Vertical Tubular Furnace is a high-temperature heat treatment device with a vertically mounted heating tube. Samples are loaded from top to bottom via a rack/basket or crucible. It is suitable for gravity-assisted processes (such as crystal growth, particle sintering, CVD deposition, annealing, etc.) and can operate in air, inert gas, or vacuum/low-pressure environments.

Structural Components

Furnace and Insulation: Double-layer shell + vacuum fiber or alumina fiber insulation, with air cooling of the outer shell.

Heating Elements: Resistance wire (FeCrAl), SiC, MoSi₂, or graphite (ultra-high temperature/inert gas).

Temperature Zones: Single, dual, or triple; multiple zones are used for gradient or constant temperature zone elongation.

Quartz/Ceramic Tube: Commonly used diameters are 40–150 mm; materials include quartz, 99% alumina, and ceramic composite.

Seal and Pumpdown: Flange + O-ring + clamp; can be connected to a backing pump/molecular pump for low pressure or high vacuum.

Gas flow system: Mass flow meter (MFC), gas mixing/purge valve, exhaust gas purification.

Temperature control system: PID/programmable temperature controller, supporting multi-stage temperature ramping, over-temperature interlock, and data logging.

Sample loading fixture: Hanging rod, crucible tray, quartz boat, rotating/lifting mechanism (optional).

Operating Principle (Brief Description)

Electricity → Heat generated by the heating element → Heat transferred to the workpiece inside the tube through radiation and convection. Vertical placement allows for more uniform airflow from bottom to top or top to bottom. Gravity helps densify and settle particles, reducing dust and contamination. Combined with sealing and vacuuming, sintering, annealing, and deposition processes can be completed under a defined atmosphere, pressure, and temperature profile.

Typical Advantages

More stable flow field: Vertical airflow reduces eddy currents and secondary particle contamination, facilitating mass transfer of CVD/ALD precursors.

More flexible clamping: Samples can be suspended or stacked in layers, suitable for long pieces, bars, and crucibles.

Excellent temperature uniformity: Multiple temperature zones can achieve ±1–3°C uniformity (depending on model and sample loading).

Small footprint: Vertical structure saves benchtop space and facilitates modular integration.

Applicable processes and industries

Material sintering/densification: Ceramics, powder metallurgy, lithium iron phosphate precursors, etc.

Annealing/stress relief: Metal wire, glass rods, semiconductor wafers.

Vapor deposition: CVD/low-pressure CVD (LPCVD) thin films, catalyst support modification.

Pyrolysis/calcination: Precursor decomposition, oxidation/reduction treatments, surface functionalization.

Crystal growth/pulling: Gravity-assisted growth of small crystals or nanowires.

Vertical Tube furnace Technical Parameters

Model	YXV- 1200-V1
Furnace tube specifications	50*42*500mm(outer diameterinner diameterlength)with 5-10micron sand core layer in the middle
Operating voltage	Single-phase AC220V,50/60Hz
Heating element	High-quality HRE heating wire
Operating temperature	Maximum temperature:1200℃(≤30min)Long-term working temperature:1100℃ Recommended heating rate:5-20℃/min
Heating zone	Heating zone length:220mm Constant temperature zone length:60mm(±3℃)
Control method	The fully automatic control system automatically operates from room temperature to the set temperature after programming.The system utilizes thyristor control and a modular temperature control system design,resulting in a simple structure and easy maintenance.The instrument utilizes a 30-segment programmable meter,allowing for freely set constant temperature and holding curves with interference-free switching. The meter also features temperature correction and compensation functions.
Security Features	Over-temperature alarm and door-opening power-offfunction
Features	Standard three-color status reminder function:blue for waiting,green for running, and red for abnormality(with buzzer)
Display accuracy	±1℃
Sealing system	Both ends of the furnace tube are equipped with quick-opening flanges. (Including precision needle valve,pointer vacuum pressure gauge,hose connector,etc.)
Atmosphere	Various atmospheres such as oxygen,nitrogen,argon,etc.
Temperature measuring element and temperature measuring range	K-type thermocouple,temperature measurement range 0-1200℃,the thermocouple is close to(contacting)the outer wall of the tube,which can reduce the surface temperature to room temperature and make the inner cavity temperature uniform.
Air cooling system	The fan impeller is directly mounted on the bottom of the double-layer furnace shell and assembled with the control system.When heating,air cooling is performed to reduce the surface temperature of the furnace shell and protect the electrical equipment from heat dissipation,making operation safer for personnel and improving efficiency
refractory materials	The furnace lining is made of high-quality high-purity alumina fiber,vacuum-formed fiber polylight board material,and lightweight hollow ball alumina board.It has high operating temperature,small heat storage,resistance to rapid heating and cooling,no cracks,no slag,and good thermal insulation performance(the energy saving effect is more than 80%of the old electric furnace).

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