon nitride bonded brick has the advantages of saving energy, improving the life span, and not polluting the environment.
Sialon Bonded Silicon Carbide Brick
Sialon bonded silicon carbide brick and Si3N4 bonded silicon carbide brick are both nitride bonded silicon carbide brick, the performance is generally similar, due to the different bonding phase condition in the microstructure and performance there are some differences, the alkali erosion and water vapor oxidation resistance of sialon bonded silicon carbide brick is slightly better compared to Si3N4 bonded silicon carbide brick, while the thermal shock resistance is slightly inferior to the latter, according to the specific situation they can be reasonably selected.
Physical And Chemical Index Of Nitride Bonded Silicon Carbide Bricks
|Si3N4 Bonded SiC||Si3N4 Bonded SiC||Sialon Bonded SiC|
|Bulk Density g/cm3||≥2.60||≥2.65||≥2.65|
|Apparent Porosity %||≤18||≤16||≤16|
|HMOR MPa 1400℃||≥40||≥45||≥45|
β-SiC Bonding Silicon Carbide Brick
β- SiC bonded silicon carbide brick is produced the by the combining of the original SiC particles and β- SiC generated by in-situ reaction of metal silicon powder and carbon powder in raw materials at high temperature，the bonded phase has small grain size and high activity, the oxidation resistance and resistance to water vapor oxidation erosion and mechanical strength is slightly inferior to Si3N4 bonded silicon carbide brick, but other properties are close to both.
Recrystallized Silicon Carbide Brick
Recrystallized silicon carbide brick is a refractory material directly bonded to silicon carbide with silicon carbide as raw material which is characterized by the existence of no second phase, composed of 100% alpha -SiC. The chemical composition of raw materials of recrystallized silicon carbide is as follows: 99.5% SiC, 0.2% free C, 0.08% Fe, and 0.08% free SiO2.
The recrystallized silicon carbide brick is mainly used as kiln furniture, having advantages of saving energy, increasing the effective volume of the kiln, shortening the burning cycle, improving the production efficiency and economic efficiency of the kiln. The recrystallized silicon carbide brick can also be used as burner nozzle head, ceramic radiation heating tube and element protection tube(especially for atmosphere furnace).
Physical And Chemical Index Of Self-bonding Silicon Carbide Bricks
|β-SiC Bonded SiC||Recrystallized SiC|
|Bulk Density g/cm3||≥2.63||≥2.65|
|Apparent Porosity %||≤17||≤15|
|HMOR MPa 1400℃||≥30||≥90|
|Thermal Expansion Coefficient
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Silicon infiltration reaction sintered silicon carbide brick (SiSiC brick)
SiSiC bricks are made by using reactive Si liquid or alloy to infiltrate into porous ceramics containing C through capillary force and react in situ to produce SiC to complete the densification process. SiSiC bricks have all the advantages of SiC ceramics, with high strength, high hardness, good thermal shock resistance, good wear resistance and corrosion resistance, high thermal conductivity, low coefficient of linear expansion, and excellent oxidation resistance, which is a High-tech ceramic material with excellent performance. Compared with R-SiC, it has excellent oxidation resistance, load-bearing capacity, and volume stability.
Physical And Chemical Index Of SiSiC Bricks
|Bulk Density g/cm3||≥3.0|
|Apparent Porosity %||≤0.5|
|HMOR MPa 1400℃||≥240|
|Thermal Expansion Coefficient
Silicon Carbide Brick Manufacturer
Rongsheng Kiln Refractory Company is an excellent silicon carbide brick manufacturer who can produces all kinds of high quality silicon carbide brick with the relatively low price. If you are in need of silicon carbide brick for your steel tube, alumina refining furnace, nozzle head, alumina reduction cell, etc. Email Rongsheng Silicon Carbide Brick Manufacturer for silicon carbide brick price low! Don’t be hesitated to quote! Email RS now!