Hydrogen (H2) is a highly reducing gas and the lightest substance. Its molecular movement and diffusion speeds are extremely rapid, and it possesses strong permeability at both normal and high pressures. Due to H2’s strong thermal conductivity, the refractory materials used in the furnace’s heat-resistant structure must exhibit enhanced resistance to hydrogen reduction, lower porosity, and lower thermal conductivity.
Alumina Silica Fire Brick Used in Hydrogen Reduction Furnaces
In furnaces with low H₂ content and operating temperatures generally between 800°C and 1300°C, the lining refractory materials used are primarily alumina silica fire brick, primarily low-iron, high-alumina bricks and corundum bricks. The working layer primarily uses low-iron, high-alumina bricks and hollow corundum sphere castables, while the insulation layer primarily utilizes lightweight mullite bricks and low-iron insulating castables. This is primarily due to the performance characteristics of alumina-Si refractory materials that meet the requirements of actual working environments and have the potential to serve as refractory materials for furnace linings.
High-alumina bricks and corundum bricks are both alumina-silica fire bricks, which are based on alumina and silica. They offer a wide variety of products and a wide range of applications, representing a significant portion of refractory production. In addition to being made into fired or unfired bricks, aluminum-silicon refractories can also be made into cast products, as well as various grades of monolithic refractories, such as ramming materials, castables, and refractory coatings. The main advantages of aluminum-silicon refractories for their widespread application in high-temperature industries are:
- Excellent high-temperature resistance: Alumina silica fire brick has high refractoriness, excellent thermal shock resistance, and high-temperature chemical stability. They generally maintain good stability and strength in high-temperature environments and can withstand the extreme temperatures found in high-temperature furnaces.
- Good corrosion resistance: These refractories exhibit a certain degree of corrosion resistance against chemicals such as acids and alkalis, allowing them to operate stably for long periods in corrosive atmospheres.
- Good mechanical properties: These refractories generally possess excellent mechanical strength and durability, capable of withstanding the mechanical stresses and vibrations experienced during furnace operation.
- High adaptability: Aluminum-silicon refractories can be tailored to meet the specific refractory requirements of different industrial sectors through different formulations and preparation processes, demonstrating their high adaptability.
- Good cost-performance: Compared to other high-performance refractories, alumina silica fire bricks generally have a lower cost, providing a more economical solution.
To purchase high-quality alumina-silicon refractory bricks, please contact Rongsheng Refractory. Receive free samples and quotes.
