Zirconia-based refractory materials are fire-resistant products made from natural zircon sand (ZrSiO4). They belong to acidic refractories, characterized by strong slag resistance, small thermal expansion rate, decreasing thermal conductivity with increasing temperature, high load softening point, large wear resistance, and good thermal shock stability, making them important materials in various industrial fields.
Zirconia-based refractory materials include zircon bricks sintered from single zircon, as well as zircon bricks made from zircon as the primary raw material, mixed with appropriate bonding agents (refractory clay). To improve the performance of zircon bricks, other components such as high-alumina bauxite, fused alumina, or chromia may be added.
Zirconia-based refractories have good corrosion resistance, excellent wear resistance, slag resistance, and thermal shock resistance, along with a low thermal expansion coefficient. They are suitable for lining steel ladles, high-temperature induction furnace linings, and the bottoms of aluminum smelting furnaces. They can also be used in parts of glass tank furnaces that are prone to damage.
Key Features
High Melting Point: Zircon has a melting point of around 2550°C, capable of withstanding very high temperatures.
Excellent Thermal Shock Resistance: Can withstand rapid temperature changes without cracking easily.
Good Chemical Stability: Has excellent corrosion resistance to acids, alkalis, and other chemicals.
High Strength: Maintains good mechanical strength even at high temperatures.
Low Thermal Conductivity: Provides good thermal insulation, reducing heat loss.
Main Types
Dense Zirconia Refractory Materials:
Features: Made through a sintering process, with high density and strong resistance to wear and erosion.
Applications: Used in high-temperature metallurgical equipment, linings of glass melting furnaces, etc.
Castable Zirconia Refractory Materials:
Features: Formed by casting, with good plasticity, suitable for complex shapes.
Applications: Used in specific-shaped components of high-temperature equipment.
Pre-cast Zirconia Refractory Materials:
Features: Pre-made into specific shapes, convenient for installation and replacement.
Applications: Commonly used for furnace lining components requiring quick replacement.
Fused Zirconia Refractory Materials:
Features: Made through a fusion process, with higher density and purity, superior performance.
Applications: Suitable for high-temperature glass melting furnaces and other high-temperature molten metal processing equipment.
Application Fields
Metallurgical Industry: Used as linings for high-temperature smelting equipment of steel, aluminum, copper, and other metals, such as converters, aluminum electrolytic cells, etc.
Glass Industry: Applied to the linings of glass melting furnaces and high-temperature glass forming equipment, able to withstand corrosion by glass melt and high temperatures.
Ceramic Industry: Used in the linings of ceramic firing kilns, able to withstand temperature fluctuations during the high-temperature firing process of ceramics.
Chemical Industry: Used as linings for chemical equipment, with good corrosion resistance and high-temperature performance.
Precautions
Usage Environment: Ensure that the material's operating temperature and chemical environment comply with its design specifications, avoiding exceeding the upper limits of temperature resistance or chemical corrosion resistance.
Installation: Proper installation and maintenance can extend the service life of the material, avoiding premature damage caused by improper installation.
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