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AZS Brick

Product: AZS (alumina-zirconia-silica) refractories/electro Zircon corundum brick

Category:  Fused Cast Refractories

Application:  Glass industry

Item Code:  AZS-33#, AZS-36#, AZS-41#

What is AZS refractory?

AZS refractory or AZS brick, electrofused AZS is an important type of refractory product to build and ensure the normal operation of glass furnaces. This type of refractory brick is a good material for resisting erosion where it is in direct contact with molten metal and slag. It is an indispensable material for the key parts of the glass kiln that are most severely corroded. It is also effective in areas severely corroded by slag in metal smelting furnaces and containers.

AZS is the short form of alumina-zirconia-silica, which is arranged in the order of their content. It is also known as fused cast zirconium corundum brick because of the manufacturing method. Its main chemical components are alumina (Al2O3), zirconium oxide (ZrO2), and silicon oxide (SiO2).

AZS refractory application

AZS refractory brick has the characteristics of high density, high hardness, high heat resistance, corrosion resistance, etc. It can withstand high temperatures and chemical-eroding environments. It is widely used in the internal structure of glass industrial furnaces. The selection of the right AZS refractory brick is critical for the quality of the glass and the lifespan of the furnace.

AZS refractory products

AGRM fused cast AZS brick series AZS-33#, AZS-36#, and AZS-41# are divided based on zirconium content. For example, AZS-33# stands for 33% of zirconium content. The higher content of zirconium means higher corrosion resistance. They are installed in different parts of the glass furnaces according to their performance in resisting high temperatures, molten glass, temperature, etc., physical impacts, chemical erosion, and thermal effects.

AZS-36# is added with more chain-shaped zirconia crystals and a lower glass phase content. The corrosion resistance of 36# fused zirconium corundum bricks is further enhanced, so it is suitable for areas with fast glass flow rates or high temperatures.

In addition to the eutectic of silicon oxide and alumina, the AZS41# fused zirconium corundum brick also contains more uniformly distributed zirconium oxide crystals. The highest content of zirconium makes AZS-41# the most erosion-resistant of the three types. It is suitable for building the key parts of the glass melting furnace. Because it has extremely high resistance to glass liquid, low potential for exudation, and extremely low contamination of glass liquid.

AZS-33#

Based on casting type and density, AZS-33# can be used in small furnace tops, working pools, feeding channels, non-glass contact zones, pool walls, and side walls. 

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AZS-36#

It can be used in small furnace tops, working pools, feeding channels, non-glass contact zones, pool walls, side walls, bottoms, and special shapes.

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AZS-41#

It can be used in pool walls, fluid holes, feeding corners, and special shapes.

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Physical And Chemical Indicators of AZS brick

ItemA1101A1102A1103
Al2O³Margin
ZrO232.5%-34.0%35.5%-37.0%40.0%-42.0%
Na2O1.5%1.6%1.3%
Fe2O3+TiO2+CaO+MgO +Na2O+K2O+B2O33%2.5%2.5%
SiO216%14%13%
Fe2O3+TiO20.3%0.3%0.3%

Typical crystallographic analysis

ItemA1101A1102A1103
B.D Densified Section3.7g/cm³3.75g/cm³3.9g/cm³
A.P Densified Section2%1.5%1.3%
Static Corrosion (Soda-lime Glass, 1500 x 36h)1.6mm/24h1.5mm/24h1.3mm/24h
Exudation Temperature1400℃1400℃1400℃
Bubbling Rate (Soda-lime Glass, 1300°C*10h)2%1.5%1%
Glass Phase Seepage Quantity (1500°C x 4 hours)Provide the Measured Data
The Coefficient of Thermal Expansion (1000°C)Provide the Measured Data

AZS brick Casting Modes

Below is the naming method in China. Factories in different countries have different naming methods. In general conditions, naming methods among different countries can be matched with each other.

CodeCasting ModesCharacteristics and Application
PTRegular Castnormal cast mode with the shrinkage voids beneath the casting scar.
It is widely used on top parts and other parts that are not seriously eroded in the melter.
QX Tilt CastTilt cast causes the shrinkage voids to be concentrated towards the bottom of blocks. It is mainly used on sidewall blocks of melters.
WSVoid FreeThe voids are all removed. Mainly used on the throat, threshold, sidewall corner, pave, and other seriously eroded parts.
ZWS       End CutIt is similar to WS, and the voids are mostly removed. ZWS is normally used on melter sidewall blocks.

Volume Weight

ItemA1101A1102A1103
PT,QX3.4g/cm³3.45g/cm³3.55g/cm³
ZWS3.65g/cm³3.75g/cm³3.85g/cm³
WS3.7g/cm³3.8g/cm³3.9g/cm³

Note: The data on volume weight is suitable for products that are heavier than 50kg.

Advantages of AZS refractory from AGRM

Extreme chemical stability

Due to the dense microstructure, the brick is not easy to be affected and change property by the molten glass. There are fewer stones and other defects.

High-temperature resistance

As the lining material of glass furnaces and other kilns, the azs brick can run for a long time at high temperatures without deformation, cracking, etc.

High resistance to corrosive chemical

The appropriate content of ZrO2 and glass phase enables the brick to have strong resistance to corrosion from alkaline mediums, especially molten glass.

Low coefficient of thermal expansion

The brick has good thermal shock resistibility, which is critical to the solidification sequence, solidification percentage, solidification time, temperature gradients, and probabilities of macro-defects.

Barely contaminate

The excellent performance brings barely any contamination to the contact material, thus ensuring the quality of the glass.

Low potential of blistering and exudation

The possibility of exudation is low, which means the corrosion rate of brick is lowered and glass pollution is avoided to the greatest extent. A low blistering rate guarantees the glass quality.

The manufacturing process of AZS brick

Fused cast AZS with 33% of ZrO2 are produced by batching well-chosen zircon sand and industrial alumina powder in a certain ratio. Additives include a small amount of NaZO (added in the form of sodium carbonate) plus B2O as a flux source (in the form of boric acid or borax). All the materials are well mixed, melting, and casting under 1800℃~1900℃. On this basis, by adding partially de-siliconized zirconium as a raw material, fused cast bricks containing 36% to 41% ZrO2 can be produced. Their petrographic structure is composed of eutectoid and glass phases of corundum and baddeleyite. From the perspective of phase, it is the eutectoid of the corundum phase and baddeleyite phase, and the vitreous phase is filled among their crystals.

AGRM special services

Special-shaped refractory bricks manufacturing

Besides the normal size of refractory bricks, AGRM is especially good at providing special-shaped refractories. We accept drawings from clients and can produce a precise finished product.

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Outsourced inspection service

We understand the concerns of clients when purchasing such critical industrial refractories. Outsourced inspection service is offered to clients who can’t make a pre-refractory inspection.

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