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.

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High Temperature RUL Tester
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The Pressure Tester
Refractoriness Tester 

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