AZS brick is also called fused cast zirconia corundum brick or AZS refractory brick, which is abbreviation of zirconia corundum refractory brick. It is a kind of white solid, made by pure alumina powders and zircon sands; all of them are injected into mold for cooling after melting in the electric furnace. The facies structure of AZS refractories brick consists of eutectoids and glass phases of corundum and zircon slant, which are eutectoids of corundum phase and zircon slant phase from the phase learning, and glass phase is filled between their crystals. AZS brick is generally used as glass furnace’s wall. So if you have any needs or questions, welcome to contact us for free quotation.
What’s AZS Brick?
AZS brick is also called fused cast zirconia corundum brick or AZS refractory brick, which is abbreviation of zirconia corundum refractory brick because of containing Al2O3-ZrO2-SiO2. AZS block is made from pure alumina powder and zircon sand (composed of 65% zirconia and 34% SiO2). After Alumina powder and zircon sand melting in electric furnace, they are cast into various molds and cool themselves down to become white solid.
AZS Block Casting Methods
After the raw material of manufacturing AZS blocks is completely melted and cast in a mold, AZS block is formed by cooling and solidification. During the condensation process of it, shrinkage cavities caused by volume shrinkage should be concerned particularly when used. The casting methods of AZS blocks is ordinary casting, tilt casting, no shrinkage cavity casting and quasi-non-shrinkage cavity casting. The following chart is it’s casting methods.
|PT||Qrdinary Casting||The shrinkage hole of AZS block is located at the lower part of the casting port, and is mostly used for the portion where the upper structure of the melting pool is not seriously eroded|
|QX||Tilt Casting||The shrinkage hole of AZS block is offset from the lower end and is mainly used as a wall brick|
|WS||No Shrinkage Cavity Casting||Mainly used for fluid erosion, kiln, pool wall corners, paving and other areas of severe erosion|
|ZWS||Quasi-non-shrinkage Cavity Casting||Mainly used as pool wall bricks|
Fused Cast AZS Manufacturing Process
The manufacturing process of fused cast AZS is to mix selected zircon sand and industrial alumina powder in accordance with 1:1, plus a small amount of Na2O (added in the form of sodium carbonate), B2O3 (added in the form of boric acid or borax) flux, then mixed evenly, casting molding after melting under the temperature of 1800℃~1900℃. Finally, we can obtain casting bricks in possession of ZrO2 33%.
On this basis, the cast bricks containing ZrO2 (36%~41%) can be made by using partially desiliconized zircon sand as raw material. Meanwhile, fused cast zirconia corundum brick is a kind of refractory product with ZrO2 content as 33%~45%, using industrial alumina powder and selected zircon sand as raw material.
Fused Cast AZS Raw Material
The performance of fused cast AZS depends on the quality of raw materials and its production process, especially the quality of primary raw materials, which directly affects the features of fused cast zirconia corundum brick.
AZS Refractory Brick Properties
AZS refractory brick is featured with high temperature resistance and erosion resistance. It has the following characteristics:
- Good erosion resistibility
- Compact microstructure
- Good thermal shock resistibility
- High compression resistance
- Barely rendering blister
- A variety of formats and shapes for furnace different working areas
AZS Refractory Brick Classification
AZS refractory brick can be divided into three types AZS—33, AZS—36 and AZS—41 because the content of zirconia is different. We can also tell them from their physical and chemical index.
Fused Cast Zirconia Corundum Brick Specification
|Physical and Chemical Index of AZS Bricks|
|Item/Product||33#RS AZS Brick||36#RS AZS Brick||41#RS AZS Brick|
|Cold Crushing Strength(MPa)||350||350||350|
|Thermal Expansion Rate (%)||0.8||0.8||0.8|
|Glass Phase Bleed Temperature (℃)||>1400||>1400||>1410|
|Resistance to Glass Erosion (1500℃36H, Ordinary Glass)||≤1.4||≤1.3||≤1.2|
|Heavy Capacity||Ordinary Casting
|No shrinkage cavity casting
|Refractoriness Under Load (<0.2MPa) ℃||>1700||>1700||>1700|
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AZS Block for Glass Furnace
Nowadays, AZS refractory block is the main building material of glass industry kiln. It has the characteristics of high temperature resistance and erosion resistance. We also know that AZS blocks has three types, so different AZS refractory blocks can be applied in the different parts of glass furnace.
- 33#AZS brick is particularly superiority in preventing contamination of the glass, and its tendency to cause stones, bubbles and basic glass phases to precipitate in the glass is small. It is suitable for the upper structure of melting pool, the pool walls of working pool, paving bricks and material channel.
- 36#AZS brick is a standard oxidation fused zirconia corundum brick, which has a special high resistance to glass erosion and low staining, and the performance in these two aspects is balanced. It is suitable for the position which can direct contact with glass liquid in glass furnace, such as the pool wall brick, paving brick, feeding port and so on.
- 41#AZS brick is the most advanced oxidized fused zirconia corundum brick with the highest resistance to glass erosion and outstanding low contamination of glass. It is suitable for the parts that require high corrosion resistance in glass kiln, such as all-electric melting furnace, fluid hole, kiln, bubbling brick, brick at the corner of the feeding port,etc.
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