1. Core structure and working principle
The high-temperature vertical quartz tube electric furnace features a vertical design as its core, optimizing space utilization through vertical layout, and is suitable for compact scenarios such as laboratory countertops or production lines. Its core structure includes:
Heating element: using resistance wire (such as nickel chromium alloy), silicon carbon rod or silicon molybdenum rod, converting electrical energy into thermal energy to achieve high temperature environment. Some models are equipped with multi zone temperature control function, which can independently adjust the temperature of different temperature zones to meet complex process requirements.
Quartz tube reaction chamber: High purity quartz glass tubes are selected, which have the following characteristics:
High temperature resistance: Long term use temperature up to 1100 ℃, short-term tolerance up to 1200 ℃;
Chemical stability: Except for hydrofluoric acid, it hardly reacts with acids, and its acid resistance is 30 times that of ceramics and 150 times that of stainless steel;
Thermal conductivity: Quickly transfer heat, reduce temperature gradient, and ensure uniform heating of the sample;
Transparency: It is convenient to directly observe the state of the sample, but it should be noted that high-temperature crystallization may affect the observation.
Insulation system: High efficiency insulation materials such as alumina fiber or high-purity quartz cotton are used to reduce heat loss and maintain stable temperature inside the furnace.
Atmosphere control system: Inert gases (such as nitrogen and argon) or reactive gases (such as hydrogen) are introduced through the inlet, and a vacuum pump is used to create a vacuum environment to prevent sample oxidation or promote specific chemical reactions.
Intelligent temperature control system: Integrated with microcomputer PID controller, programmable to set heating rate, constant temperature time and cooling curve, real-time temperature feedback through thermocouple, temperature control accuracy up to ± 1 ℃, ensuring process repeatability.

Five temperature zone high temperature vertical quartz tube electric furnace (click on the picture to view product details)

2. Analysis of Technical Advantages
Accurate temperature control:
Multi zone temperature control technology can achieve independent adjustment of different temperature zones, meeting the differentiated treatment needs of multiple components in composite material preparation;
The PID algorithm dynamically adjusts the heating power, eliminates temperature overshoot, and ensures that the fluctuation during the constant temperature stage is less than ± 5 ℃.

Wide adaptability to atmosphere:
Vacuum environment prevents sample oxidation and is suitable for processes such as metal melting and ceramic sintering;
Inert gas protection can suppress volatilization and improve the quality of high-purity material preparation;
The function of introducing reactive gases supports experiments such as chemical vapor deposition (CVD) and oxidation-reduction.

Structural and material optimization:
Vertical layout reduces footprint and facilitates integration with equipment such as glove boxes and gas purification systems;
The corrosion resistance of quartz tubes reduces the risk of pollution and extends the lifespan of equipment.

Security performance:
Multiple safety mechanisms such as over temperature protection, over-current protection, and circuit breaker protection, which automatically cut off the power supply in case of abnormalities;
Stainless steel flange sealing ensures vacuum degree and prevents gas leakage.

3. Typical application scenarios
Materials Science Research:
Diffusion, oxidation, and annealing of semiconductor materials;
Nanomaterial synthesis (such as preparation of carbon nanotubes);
Research on Interface Reaction of Composite Materials.

Industrial production:
Metal melting and casting (such as titanium alloys, high-temperature alloys);
Ceramic sintering (such as alumina, silicon nitride);
Graphitization treatment (to enhance the conductivity of carbon materials).

In the field of new energy:
Calcination of positive electrode materials for lithium batteries;
Solar cell coating (such as crystalline silicon substrate coating);
Preparation of hydrogen energy catalyst.

Other fields:
Drying of pharmaceuticals in the pharmaceutical industry;
High temperature reactions in the chemical industry, such as polymerization and cracking.

4. Selection and usage suggestions
Temperature requirements:
Select the 1100-1200 ℃ model for routine experiments;
Atmosphere control:
Choose an air atmosphere furnace for oxidation environment;
Inert/reducing environments require gas purification systems.
Size and Capacity:
Laboratory furnace selection tubes with a diameter of 50-100mm and a length of 600-1200mm;
Industrial production needs to be customized according to sample size.
Operation and maintenance:
Regularly calibrate the temperature controller to ensure accuracy;
Clean the inner wall of the quartz tube to prevent the deposition of volatile substances;
Match the resistance value when replacing the heating element to avoid uneven temperature field.

Large customized high-temperature vertical quartz tube electric furnace with preheating (click on the picture to view product details)

5. Market representative products
Single temperature zone high temperature vertical tube furnace:
Temperature range: Room temperature -1200 ℃;
Temperature control accuracy: ± 1 ℃;
Atmosphere: vacuum/inert gas;
Applicable scenarios: Laboratory heat treatment, CVD experiments.
1200 ℃ multi zone temperature controlled high-temperature tube furnace:
Number of temperature zones: 2-4 zones with independent temperature control;
Temperature uniformity: ± 5 ℃;
Rotation function: supports uniform heating of samples;
Applicable scenarios: preparation of composite materials, metal diffusion welding, and synthesis of nanoparticles.
Click to learn more Vertical tube furnaces! Or click on online customer service to learn more about product information!