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Jun 30, 2021
Silicon Carbide Mullite Bricks

Silicon Carbide Mullite Bricks Characteristics

Abrasion Resistance
SiC mullite brick’s principal phases are high rigidity SiC, mullite, and corundum, meanwhile, SiC mullite bricks have high structural density, its bulk density is between 2.7 and 3.0g/cm3. So SiC mullite bricks have good abrasion resistance. Silicon carbide mullite brick’s density, strength, and abrasion resistance are significantly better than high alumina bricks and magnesia alumina spinel bricks.

Spalling Resistance And Thermal Shock Resistance

SiC in silicon carbide mullite bricks has high thermal conductivity, small thermal expansion rate, so SiC carbide mullite bricks have good thermal stability, max. thermal shock times can reach 46 times(1100℃, water cooling).

Insulating Performance

Silicon carbide mullite brick’s thermal conductivity(≤2.3W·(m·K) is lower than spinel bricks, and thus has a better heat preservation effect.

High-Temperature Performance

SiC mullite brick’s refractoriness under load is above 1500℃, max. is 1690℃, can endure high-temperature impact and won’t soften or deform.

Silicon Carbide Mullite Bricks Physiochemical Index

Item GM1650 GM1600 GM1550 GM1680
Al2O3 % 63 60 57 63
SiO2+SiC % 30 30 30 30
Apparent porosity % 17 17 19 17
Cold crushing strength Mpa 85 90 90 100
Refractoriness under load ℃ (0.2Mpa) 1650 1600 1550 1680
Thermal shock resistance(11oo℃, water cooling) 10 10 12 13
Bulk density g/cm3 2.65 2.60 2.55 2.65
Cold abrasion resistance cm3 5 5 5 5
Thermal conductivity(w/m·k) 1.7 1.7 1.7 1.7

Silicon Carbide Mullite Bricks Application

Due to silicon carbide mullite brick’s good abrasion resistance, high refractoriness, and thermal shock resistance, it is popularly used in rotary cement kiln sintering zone, transition zone, and so on, where material rolling friction, high-temperature thermal stress, temperature fluctuation, and material corrosion are severe.

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Jun 30, 2021
High Alumina Insulation Bricks

Lightweight High Alumina Brick Production Process

The usually used production method of lightweight high alumina brick is the foaming method. Ground high alumina clinker, binders(such as chamotte), and foaming agent are proportionally mixed to prepare a slurry, then green lightweight high alumina bricks are produced by casting method, and sintered at 1350~1500℃ high temperature.

Lightweight High Alumina Bricks Characteristics

The bulk density of lightweight high alumina brick is between 0.4~1.35g/cm3, porosity is between 66%~73%.
Crushing strength is between 1.3~8.1Mpa, thermal conductivity is between 0.291~0.582W/(m·K)(350℃).

Lightweight high alumina brick has high refractoriness, good thermal shock resistance, and so on.

Lightweight High Alumina Bricks Physiochemical Indexes

Item QLZ-1.0 QLZ-0.9 QLZ-0.8 QLZ-0.7 QLZ-0.6 QLZ-0.4
Al2O3 % ≥48
Fe2O3 % ≤2.0
Bulk density g/cm3 ≤ 1.0 0.9 0.8 0.7 0.6 0.4
Cold crushing strength Mpa ≥ 3.9 3.4 2.9 2.5 2.0 0.8
Thermal conductivity W/(m·K)≤ 0.50 0.45 0.35 0.35 0.30 0.20

Lightweight High Alumina Bricks Applications

Lightweight high alumina bricks are usually used as high-temperature insulating lining of industrial kilns and furnaces. High-quality lightweight high alumina bricks can be directly used in working lining of industrial kilns, where contact with flame directly. But light high alumina brick is not suitable in places where molten slag corrosion exists. As lightweight high alumina bricks have good chemical stability at reduction atmosphere, so light high alumina bricks are usually used as insulating lining of kilns and furnaces which adopt H2 or CO as protection atmosphere. The max working temperature of high alumina brick is about 1350~1500℃, high purity lightweight corundum brick max. working temperature can reach 1650~1800℃.

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Jun 30, 2021
Mullite Insulation Bricks

The Classification of Mullite Insulation Bricks:

Mullite insulating brick can be divided into the heavy insulating bricks and light mullite bricks on the basis of different density, according to the different temperature, it can be divided into: 1350 mullite bricks, 1450 mullite bricks, 1550 mullite brick etc.

Performance and application of mullite insulation brick:

The refractoriness is high, can reach to more than 1790 degrees centigrade. The RUL is 1600~1700 degrees C. The compressive strength at normal temperature is 70 ~ 260MPa. The thermal shock resistance is good. There are two kinds of mullite bricks: sinterted mullite and fused mullite brick.

The Characteristics of Mullite Insulation Brick:

The main material of sintered mullite brick is high alumina bauxite as the main raw material, adding a small amount of clay or raw bauxite as binder, it is made by molding and sintering. Fused mullite brick with high bauxite, commercial alumina and refractory clay as raw material, adding charcoal or coke fines as a reducing agent, after molding, can adopt the reduction electrofusion method to manufacture. The crystallization of the electric cast mullite is larger than that of the sintered mullite, and the thermal shock resistance is better than that of the sintered product. Their high temperature performance mainly depends on the content of alumina oxide and the uniformity of the distribution of mullite and glass.

Application of Mullite Insualtion Bricks:

Mainly used for hot blast stove of blast furnace and furnace bottom and furnace, glass furnace regenerator, sintering kiln, petroleum cracking dead lining system.

The Manufacture of Mullite Insulation Bricks:

Zhengzhou Rongsheng Kiln Refractory Material Co., Ltd is specialized in producing and selling refractory material for many years, we have technical team with colorful experience and excellent production team, we provide technical supporting and kiln construction service, if you have demand for mullite insulation bricks, welcome to contact with we RS company.

Mullite Insulation Brick Specification:

Mullite Insulation Brick
Item/Index JM23 JM26 JM28 JM30 RS32
Al2O3 % 37 54 64 72 77
Fe2O3 % 1.0 0.9 0.8 0.7 0.5
 

Thermal Conductivity (w/m*k)

 400℃ 0.14 0.27 0.32 0.41 0.49
600℃ 0.16 0.29 0.34 0.43 0.5
800℃ 0.18 0.31 0.36 0.44 0.51
1000℃ 0.20 0.33 0.38 0.45 0.53
Classification Temperature (℃) 1260 1430 1540 1650 1760
Thermal Expansion 1000℃ (%) 0.5 0.7 0.8 0.9 1.1
Bulk Density (g/cm3) 0.55-0.62 0.78-0.8 0.88 1.03 1.25
Cold Crushing Strength (Mpa) 1.2 1.6 2.1 2.5 3.5
Modulus of Rupture (Mpa) 0.9 1.4 1.6 2.1 2.1
Reheating Linear Change (%)

CT-30℃*8H

 1230℃

-0.5

 1400℃

-0.5

 1510℃

-0.5

 1620℃

-0.9

 1730℃

-0.9
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Jun 30, 2021
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

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Jun 30, 2021
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℃
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Jun 30, 2021
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%.

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