Maximum temperature of high-temperature gas vacuum tube furnace

The maximum temperature of a high-temperature gas vacuum tube furnace is usually between 1200 ℃ and 2200 ℃, depending on the equipment model, heating element material, and furnace tube design. The following is a detailed analysis:

1. Mainstream model temperature range
Conventional model
Temperature range: Room temperature to 1800 ℃
Applicable scenarios: Meet the needs of low-temperature annealing (100-300 ℃) of polymer materials, metal heat treatment (quenching/annealing/tempering), electronic ceramic sintering, etc.
Typical equipment: such as a certain model of vacuum tube furnace, using silicon molybdenum rod heating, with a maximum temperature of 1700 ℃, suitable for material sintering and annealing under vacuum or inert gas protection.
Ultra high temperature model
Temperature range: up to 1800 ℃
Applicable scenarios: High temperature sintering of ceramic materials (1500-1800 ℃), ultra-high temperature experiments, etc.
Technical requirements: Molybdenum or tungsten wire heating elements are required, and the furnace tube should be replaced with high-temperature resistant graphite or tungsten tubes.

2. The influence of heating elements on temperature
Nickel chromium alloy wire
Applicable temperature: below 1000 ℃
Features: Low cost, suitable for low-temperature scenarios, but prone to aging at high temperatures.
Silicon molybdenum rod/silicon carbon rod
Applicable temperature: 1200-1600 ℃
Characteristics: Good high-temperature stability, but it is necessary to avoid prolonged insulation at 400-700 ℃ to prevent low-temperature oxidation.
Molybdenum wire/tungsten wire
Applicable temperature: above 1800 ℃
Features: Excellent high temperature resistance, but high cost, requiring use with graphite or tungsten tubes.

3. The limitation of furnace tube material on temperature
quartz tube
Maximum temperature: 1100 ℃
Applicable scenario: Oxidation atmosphere below 1000 ℃, but afraid of alkaline vapors (such as NaOH volatilization that can corrode quartz).
Corundum tube
Maximum temperature: 1600 ℃
Characteristics: Strong corrosion resistance, but the heating rate needs to be controlled (≤ 5 ℃/min) to avoid explosion caused by thermal stress.
Metal furnace tube (such as 310S stainless steel)
Maximum temperature: dependent on material temperature resistance
Applicable scenarios: Inert gas protection scenarios that require high pressure, but internal oxidation can contaminate the sample when the vacuum degree is insufficient.

4. Temperature control accuracy and uniformity
Temperature control accuracy: High end models can reach ± 1 ℃, achieved through PID regulation technology and real-time monitoring by thermocouples.
Temperature uniformity:
Conventional model: The temperature deviation within the effective heating zone is within ± 5 ℃.
High end model: Through multi-point temperature measurement technology and heating power zoning regulation, it achieves ultra-high uniformity of ± 1 ℃.