What is the typical material of a high-temperature muffle furnace?

There are various furnace materials for high-temperature muffle furnaces, and the selection of these materials usually depends on the maximum operating temperature of the furnace, the properties of the sample, and the specific needs of experimental or industrial applications. Here are some common high-temperature muffle furnace materials and their characteristics:
Aluminum oxide:
Has good high temperature resistance and chemical stability.
Suitable for high-temperature treatment applications that do not require high thermal conductivity.
Silicon carbide:
High temperature resistance, high strength, and good thermal conductivity.
Capable of withstanding high heat loads and temperature gradients.
Mullite:
High temperature resistance and good mechanical strength.
Has a certain degree of thermal shock resistance and is suitable for applications with large temperature fluctuations.
Corundum:
Has excellent high temperature resistance.
Commonly used in applications that require withstanding extremely high temperatures.
Graphite:
Good high-temperature stability and strong corrosion resistance.
Good thermal conductivity, and long lifespan and low coefficient of thermal expansion under high temperature, vacuum or inert atmosphere.
Suitable for most high-temperature processing applications, such as erosion of molten metals and glass.
High temperature alloy:
Good high-temperature stability, strong corrosion resistance, and high strength.
Has high durability and low coefficient of thermal expansion.
Suitable for high-temperature treatment and processing of special materials.
Special ceramic fiber materials:
Fast heating speed and good insulation effect.
Lightweight, soft texture, easy to process and install.
Commonly used in modern high-temperature muffle furnaces to improve heating efficiency and insulation performance.
When selecting furnace materials, in addition to considering high temperature resistance, factors such as chemical stability, thermal conductivity, thermal expansion characteristics, and compatibility with the furnace atmosphere also need to be taken into account. In addition, the selection of furnace material should be matched with other components of the furnace to avoid structural damage caused by inconsistent thermal expansion.

In summary, the furnace materials of high-temperature muffle furnaces are diverse, each with its unique advantages and applicable scenarios. When selecting, comprehensive consideration should be given to the specific needs of experiments or industrial applications to ensure that the selected material can meet the requirements of high temperature stability, chemical stability, thermal conductivity, and safety of the furnace.