Magnesium Stabilized Zirconia Tundish nozzle

Zirconia (zirconium dioxide, ZrO₂) has a very high melting point (over 2,700°C) and excellent thermal stability, allowing it to withstand the extreme temperatures of molten steel without melting or degrading. The tundish nozzle is subjected to rapid heating and cooling cycles, which can cause materials to crack or fail due to thermal stress. Zirconia's high thermal shock resistance helps prevent cracking and deformation, extending the life of the nozzle.

Properties of Zirconia Tundish Nozzle

Zirconia has excellent resistance to corrosion and erosion from the molten metal and slag in the steelmaking process. This property helps prevent chemical reactions that could lead to contamination of the steel or degradation of the nozzle.

The wear resistance of zirconia ceramic is higher than that of other refractory materials. It maintains its structural integrity over time, even under abrasive conditions, which is essential for consistent control of molten metal flow through the nozzle.

Zirconia has low wettability by molten metals, meaning that it resists bonding with the molten steel, which helps reduce clogging of the nozzle and keeps the flow of metal consistent.

Zirconia-based ceramics can be engineered to have controlled porosity or be made impervious to gas, allowing customization of the nozzle's properties for different steelmaking requirements, such as gas purging or flow rate control.

Application of Zirconia Tundish Nozzle

The tundish nozzle refers to a functional device made of high-temperature structural ceramics installed at the bottom of the continuous casting tundish. Its main function is to maintain the static pressure of the molten steel in the tundish basically unchanged, and the molten steel flows into the crystallizer through the sizing nozzle. The crystallizer is cooled by large flow water to take away the heat released when the molten steel solidifies, so that the molten steel solidifies into a billet. The molten steel flows into the crystallizer evenly and stably through the sizing nozzle, which is a necessary condition to ensure the normal continuous casting. Therefore, the tundish nozzle must have good corrosion resistance and thermal stability, and clogging, falling off, cracking and diameter expansion are not allowed during use. The expansion of the tundish nozzle will cause too much molten steel to flow into the crystallizer, and the casting machine is forced to increase the casting speed, resulting in steel leakage accidents. The casting machine often stops casting due to the expansion, explosion or fall-off of the tundish nozzle. The larger the diameter of the tundish nozzle, the more molten steel will flow into the crystallizer per unit time.

$ZirconiaRefractories$

Magnesium Stabilized Zirconia Refractories Slide Gate Plate

The slide plate insert plays a vital role in controlling the flow of molten steel from the ladle to the tundish during the steelmaking process. It is installed at the bottom of the ladle and acts as a barrier to regulate the flow of steel. The zirconium material used in the plate ensures that it can withstand the high temperature and corrosiveness of the molten steel without deterioration, thereby ensuring a smooth and effective flow of steel.

The zirconia slide gate plate uses a high-temperature adhesive to inlay it in the central working area and casting hole of the slide plate, taking advantage of the excellent corrosion resistance and scouring resistance of zirconium oxide, the slow expansion speed increases the strength of the slide plate surface, improves its service life, and reduces the cost. It can better meet the continuous casting requirements of high-oxygen steel, high-calcium steel, high-manganese steel and other types of steel.

One of the main advantages of using a zirconia slide gate plate is its long service life. Zirconia material has excellent wear resistance, allowing the plates to withstand the abrasive nature of molten steel. Zirconia plates offer exceptional thermal stability, wear resistance, and chemical resistance. Zirconia provides high resistance to thermal shock and erosion and helps prevent steel or slag from sticking.This reduces downtime for maintenance and replacement, resulting in cost savings for steel producers.

In addition, the zirconia slide gate plate helps improve the quality of the steel produced. By regulating the flow of molten steel, it ensures that the steel is evenly distributed and free of impurities. This results in a higher quality steel product with improved mechanical properties.

newsuploads201912CgAH6F3wp4OAXs2pAAB3qBUmlA569

Magnesium Stabilized Zirconia Setter Plate

Operating temperature: Maximum operating temperature 2600°C

Applicable environment: air, vacuum or atmosphere reduction

Zirconia setter plates have high temperature stability, good mechanical strength and thermal conductivity. In addition, it also has excellent thermal shock resistance and can maintain stable performance in rapid temperature changes. Able to withstand corrosion from various metal oxide/non-metal oxide melts. No chemical reaction or adhesion occurs with components being fired, which can ensure the stability and consistency of the performance of electronic products and improve the qualified rate of fired products.

Applications

1. High-temperature applications: Due to its excellent high-temperature resistance, zirconia setter plates are used in high-temperature sintering and melting processes in the ceramic industry.

2. Electronics industry: In the manufacturing process of integrated circuits, semiconductors, etc., zirconia setter plates provide a stable operating platform.

3. Chemical and metallurgical industries: Due to its corrosion resistance and high-temperature stability, this material is also widely used in chemical and metallurgical processes.

20241202142601

Magnesium Stabilized Zirconia Gas Atomizing Nozzle

Operating temperature: 2200°C

Applicable environment: air, vacuum or atmosphere protection environment

Gas atomization powder making refers to the use of high-speed airflow to break up the liquid metal flow into small droplets, and then quickly condense to obtain shaped powder. Gas atomization technology has become the most important method for preparing fine spherical metal and alloy powders. There are many types of metal powders that can be produced by atomization, including almost all common metals and alloy systems except refractory metals such as tungsten and molybdenum and very active metals.

Properties of Zirconia Gas Atomizing Nozzle

Zirconia ceramic is used for gas atomizing nozzles in powder metallurgy and metal atomization because it has unique properties that make it ideal for this high-temperature, high-wear application.

Zirconia has a very high melting point and excellent thermal stability, enabling it to withstand the intense heat generated by molten metals and the high-speed gas flow required for atomization. This stability helps prevent nozzle deformation and degradation under extreme conditions.

Atomizing nozzles endure high-velocity gas and molten metal spray, which causes significant wear. Zirconia ceramics offer exceptional hardness and resistance to abrasion, helping the nozzle maintain its structural integrity and performance over extended periods.

Rapid temperature fluctuation happens during heating metal spray and cooling phases. Zirconia's high resistance to thermal shock helps it withstand these cycles without cracking, ensuring reliable operation and a longer service life.

Zirconia is also highly resistant to chemical corrosion, even in environments with reactive molten metals and gases. This property helps prevent the nozzle from reacting with molten metal and preserves the nozzle's internal geometry, which is critical for maintaining consistent atomization performance.

Zirconia's low wettability by molten metals reduces the tendency of metal particles to adhere to the nozzle, which can otherwise clog the nozzle and disrupt the atomization process. This helps maintain a steady flow of atomized particles and consistent powder quality.

Zirconia can be manufactured with very precise dimensions and smooth surfaces, allowing for highly accurate gas flow channels. This accuracy is essential in controlling the gas flow pattern and achieving the desired particle size distribution in the atomization process.

zirconia nozzle