Zircon Mullite Refractory Brick for Dry Quenching
The decription:
Zirconium mullite brick is a fused cast refractory product with mullite and zirconia as raw materials.
Zirconium mullite cast brick has dense crystal structure, high softening temperature under load, good thermal stability, high mechanical strength at room temperature and high temperature, good wear resistance, good thermal conductivity, and excellent resistance to erosion
Sintered zircon mullite brick is a general sintered AZS product containing zircon, which is made by sintering (or electric melting) mullite or corundum calcined bauxite coarse particles and zircon stone in arbitrary proportion, plus binder firing. The firing temperature of 1 degree determines the total decomposition of zircon particles, slight decomposition of the surface or no decomposition at all.
Sintered zirconium mullite refractory has good high temperature resistance and corrosion resistance.
However, in the temperature range of ZrO2 phase transition, it is sensitive to thermal shock.
A1203—
The introduction of ZrO2 into SiO2 bricks to improve the structure of mullite, can improve the chemical erosion resistance of mullite, heat resistance and reduce the coefficient of expansion, this ZrO2 containing 1 mullite brick, known as zirconium mullite brick, is generally obtained by electric melting method, but also useful sintering method production..
Sintered zirconium mullite brick is a special refractory made by using industrial alumina and zircon concentrate as raw materials and introducing zirconia into mullite matrix by reaction sintering process..
The high temperature mechanical properties of mullite can be greatly improved by introducing zirconia into mullite brick and using the phase transformation toughening of zirconia.
Zirconia can promote the sintering of mullite material, and the addition of ZrO2 can accelerate the densification sintering process of ZTM material due to the production of low melting point and the formation of vacancy.
When the mass fraction of ZrO2 is 30%1, the relative theoretical density, strength and toughness of the billet sintered at 1530ºC reach 98%, 378MPa and 4.3MPa&bull respectively.
The 1 zirconium mullite brick made by reaction sintering with industrial alumina and zircon as raw materials is difficult to control due to the simultaneous reaction and sintering.
Usually, the sintering is first held at 1450 ° C to densify it, and then heated to 1600 ° C for reaction,
ZrSiO4 is decomposed into ZrO2 and SiO2 when 1 is greater than 1535ºC, and SiO2 reacts with Al203 to produce mullite. A part of the liquid phase appears when ZrSiO4 is decomposed, and the decomposition of ZrSiO4 can refine the particles and increase the specific surface area, thus promoting sintering.
The results show that when the addition of zircon is less than 54.7%, the microstructure of the sintered sample gradually changes from columnar corundum to columnar mullite with the increase of zircon content.
The high temperature bending strength (1400, C) of the sample also increases with the increase of zirconia content, and a large value appears when the zirconia content is 23.7%, and then the strength decreases.
The addition of zircon 1 contributes to the improvement of thermal shock resistance.
The Physcial and Chemcial Index of Zircon Mullite Refractory Brick for Electrothermal Furnace
| Item |
Dense Zircon brick |
Zircon brick |
Zircon Corundum brick |
Zircon Mullite brick |
Semi-Zircon brick |
| ZrO2 % ≤ |
65 |
60 |
30 |
18 |
15-20 |
| Al2O3 % |
--- |
--- |
50 |
55 |
50-60 |
| SiO2 ≤ |
--- |
38 |
18 |
25 |
20 |
| Fe2O3 % ≤ |
0.3 |
0.5 |
0.5 |
0.5 |
1.0 |
| Apparent porosity % ≤ |
18 |
22 |
20 |
17 |
20 |
| Density kg/m3 |
3.7 |
3.5 |
3.2-3.3 |
2.7 |
2.7 |
| CCS Mpa |
100 |
100 |
100 |
100 |
100 |
| RUL ºC ≥ |
1650 |
1620 |
1650 |
1650 |
1550 |
Characteristics of zirconium mullite brick:
1. Resistance to glass and alkali erosion, anti-erosion
2. High mechanical strength, good thermal shock stability
3. Reburning shrinkage and high temperature creep becomes smaller
4. Dense crystal structure
Application:
Zirconium mullites brick application: mainly used for glass melting part of the bottom, cooling part of the bottom, small furnace, regenerator cell lattice, L-shaped hanging wall nose area, etc.
It is an indispensable key supporting material for a wide range of applications in large float glass kilns.
Used in large glass kiln melting pool, picture tube kiln, regenerator wall brick and chemical, metallurgical industrial kiln by solution erosion parts.
Company main products and profile:
Why choose us?
Zhengzhou Kaiyuan Refractories Co., Ltd is a manufacturer of silicon-aluminum refractory (fireclay brick, high alumina brick, silica brick, mullite brick, corundum brick, insulation brick, castable, mortar) for coke oven, blast furnace, hot blast stove, heating furnace, anode baking furnace, boilers and other industrial furnaces for 20 years located in Henan, China.
Our total annual production capacity is about 100,000 tons of dense-shaped refractory product, and 100,000 tons of monolithic refractory product.
We have three tunnel kilns for silicon-aluminum dense bricks and one new plant for the monolithic refractory.
We're sure our custom-made products and professional services will bring you a stable quality supply and more profit.
Our Laboratory and R&D Center
We have test equipment for the following items:
chemical %
bulk density
apparent porosity
cold crushing strength
modulus of rupture
refractoriness under load
creep
thermal expansion
Reheat linear change
thermal shock resistance
thermal conductivity
Contract Kiln Construction
FAQ
1. Are you a Manufacturer or trader?
A: We are manufacturer and our plant is located in Xinmi city, Henan, China
2. Can we visit your company?
A: You are warmly welcome to visit our company at anytime, you'll not regret of the visiting.
3. Do you accept OEM?
A: Yes, we do OEM.
4. What's the MOQ of trial order?
A: We care about all the potential customers and take all the trails orders.
5. What is the payment term?
A: TT, LC, DP, DA.
6. How long is the delivery time?
A: Usually within 35 days after down payment.
7. Do you accept third party inspection ?
A: Yes for sure, we accept the third party inspection before delivery.
8. What is your after-sell service?
A: The rejected goods can be replaced or we can make compensation for it. We can send technical engineers to the end user for technical issue.
9.What is your company's certification?
A: ISO9001 certificate
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