Category Archives: Carbon Bricks Series

Jun 30, 2021

Alumina Carbon Bricks

Catalog

★ What are the Common Alumina Carbon Brick

Burned Micropores Alumina-Carbon Brick
Burned Micropores Alumina-Carbon Brick features
Burned Microporous Alumina-Carbon Brick Technique Data
Aluminium Carbon-based Refractories for Continuous Casting Tundish

★ Aluminum Carbon Bricks Application
★ Aluminum Carbon Bricks Manufacture Process
★ What are the Raw Materials and Binders of Aluminum Carbon Bricks

★ What are the Common Alumina Carbon Brick

1.Burned Micro-pores Alumina-Carbon Brick is mainly used for working lining of bosh above the air pip and belly. The average pore diameter of micro-pore alumina carbon brick is less than 1µm, and the volume percentage of the pores less than 1µm is no less than 70%.

Burned Microporous Alumina-Carbon Brick features

(1) Low porosity & low air permeability.
(2) high crushing strength & high thermal conductivity.
(3) Anti-slag, anti-alkali, anti-erosion ability.
(4) Good thermal shock stability.

Burned Microporous Alumina-Carbon Brick Technique Data

2. Aluminium Carbon Refractories used for Continuous Casting Tundish, mainly include upper nozzle, lower nozzle, and stoppers, which are also called special-shaped aluminum carbon bricks. The raw materials of continuous casting nozzles and stoppers are corundum and graphite. A small number of additives are added to raw materials during the production process. Phenolic resin is used as a binder of alumina carbon nozzles and stoppers. After mixing, molding and drying, green bodies are burned in a non-oxidizing firing kiln. The firing temperature is 1350 °C, after machining, anti-oxidation coating can be spayed to the surface to prolong their service life.

Aluminum Carbon Refractories for Continuous Casting Tundish

(1) Good integrity and safe use.
(2) To better purify the molten steel.
(3) High strength, good resistance to molten steel, and slag erosion.
(4) Wear resistance and long service life.

★ Aluminum Carbon Bricks Application

Aluminum carbon bricks can be used in blast furnaces, continuous casting tundishes (long nozzles, submerged nozzles, stoppers, upper and lower nozzle bricks, slide plate bricks), ladle, hot metal cans, torpedoes, and other thermal equipment.

★ Aluminum Carbon Bricks Manufacture Process

Add graphite raw materials to alumina raw materials (corundum, mullite, bauxite), add small amounts of other raw materials such as silicon powder and SiC powder, then mixed with resin or asphalt binder, molded by press machine and finally fired at about 1300 ° C in a reducing atmosphere kiln.

★ What are the Raw Materials and Binders for Making Aluminum Carbon Bricks

For the unfired aluminum carbon bricks, the commonly used raw materials are corundum, mullite, first-grade high-alumina bauxite clinker, graphite, SiC, and Si powder. Commonly used binding agents are resin, tar, asphalt, and the like. Different raw materials should be used for the production of aluminum carbon bricks based on applications.

The above is a brief introduction to aluminum carbon bricks. If you need to purchase aluminum carbon bricks, RS Refractory can supply you with the best quality products at a competitive price. We can also customize refractory products according to your requirements and provide you best refractory materials and engineering solutions.

Jun 30, 2021

Magnesia Aluminum Carbon Brick

The aluminum-magnesium carbon fire brick has the advantages of anti-erosion, anti-flaking, balanced erosion, safe use, less slag dipped in steel, and easy unpacking. Alumina magnesia carbon fire brick is mainly used for the lining of Shengsteel used in harsh conditions. Refractory alumina magnesia carbon bricks used in the molten pool part and the bottom part of the continuous casting large tundish and the refining package outside the furnace.

Aluminum Magnesia Carbon Brick Advantages

1.Aluminum magnesium carbon brick has anti-erosion
2.Aluminum magnesium carbon brick has anti-flaking
3.Aluminum magnesium carbon brick has balanced erosion
4.Aluminum magnesium carbon brick has safe use
5.Aluminum magnesium carbon brick has less slag on steel
6.Aluminum magnesium carbon brick has easy to unpack

Aluminum Magnesia Carbon Brick Disadvantages

Aluminum magnesium carbon refractory brick has a large thermal conductivity coefficient, large heat dissipation, which is easy to occur in cold steel. Therefore, when using magnesium-aluminum carbon refractory brick as the lining of steel, heat insulation measures should be taken.

Aluminum Magnesia Carbon Brick Specification

Aluminum Magnesia Carbon Brick Application

1.Aluminum magnesium carbon brick is mainly used for ladle lining.
2.Aluminum magnesium carbon brick tapping trough, large converter, and ultra-high power electric furnace ladle lining and refining furnace lining.

Aluminum Magnesia Carbon Brick Properties

Aluminum magnesium carbon brick refractories are developed on the basis of high-performance magnesium carbon and aluminum carbon refractories. Aluminum magnesium carbon fire bricks are substitutes for high alumina bricks and dolomite brick linings, but in contrast, such alkalis aluminum-magnesium carbon brick composed of two refractory oxides of acidity and acidity has excellent chemical and thermodynamic stability, high-density aluminum magnesia bricks have excellent thermal and mechanical properties.

1.High Resistance to Molten Steel Penetration
Due to the expansion of the spinel-penetration reaction between alumina and magnesia during use, an integral refractory lining can be formed, which can effectively prevent the penetration of molten steel from the joint between the lining bricks into the interior of the brick.

2.Excellent Slag Resistance
In addition to the role of graphite, the spinel formed during use can absorb Feo in the slag to form a solid solution, while Al2o3 reacts with Cao in the slag to form a high-melting Cao-Al2o3 compound, refractory blocks the pores and increases melting. Body viscosity, can de to achieve the purpose of inhibiting slag penetration

3.High Mechanical Strength
Aluminum carbon magnesium refractories contain less graphite, generally, between 6% and 12%, so high alumina magnesia carbon refractory bricks have large bulk density, low porosity, and high strength.

Aluminum Magnesia Carbon Brick Improve the Slag Resistance Measures

Under certain conditions of ladle operation, the slag permeation rate depends on the porosity of the lining brick and the viscosity of the slag wet slag. Therefore, it is possible to ensure the low slag content of the brick by controlling the graphite content and dispersion in the brick. Wetting, thereby inhibiting the penetration of slag, and at the same time, by increasing the Al2o3 content in the brick, reacting with CaO in the slag to form a high melting point aluminum-calcium series compound, blocking the pores and increasing the melt viscosity, so as to inhibit the slag penetration and finally improve Performance of aluminum-magnesium carbon brick.

RS Refractory Factory Provide High-Quality Refractory Bricks

RongSheng Refractory factory has been engaged in the refractory material industry for more than 20 years. We have a big technological team, there are more than 15 senior designers for the furnace&kiln. They are good at the different technological fields, for the exam, refractory bricks, castable refractory material, lightweight insulation firebricks, and prefabricated bricks according to client requirements.

RongSheng Refractory Factory from the raw materials, production, testing, all aspects in strict accordance with the IS09001 standard implementation, professional testing personnel at all levels, with quality products and services as the highest goal.

Jun 30, 2021

Silicon Carbide Bricks

Silicon Carbide Bricks Classification

Silicon carbide bricks can be divided into different categories based on SiC content, binder types and quantity. According to binder types, SiC bricks can be divided into:
Oxide bonded SiC bricks. The bonding phase is Al2O3-SiO2 series silicate, including clay bonded silicon carbide bricks, mullite bonded silicon carbide bricks and silica bonded SiC bricks.

Nitride bonded silicon carbide bricks.

The bonding phases are Si3N4, Si2N2O, Sialon and other covalance compounds.

Self bonded SiC bricks.

Including β-SiC bonded SiC bricks and re-crystallization SiC bricks, Siliconizing reaction sintered SiC bricks. SiC and free Si consisted engineering ceramics material. Normally, SiC products with less than 50% SiC are called semi SiC refractory, including clinker SiC refractory, high alumina SiC refractory, zircon SiC refractory, mullite SiC refractory and Corundum SiC refractory, etc.

Oxide Bonded Silicon Carbide Bricks

The mineral phases of oxide bonded silicon carbide bricks are quartz, mullite and silicate glass phase. Based on the difference of bonding phases, oxide bonded SiC bricks can be divided into SiO2 bonded SiC bricks, mullite bonded SiC bricks and clay bonded SiC bricks.

Clay Bonded Silicon Carbide Bricks

Clay bonded silicon carbide bricks contain 50%~90% SiC, binding material is binding clay, usually added in sillimanite, andalusite, kyanite and other mineral fine powder. The sintering temperature is between 1350~1450℃. The quantity and types of binding material can directly affect the performance of clay bonded SiC bricks. With the increase of clay content, oxidization resistance is improved, but thermal conductivity, refractoriness under load temperature, thermal shock resistance and high temperature strength will all decrease.
Clay bonded SiC refractory are mainly used as muffle boards of various kinds of industrial kilns and furnaces, ceramic kiln furniture ( refractory slab, sagger and so on). But due to the clay bonding phase in SiC refractory, Clay bonded SiC refractory high temperature performance is greatly affected.

Mullite Bonded Silicon Carbide Bricks

Mullite bonded silicon carbide bricks are developed on basis of clay bonded SiC refractory. The bonding raw material are high purity Al2O3 and SiO2 micro powder or fine powder, sometimes sillimanite, andalusite and kyanite fine powders are also added. The bonging phase are mainly mullite, with low glass phase. In mullite bonded SiC bricks, SiC content is between 65%~85%, sintering temperature is between 1350~1500℃. Mullite bonded SiC bricks have significantly better high temperature performance than clay bonded SiC bricks. Mullite bonded SiC bricks are widely used in ceramic industry, nonferrous metals industry, machinery industry and so on.

Silica Bonded Silicon Carbide Bricks

SiO2 bonded SiC bricks has far better high temperature performance than clay bonded SiC refractory, high temperature modulus of rupture is higher than mullite bonded SiC refractory. Silica bonded SiC bricks are mainly used as kiln furniture.

Oxide Bonded SiC Refractory Physiochemical Index

Jun 30, 2021

Silicon Nitride Brick

Si3N4 Bonded SiC Bricks Characteristics

Low apparent porosity.
Excellent high temperature mechanical strength.
Good high temperature creep resistance, at 0.2 Mpa load condition, RUL beginning temperature is higher than 1800℃.
High modulus of rupture.
Good thermal conductivity.
Very high alkali corrosion resistance.
Excellent oxidization resistance.
Prominent thermal shock resistance.
Excellent slag corrosion resistance.
Have strong cryolite corrosion resistance , ZnO corrosion resistance and electrolyte permeation resistance.

Si3N4 Bonded SiC Bricks Physiochemical Index

Si3N4 Bonded SiC Bricks Application

Si3N4 bonded SiC refractories are widely used in steel industry, nonferrous metals industry, ceramics industry and so on. Blast furnace refractory materials corrosion reasons include: alkali corrosion, CO, Zn, SiO and water vapor oxidization, abrasion, low thermal conductivity, thermal shock and slag corrosion. In light of this condition, Si3N4 bonded SiC bricks are the ideal products for blast furnace inner lining. The service life of silicon nitride bonded silicon carbide bricks inner lining can reach to 10~15 years. It is the first choice of large scale blast furnace inner lining refractory material.

SiN4 bonded SiC refractory is the best choice of new generation aluminum reduction cell inner lining. It can decrease horizontal electric current, increase side part heat diffusion, decline cell temperature, enhance electric current efficiency and save energy. Besides, the service life of aluminum reduction cell is greatly prolonged. SiN4 bonded SiC bricks have good thermal conductivity, cryolite corrosion resistance, oxidization resistance and scouring resistance. During using, SiN4 bonded SiC bricks inner lining can form a thick and stable protective layer, which in turn effectively prolongs the service life of aluminum electrolysis cell.

Si3N4 bonded SiC bricks are also used as kiln furniture of ceramic kilns.

Jun 30, 2021

Graphite Brick

Graphite Brick Properties:

1. The graphite brick has good chemical stability, anti-sourcing, wear resistance, low porosity, good decay resistance.
2. Its quality and volume are constant, heat conduction and high temperature resistance,it will not explode and damage due to sharp temperature change.
3. During construction, it does not pollute the medium, will not cover the impurity spots, and is easy to clean. The heat transfer effect will not be reduced for long time, and the curing process is excellent. It is especially suitable for equipment corrosion protection in strong corrosive medium.
4. The thermal expansion coefficient is small, the line change rate is low, it is used within the range of 180 degrees, and its performance is stable and the durability is strong.

Graphite Blocks Manufacturing Process:

Carbon graphite blocks are made of carbon graphite materials. They are manufactured in the process of graphitization in the electric furnace at high temperature about 2500-2800℃. The main raw material of the graphite blocks is calcined anthracite, and the binder is pitch. Such products are produced through forming, high temperature baking, and final precision machining.

Application of Graphite Brick:

Graphite block can be used in the lining of reactive tank, storage tank, and the autoclave used in the chemical industry. Besides, graphite brick can be used in the bottom of the blast furnace.