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 ℃.