Fused Zirconia-Corundum Bricks

Fused Cast Zirconia-Alumina Refractory Brick

Fused cast Zirconia-Corundum brick (AZS brick), also known as fused cast zirconia-alumina brick, is a high-quality refractory product made from industrial alumina powder and selected zircon sand as main raw materials. It is produced by melting the materials in an electric arc furnace at 1800-1900℃, casting the mixture, and then annealing and cooling it. The product name AZS comes from the abbreviation of its three main chemical components: Al₂O₃ (A), ZrO₂ (Z), and SiO₂ (S).

The product mainly consists of a eutectic of corundum (α-Al₂O₃) and zircon (ZrO₂), as well as a glassy phase filling the crystal spaces. It possesses excellent properties such as dense structure, low porosity, strong resistance to glass melt erosion, and minimal contamination of the glass melt. Based on the zirconium oxide content, it is divided into three grades: AZS-33#, AZS-36#, and AZS-41#. Based on the casting method, it is divided into four types: ordinary casting (PT), inclined casting (QX), quasi-shrinkage-free casting (ZWS), and shrinkage-free casting (WS), which can meet the differentiated needs of different parts of the glass melting furnace.

Product Features

1. Excellent Resistance to Molten Glass Erosion

Taking AZS-41# as an example, the erosion rate is ≤1.3mm/24h (1500℃×36h, ordinary soda-lime glass). The higher the zircon content in the product, the denser the formed zircon-rich layer, and the stronger the erosion resistance.

2. Minimal Contamination of Molten Glass

Utilizing an oxidation melting process, there is almost no carbon contamination, and the bubble precipitation rate is low (AZS-41#≤1.0%). Suitable for high-quality glass melting furnaces such as those for electronic glass and photovoltaic glass.

3. Dense Structure and Extremely Low Porosity

Apparent porosity ≤1.0~1.2%, bulk density ≥3.75~3.95g/cm³, effectively preventing molten glass penetration.

4. High-Temperature Structural Stability

Initial glass phase precipitation temperature ≥1400℃, load softening temperature ≥1700℃, excellent creep resistance at high temperatures.

5. Refractoriness > 1700℃

Suitable for key parts of various ultra-high temperature thermal equipment.

Item	AZS33-Y	AZS36-Y	AZS41-Y
Bulk Density / (g/cm³) ≥	3.75	3.80	3.95
Apparent Porosity / % ≤	1.5	1.0	1.0
Corrosion Resistance to Glass Melt (Soda-lime glass, 1500℃×36h) / (mm/24h) ≤	1.60	1.50	1.30
Glass Phase Exudation Temperature / ℃ ≥	1400	1400	1400
Blister Rate (Soda-lime glass, 1300℃×10h) / % ≤	2.0	1.5	1.0
Glass Phase Exudation Amount (1500℃×4h) / % ≤	2.0	3.0	3.0

Measured Data

Item	AZS33-Y	AZS36-Y	AZS41-Y
PT, QX >	3400	3450	3550
ZWS >	3600	3700	3850
WS >	3700	3750	3900

Note: Applicable to products with a single weight greater than 50 kg.

Application Areas

• Key Components of Glass Melting Furnaces: Pool walls (36# or 41# recommended for hot spots), feed inlet corners (41#), flow channels (WS type), furnace sills, pool wall corners, lining, and other areas most susceptible to corrosion.
• All-Electric Melting Furnaces: All-electric glass melting furnaces used for applications requiring extremely high corrosion resistance and low pollution levels.
• High-Quality Glass Production: Melting furnaces for float glass, photovoltaic glass, electronic glass, borosilicate glass, and other specialty glasses.
• Other High-Temperature Industries: High-temperature critical components such as metallurgical ladle slides and chemical gasification furnace linings.

Company Profile

A professional enterprise specializing in heat treatment technology services and the R&D, manufacturing, and sales of high-temperature electric furnaces.

The company focuses on developing high-temperature electric furnaces covering a full temperature range of -100℃ to 2600℃. Its products include experimental electric furnaces, vacuum atmosphere furnaces, industrial kilns, and medium-frequency induction heating equipment. Main products include box furnaces, tube furnaces, lifting furnaces, pusher kilns, bogie furnaces, rotary kilns, tunnel kilns, and various specialized medium-frequency furnaces.

The company adheres to technological innovation and has passed ISO9001 and EU CE certifications. It owns 21 registered trademarks, 29 patents, and 27 software copyrights.

Payment Methods

TT

Shipment Methods

The electric furnace is packaged in thThe electric furnace is packaged in three layers: first wrapped in foam paper, then wrapped in plastic film, and finally packed in a wooden crat.

Frequently Asked Questions (FAQ)

1. How to choose between grades 33#, 36#, and 41#?

Select the grade based on the glass furnace operating conditions and usage requirements. 33# has the lowest zirconium content, offering high cost-effectiveness, and is suitable for general parts such as the upper structure; 36# has an even lower glass phase content, suitable for high-requirement parts such as hot spots on the furnace walls; 41# has the highest zirconium content (40~44%), offering the strongest erosion resistance and the lowest bubble precipitation rate, specifically designed for the most demanding core and critical parts such as flow channels and furnace sills.

2. What are the differences between the four casting methods: PT, QX, ZWS, and WS?

PT is ordinary casting, with shrinkage cavities located below the casting port, suitable for non-critical parts; QX is inclined casting, with shrinkage cavities offset at the lower end, mainly used for furnace wall bricks; ZWS is quasi-shrinkage-cavity-free casting, essentially eliminating shrinkage cavities, resulting in high density; WS is shrinkage-cavity-free casting, completely eliminating shrinkage cavities, resulting in the densest material, used for the most severely eroded parts such as flow channels and furnace sills.

3. What precautions should be taken when using fused zirconia-corundum bricks?

It should be noted that ZrO₂ undergoes a phase transformation and volume change around 1000℃. Strict thermal regimes must be followed during installation and furnace drying. Additionally, during installation, ensure that the direction of the shrinkage cavities is perpendicular to the eroded surface of the molten glass to extend service life.

4. Does the product support customization?

Yes. Fused zirconia-corundum bricks of different shapes and sizes can be customized according to customer drawings. Please contact our sales engineers for details.