Maximum temperature of high-temperature graphite vacuum furnace

The maximum temperature of high-temperature graphite vacuum furnaces varies depending on the equipment model and design. The maximum temperature range of common models covers 1600 ℃ to 3000 ℃, with mainstream equipment concentrated between 2000 ℃ and 2200 ℃, and extreme models reaching 2800 ℃ to 3000 ℃. The following is a specific analysis:

1. Mainstream equipment temperature range
1600℃-1800℃
Suitable for laboratory and small-scale production, such as vacuum graphite atmosphere high-temperature furnaces, with a maximum temperature of 1600 ℃ and a maximum vacuum degree of ≤ 5 × 10 ⁻⁶ mbar, meeting the experimental requirements of powder samples under vacuum or protective atmosphere.
Some models can reach a maximum temperature of 1800 ℃ and use graphite felt insulation structure, supporting protective gas or vacuum operation.
2000℃-2200℃
The typical temperature range of industrial grade high-temperature graphite vacuum furnaces, such as ultra-high temperature graphite vacuum furnaces, can reach up to 2200 ℃, with heating zone sizes ranging from 200 × 200 × 300mm to 600 × 600 × 900mm, meeting the needs of large-scale production.
The other model (2200 ℃ version) uses an optical pyrometer for temperature measurement and supports hydrogen and other reactive gas operations, making it suitable for high-temperature alloy melting and heat treatment.
2800℃-3000℃

2. Factors affecting temperature differences
Heating element material
The purity (such as high-purity graphite purity ≥ 99.9%) and crystal structure of graphite directly affect its high temperature resistance performance. The higher the purity, the lower the resistivity, the stronger the conductivity, and can withstand higher temperatures.
Thermal insulation structure design
Insulation materials such as graphite felt and multi-layer heat shields can reduce heat loss and improve temperature uniformity inside the furnace. For example, a double-layer air-cooled furnace shell is equipped with a built-in cooling fan to ensure that the surface temperature of the furnace shell is below 60 ℃, thereby extending the service life of the equipment.
Vacuum system performance
The ultimate vacuum degree affects the quality of material processing. A high vacuum environment can reduce thermal losses, minimize oxidation risks, and support stable operation at higher temperatures.
Control system accuracy
The advanced control system supports segmented programming heating, with a maximum heating rate of 50 ℃/min, ensuring temperature fluctuations within ± 5 ℃ and meeting precision process requirements.

3. Typical application scenarios
1600 ℃ -1800 ℃: Conventional high-temperature processes such as metal sintering, ceramic heat treatment, and powder metallurgy.
2000 ℃ -2200 ℃: Extreme processes such as high-temperature alloy melting, graphitization of carbon materials, and preparation of semiconductor materials.