Rongsheng Refractory Factory

Author: zzrsrefractories.com

  • Clay Insulation Bricks

    Clay Insulation Brick Properties

    High porosity, usually 40%~85%.
    The low volume density, the low volume density is lower than 1.5g/cm3
    Low thermal conductivity, generally less than 1.0W (m.K)
    As the insulation material of industrial kiln, it can reduce heat loss, save energy, and reduce the quality of thermal equipment.

    Clay Insulation Brick Physical & Chemical Index

    Items RS-0.8 RS-1.0 RS-1.3 RS-1.5
    Maximum Service Temperature 1280 1300 1350 1400
    Bulk Density，g/cm3 0.8 1.0 1.3 1.5
    Apparent Porosity， % 60 55 50 40
    Cold Crushing Strength  (Mpa) ≥ 2.5 3.0 4.0 6.0
    Reheating Linear Change (%)℃×12h ≤ 1350℃  -0.5 1350℃  -0.9 1350℃  -0.9 1350℃  -0.9
    Thermal conductivity  W/(m·K) 600℃ 0.45 0.43 0.61 0.71
    800℃ 0.50 0.44 0.67 0.77
    Al2O3 40 40 40 42
    SiO2 1.5 1.5 2 2
    Fe2O3 55 55 55 55

    Clay Insulation Brick Application

    Furnaces of metallurgy industry, heat treatment furnace
    Furnaces of chemical industry and construction industry.
    Furnace of incineration of garbage, recirculating fluidized bed furnace

  • Silica Insulation Bricks

    Feature of Light Weight Silica Insulation Bricks:

    1.Low bulk density,
    2.Low thermal conductivity,
    3.High apparent porosity,
    4.Good thermal shock resistance,
    5.Great high-temperature mechanical strength,
    6.High-temperature stable volume change,
    7.Strong acid slag erosion resistance.

    Application of Light Weight Silica Insulation Brick

    Lightweight silica brick is mainly used to preserve heat in the glass industry, iron&steel industry, and ceramic furnaces. The main applications are the low-temperature parts such as blast furnaces and hot blast furnaces, waste incinerators, and glass melting furnaces.

    Light Weight Silica Insulation Brick Description

    Items QG-1.0 QG-1.1 QG-1.15 QG-1.2 Items
    SiO2  % ≥91 ≥91 ≥91 ≥91 SiO2  %
    Bulk Density  g/cm3 ≥1.00 ≥1.10 ≥1.15 ≥1.20 Bulk Density  g/cm3
    Cold Crushing Strength  MPa ≥2.0 ≥3.0 ≥5.0 ≥5.0 Cold Crushing Strength  MPa
    0.1Mpa Refractoriness Under Load   °C ≥1400 ≥1420 ≥1500 ≥1520 0.1Mpa Refractoriness Under Load   °C
    Reheating Linear Change (%) 1450°C×2h 0~+0.5 0~+0.5 0~+0.5 0~+0.5 Reheating Linear Change (%) 1450°C×2h
    20-1000°C Thermal Expansion Coefficient ×10-6℃-1 1.3 1.3 1.3 1.3 20-1000°C Thermal Expansion Coefficient ×10-6℃-1
    Thermal Conductivity  (W/(m·K)  350°C±10℃ ≤0.55 ≤0.6 ≤0.65 ≤0.7 Thermal Conductivity  (W/(m·K)  350°C±10℃

  • Alumina Bubble Brick

    To make alumina bubble insulating bricks, different diameters of alumina bubbles are proportionally blended, then the proper ratio of binders, such as phosphate or aluminum phosphate are added into the raw material, after mixing, pre-sintered fine powders are added into the raw material, and mixed together, so the binders and fine powders can even be distributed on the surface of alumina bubbles. Through vibration molding and drying, the green alumina bubble bricks are sintered at a 1500℃ high temperature. Because the large diameter bubbles have lower mechanical strength, they are easy to crack during molding, the max. the diameter should not exceed 5mm. But small diameter bubbles and fine powders proportion should not too high, too, because the bulk density and thermal conductivity will significantly increase. Sintering temperature also has a great influence on alumina bubble bricks, with the increase of sintering temperature, the sintering degree is increased, and thermal conductivity increases accordingly.

    By mineral composition and structure, alumina bubble bricks are divided into pure alumina bubble insulating bricks, mullite bonded alumina bubble bricks, Sialon bonded alumina bubble bricks, and so on. For mullite bonded alumina bubble insulating bricks, some ratio of SiO2 powder is added into powder material, during sintering, some quantity of mullite is formed in the matrix to replace the corundum phase, so the thermal shock resistance of alumina bubble insulating bricks is improved.

    During the high-temperature nitridation sintering of Sialon bonded alumina bubble bricks, the matrix has a nitridation reaction and forms Sialoon bonded matrix phase. Sialon bonded alumina bubble bricks have high mechanical strength, good thermal shock resistance, strong corrosion-resistance, and so on.

    Item LKZ-88 LKZ-99 Sialon bonded alumina bubble insulating brick Zirconia bubble insulating brick
    Al2O3 % ≥88 ≥99 ≥70 /
    ZrO2 % / / / ≥98
    SiO2 % / ≤0.2 / ≤0.2
    Fe2O3 % ≤0.3 ≤0.15 N≥5 ≤0.2
    Bulk density g/cm3 1.30~1.45 1.45~1.65 ≤1.5 ≤3.0
    Cold crushing strength Mpa 10 9 15 8
    Refractoriness under load (0.2Mpa, 0.6%) 1650 1700 1700 1700
    Reheating linear change rate % ±0.3 ±0.3 / ±0.2
    Linear expansion coefficient /℃-1 8.0*10-6 8.6*10-6 Thermal shock resistance ≥5（1100℃, water cooling） /
    Thermal conductivity /W(m·K)-1 <0.9 <1.0 <1.1 <0.5
    Max. working temperature ℃ 1650 1800 1600 2000~2200

    Alumina bubble insulating bricks applications

    Compared with other lightweight insulating materials, alumina bubble insulating bricks have the advantages of high working temperature, high mechanical strength, low thermal conductivity. Their bulk density is 50%~60 lower than that of the same composition dense refractory bricks. Alumina bubble bricks can endure high-temperature flame impact and can be used as the inner lining of high-temperature kilns and furnaces, the main applications of alumina bubble bricks are Molybdenum silicide electric furnace, molybdenum wire furnace, tungsten furnace, high-temperature gas intermittent kiln, tunnel kiln, and so on, the energy consumption is saved by at least 20%.

  • 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

    Index   RS-65 RS-70
    Mgo % ≥ 10 10
    Al2O3 % ≥ 65 70
    C % ≥ 7 7
    Bulk Density g/cm3 ≥ 2.95 2.95
    Apparent Porosity %≤ 8 8
    Cold Crushing Strength Mpa≥ 40 40

    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.

  • 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

    Item Clay bonded SiC refractory Mullite bonded SiC refractory SiO2 bonded SiC refractory SiO2 bonded SiC refractory
    Bulk density g/cm3 2.5 / 2.70~2.75 2.78
    Apparent porosity % 14~18 14~16 7~8 5.8
    Cold crushing strength Mpa 100 / 130 150
    Modulus of rupture Mpa(1400℃) 13 24~26 / 30~50
    Linear expansion coefficient ℃-1 4.6*10-6 / 4.9*10-6 4.8*10-6
    Thermal conductivity W·(m·K)-1(1000℃) 11 / 15.7~16.9 16.2（1000℃）
    SiC % >85 >70 ≥90 89.8
    SiO2 % / / / 8.9
    Al2O3 % / / / 0.5
    Fe2O3 % / / / 0.5

  • 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

    Item Si3N4 bonded SiC brick Sialon bonded SiC brick Fine Si3N4 bonded SiC brick
    SiC % 75.04 73.54 66~80
    Si3N4 % 22.18 / 20~30
    Al2O3 % 0.37 / /
    Fe2O3 % 0.27 0.32 /
    Bulk density g/cm3 2.73 2.72 2.80
    Apparent porosity % 13.3 14 ≤11
    Cold crushing strength Mpa 229 220 580
    Modulus of rupture Mpa（1400℃） 65.2 56.7 180 (1200℃)
    Linear expansion coefficient ℃-1 (20~1000℃) 4.5*10-6 4.7*10-6 4.4*10-6
    Thermal conductivity w·（m·K）-1 1000℃ 18.4 18.2 /

    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.