The materials commonly used for furnace insulation include mineral wool, ceramic fiber, fire brick, and microporous silica-based materials.
Mineral wool has a temperature rating of up to 649°C and a thermal conductivity ranging from 0.032-0.044 W/m.k. It is lightweight, soft in texture, and offers good insulation.
Ceramic fiber has a temperature rating of 1260-1400°C and a thermal conductivity of 0.12 W/m.k. It is commonly used for high-temperature applications and provides insulation.
Fire brick has a temperature rating of around 1649°C and a thermal conductivity ranging from 0.15-0.56 W/m.k. It is heavy in weight, hard in texture, and offers general insulation.
Microporous silica-based materials have a temperature rating of 1600°C and a thermal conductivity ranging from 0.021-0.034 W/m.k. They provide insulation and are commonly used in high-temperature environments.
Graphite insulation materials can also be used in furnaces for excellent thermal insulation properties and high thermal stability. They are typically manufactured from rigid graphite fiber board or graphite felt and vary in insulation thickness based on maximum desired operating temperatures and hot zone size.
Carbon fiber reinforced carbon (CFRC) components can also be used for insulation and fastening in high-temperature furnaces. They provide high performance and protection against gas erosion. Molybdenum screws are commonly used for fastening, but they can become brittle and prone to breakage after the first heating, leading to insulation instability and potential damage. Using alternative fastening materials can help improve efficiency and reduce downtime.
Overall, the choice of furnace insulation material depends on the specific temperature requirements, insulation properties, and budget considerations.
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