Silicon Nitride-Carborundum Insulating Fire Brick

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High Alumina Insulating Fire Brick

1. Characteristic

High strength

Low thermal expansion coefficient

Good thermal conductivity and thermal shock resistance

Good resistance to liquid aluminum erosion capability

High erosion

2. Applications

Widely used in large aluminum electrolytic cell of lining material. In the electrolytic aluminium industry, because of nitride bonded silicon carbide products can be made thin wall lining, enlarge the tank capacity, improve the thermal conductivity, can rapid cooling, and they are permitted to enter a higher power, increase the tank production capacity, at the same time, in its surface can form alumina and cryolite of eutectic content, in order to protect the tank lining work layer, prolong service life, therefore, this product is aluminum industry generally welcome.

3. Physical and Chemical Index of silicon nitride bonded silicon brick used in cooling stave

ITEM		INDEX
SiC %		72 Min
Si3N4 %		21 Min
Fe2O3 %		0.5 Max
Porosity %		18 Max
Bulk density g/cm3		2.65-2.70
Bending strength MPa	Room temperature °C	42
	1400 °C	45
CCS MPa		150 Min
Thermal conductivity w/m·k 1250 °C		15-18
Tolerance	0-100 mm	±1.0
	101-300 mm	±1.5
	301-500 mm	±2.0
	More than 500 mm	±0.5%
	Surface irregularity	0.2 Max
	Face verticality	0.5 Max
	Diagonal difference	2 Max

Q: Are insulating fire bricks resistant to abrasion or wear?: Yes, insulating fire bricks are generally resistant to abrasion or wear. These bricks are designed to withstand high temperatures and provide insulation, making them durable and less prone to wear or damage from abrasion.

Q: Do insulating fire bricks require any special curing or firing process before use?: No, insulating fire bricks do not typically require any special curing or firing process before use. Insulating fire bricks are designed to be used as a form of insulation in high-temperature applications such as kilns, furnaces, and fireplaces. These bricks are made from lightweight materials that have high insulating properties, allowing them to withstand extreme temperatures while minimizing heat loss. Unlike traditional fire bricks, which are made from dense and heavy materials, insulating fire bricks are manufactured using a combination of lightweight aggregates and refractory clay. This composition gives insulating fire bricks their excellent thermal insulation properties. Due to their lightweight nature and low thermal conductivity, insulating fire bricks do not require any special curing or firing process before use. They can be installed directly in the desired application without any prior treatment. However, it is essential to ensure that the bricks are properly aligned and securely placed to maximize their insulating capabilities. It is worth noting that individual manufacturers may provide specific instructions or recommendations for the installation and use of their insulating fire bricks. Therefore, it is always advisable to consult the manufacturer's guidelines to ensure proper installation and usage of these bricks.

Q: Can insulating fire bricks be used as a lining material for boilers?: Yes, insulating fire bricks can be used as a lining material for boilers. Insulating fire bricks are made from lightweight refractory materials that have high insulating properties. These bricks are designed to withstand high temperatures, making them suitable for use in boilers where temperatures can reach up to several hundred degrees Celsius. The insulating properties of these bricks help to reduce heat loss, improving the energy efficiency of the boiler. Additionally, insulating fire bricks are resistant to thermal shock, which is crucial for withstanding the rapid temperature changes that occur in boilers. Overall, insulating fire bricks are a suitable choice for lining boilers due to their excellent insulating properties and ability to withstand high temperatures.

Q: Can insulating fire bricks be used in high-temperature insulation for aerospace applications?: Yes, insulating fire bricks can be used in high-temperature insulation for aerospace applications. Insulating fire bricks are made from lightweight refractory materials that have high insulating properties and can withstand extreme temperatures. These bricks have low thermal conductivity, which allows them to effectively reduce heat transfer and maintain the desired temperature inside aerospace components. Aerospace applications often involve high-temperature environments, such as in rocket engines, exhaust systems, and thermal protection systems. Insulating fire bricks can be used in these applications to provide thermal insulation, protecting sensitive components from excessive heat and preventing heat loss to the surroundings. Additionally, insulating fire bricks are known for their excellent resistance to thermal shock, meaning they can withstand rapid temperature changes without cracking or degrading. This property is crucial in aerospace applications where components are subjected to extreme temperature variations during launch, re-entry, or other operational phases. Moreover, insulating fire bricks have lightweight properties, which can be advantageous in aerospace applications where weight reduction is critical for fuel efficiency and overall performance. By using insulating fire bricks, aerospace engineers can achieve effective thermal insulation while minimizing the added weight to the system. Overall, insulating fire bricks offer a viable solution for high-temperature insulation in aerospace applications. Their high insulating properties, resistance to thermal shock, and lightweight nature make them suitable for protecting critical aerospace components in extreme temperature environments.

Q: Can insulating fire bricks be used in the construction of hearth furnaces?: Yes, insulating fire bricks can be used in the construction of hearth furnaces. These bricks are designed to withstand high temperatures and have excellent insulation properties, which makes them ideal for creating the lining of a hearth furnace. Their ability to retain heat and resist thermal shock helps in maintaining a stable and efficient heating environment in the furnace.

Q: What is the typical weight of an insulating fire brick?: The typical weight of an insulating fire brick can vary depending on its size and composition, but it typically ranges from 2 to 4 pounds (0.9 to 1.8 kilograms).

Q: Can insulating fire bricks be used in chimneys and fireplaces?: Chimneys and fireplaces can indeed utilize insulating fire bricks. These bricks are specifically crafted to endure high temperatures and offer exceptional insulation. They are constructed from lightweight materials like ceramic fibers or refractory materials, which aid in minimizing heat transfer. Thus, they are an optimal choice for lining chimneys and fireplaces since they retain heat within the firebox and prevent its escape through the chimney. Moreover, insulating fire bricks enhance the heating system's efficiency by reducing heat loss and elevating the overall heat output. However, it is crucial to emphasize that insulating fire bricks should only be employed in appropriate sections of the chimney or fireplace, such as the firebox. Conversely, the smoke chamber or flue necessitate different types of bricks capable of withstanding the corrosive effects of flue gases.

Q: What are the types of building blocks?: Ordinary housing: building brick (clay brick), and non sintered brick (sand lime brick, fly ash brick, cement brick, etc.)

Q: Can insulating fire bricks be used in steam boilers?: Yes, insulating fire bricks can be used in steam boilers. Insulating fire bricks are designed to have low thermal conductivity, which means they can effectively retain heat and resist the transfer of heat from one side to the other. This makes them suitable for use in steam boilers, where they can help to improve energy efficiency by reducing heat loss. Additionally, insulating fire bricks are also resistant to high temperatures, making them appropriate for use in the high-temperature environment of a steam boiler.

Q: Are insulating fire bricks resistant to alkali vapor attack?: Insulating fire bricks are known for their general resistance to alkali vapor attack. They are crafted from high-quality refractory materials like fire clay or silica, which possess exceptional resistance to chemical assaults, including alkali vapor. These bricks are engineered to endure extreme temperatures and challenging surroundings, rendering them suitable for applications where alkali vapor may be present, such as in industrial furnaces, kilns, and incinerators. However, the level of resistance may vary depending on the specific composition and manufacturing process employed for these insulating fire bricks. To ensure compatibility with alkali vapor exposure, it is advisable to refer to the manufacturer's specifications or seek expert advice.

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