|
[China]
Trade Verify
Address: Group 4, Chuling Village, Chaohua Town, Zhengzhou, Henan, China
Contact name:Liu
Henan Hongtai Kiln Refractory Co.,Ltd. |
|
Verified Suppliers
|
|
|
The sintered zirconium corundum brick takes zirconium and alumina
as raw materials, and the ZrO2 content is generally less than
20%.The following solid phase reactions occur between zirconite and
alumina at 1400 ~ 1450℃ :
3 al2o3 + 2 zrsio4 - > 3 2 sio2, al2o3 + 2 zro2
The microstructures of mullite and plagioclase zircon (containing
part of T -ZrO2) were uniformly distributed.This irreversible
reaction is also called in situ reaction.The measured initial
reaction temperature is 1397℃.1400 ~ 1425℃ and 1500℃.According to
the research results of Sheng Xumin et al., the initial temperature
of the reaction was 1380℃, and mullite was formed.When the
temperature reaches 1400-1420 ℃, the volume effect of V+16.4% is:
1)The result-mullite + T-ZrO2 volume expands to V+13.87%;
2)The final volume effect is V+16.4% when T-ZrO2 → M-ZrO2 phase
change.
| Item | Sintered AZS | |
| Trademark | AZS-30 | AZS-33 |
| ZrO2 % | ≥30 | ≥33 |
| Al2O3 % | 48 | 48 |
| Fe2O3 % | ≤0.3 | ≤0.3 |
| SiO2 % | ≤22 | ≤19 |
| Bulk density g/cm3 | ≥3.0 | ≥3.2 |
| Apparent Porosity % | ≤18 | ≤17 |
| Cold crushing strength MPa | ≥100 | ≥100 |
| Refractoriness under load °C | ≥1680 | ≥1700 |
There are three main kinds of products in this series:
(1) Reaction-sintered AZS products are two-phase and uniformly
distributed microstructure composed of mullite and plagiozircon
(including part of T-ZR02).This irreversible reaction is also
called in situ reaction.The initial reaction temperature ranges
from 1370 ℃ to 1420℃.
(2) Recombination type AZS products, with electric fusion AZS as
raw material through crushing, forming and sintering.
(3) containing zirconium series products.This series of products
belong to the simplest process type of generalized sintering AZS --
sintering or electric fusion of mullite or corundum or calcined
coarse bauxite particles in any proportion to zirconite, adding a
small amount of bound clay or other binder.The sintering
temperature determines the total decomposition of the zirconite
particles, slight surface decomposition or no decomposition at
all.Zirconite is sintered at 1650℃ without any decomposition, but
the surface in contact with Al2O3 will decompose at less than
1500℃.
Preparation of sintered zirconium corundum bricks
The key problems in the preparation process of sintered AZS
products are as follows:
(1) Ensure the complete reaction of ZrSiO4 with Al2O3 and the dense
sintering to form a uniform mullite -(corundum)- clinker with a
glass phase content of less than 5%.
(2) Al2O3 + kaolin should conform to mullite composition.
(3) The particle size grading of the products is reasonable to
ensure the maximum bulk density.
(4) The products are fully fired and the ideal microstructure is
obtained.
It is very difficult to produce high quality sintered AZS products.
In a sense, the strict requirements of controlling the process flow
are no less than that of casting products.
1. Strong professional:
Our company has thirty years producing experience in refractory
products. Our manager will supervise on a various refractorys
production materials, process control, quality supervision and
package delivery, and ensure the products are 100% qualified.
2.Annual supply:
Our company has passed ISO9001 quality management system
certification and SGS certification. And the annual supply of
shaped and unshaped refractory product is 28, 800-35, 000
tons.
3.Export experiences:
Now we have gained a global sales network reaching Taiwan, Russia,
Korea, Vietnam, Pakistan, Bulgaria, French, India,
Egypt,Congo, Angola, South Africa, and so on.
4. Production equipment:
Production and testing equipments are new, complete and automated
or semi- automated. Such modern facilities and equipments have
provided the fine technical guarantee for the production and
testing.
5. Testing equipment:
Our company's testing equipments as follows:
High Temperature RUL Tester
Bulk Density Tester
The Pressure Tester
Refractoriness Tester
Our competitive Advantage:
1.Competitive Price. Make the products competitive in your market.
2.Quick Response:We promise quick response at the very first moment when we received your request. 3.Superior Customer Service:The company provides after sales service ensuring customer’s satisfactions,we believe in Long term partnership bringing loyalty.
4.We had been on this filed for many years and we have our own research team,the prouduction process could be concrolled strictly.
5.We have developed stable customer base overseas and kept long-term cooperation.
