Al2O3 Content % 46% Antistripping Refractory Brick for Glass Furnace Construction

  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.

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 

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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.