Graphite vacuum furnace: "oxygen-free laboratory" for precision manufacturing

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Graphite vacuum furnace: "oxygen-free laboratory" for precision manufacturing

Graphite vacuum furnace is a kind of equipment that plays an important role in specific fields. Taking the vacuum carbon tube resistance furnace as an example, it is a high-temperature, high-vacuum resistance furnace that uses graphite as the heating element. It is composed of a furnace cover, a furnace body, a furnace bottom and a vacuum unit. The inner layer of the furnace shell is stainless steel, and the outer layer is carbon steel. The two layers are cooled by water. The furnace shell is equipped with exhaust ports, observation holes, thermocouple holes, protective atmosphere inlets and outlets, explosion-proof ports, etc. The furnace is equipped with graphite electrodes, which are connected to the graphite heating element by cylindrical contact. There is a heat insulation screen device composed of multiple layers of radiation screens around the heating element. The following is an analysis of its technical advantages from three dimensions:

1. Core material: the "three highs" characteristics of graphite

High temperature resistance
The melting point of graphite is as high as 3850℃, and the structure is stable at high temperature, supporting the long-term operation of the furnace above 2000℃ (such as sapphire crystal growth requires an environment of 1900-2200℃).

High efficiency of thermal conductivity
The thermal conductivity is 1.5 times that of steel. With the vacuum environment (≤6×10⁻³Pa), heat can be evenly transferred to the workpiece to avoid local overheating.

Chemical corrosion resistance
Strong corrosion resistance to acids, alkalis and molten metals, ensuring pollution-free treatment of high-purity materials (such as semiconductor silicon wafers).

2. Core structure: modular design adapts to multiple scenarios

Heating system

a. Heating element: graphite rod/tube/plate, customizable multi-zone layout (such as spiral, mesh), achieving ±1℃ precise temperature control.

b. Support parts: graphite bracket, connecting rod, bolt, etc., impact-resistant and reduce heat loss.

Vacuum system
Mechanical pump + diffusion pump combination vacuum to prevent material oxidation (such as titanium alloy sintering requires an oxygen-free environment.

Intelligent control
51-segment programming curve automatic heating/insulation/cooling, infrared temperature measurement + tungsten-rhenium thermocouple dual redundant monitoring.

Graphite vacuum furnace
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3. Typical application scenarios

High-end material synthesis

Silicon carbide reinforced graphite parts (improve wear resistance), ceramic-based composite material sintering.

Semiconductor manufacturing

Wafer annealing, gallium arsenide single crystal growth (depending on 2200℃ uniform thermal field).

Precision component processing

Aerospace alloy brazing (such as titanium aluminum blade connection), cemented carbide debonding Fat sintering.

4. Operational advantages and maintenance points

Energy saving and high efficiency: Graphite can quickly rise and fall temperatures (20℃/min), which saves more than 30% energy compared to traditional electric furnaces.

Life management: Boron-doped graphite parts can improve oxidation resistance and extend service life.

Safety protection: Double-layer water-cooled furnace shell + automatic power off at overtemperature to ensure continuous operation.

Tips: Three points need to be paid attention to when selecting the model - maximum temperature requirement (such as ＞2000℃, choose tungsten-rhenium temperature measurement), cavity size (adaptive workpiece), atmosphere type (nitrogen/argon protection, etc.). For more technical details, please refer to industry cases. Zhengzhou Protech Technology Co., Ltd has rich experience in the thermal and new materials production fields. Welcome to consult at any time.

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