A tubular furnace (also called a tube furnace) is a type of high-temperature heating device that uses a cylindrical heating chamber—often made of refractory material or enclosed in insulation—to heat samples contained in a tube. This design provides uniform temperature control and is widely used for laboratory experiments, material processing, and industrial applications.

Here’s a detailed breakdown:

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1. Definition and Concept

A tubular furnace is essentially a furnace where the heating elements surround a tube (usually ceramic, quartz, alumina, or metal) through which a sample is processed. The tube can be oriented horizontally, vertically, or at an angle, and the atmosphere inside can be air, inert gas, vacuum, or reactive gas, depending on the application.

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2. Structure and Components

Typical components include:

• Heating Chamber – Surrounds the tube and contains heating elements (e.g., Kanthal wires, SiC rods, MoSi₂ elements).
• Tube – The core where samples are placed; material choice depends on temperature and chemical resistance needs.
• Insulation Layer – High-temperature ceramic fiber or refractory insulation to retain heat.
• Temperature Controller – Usually a PID controller connected to a thermocouple for precise regulation.
• End Caps / Flanges – To seal the tube and connect to gas inlet/outlet systems.
• Gas Flow System – For creating controlled atmospheres (e.g., nitrogen, argon, hydrogen).
• Cooling and Safety Devices – Fans, thermal cutoffs, and over-temperature protection.

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3. Working Principle

The furnace heats the surrounding chamber via resistive heating elements. Heat is transferred to the tube wall by radiation and conduction, and then to the sample inside mainly by conduction and convection (if a gas atmosphere is present).

• Temperature is regulated by a feedback loop between the thermocouple and the PID controller.
• Gas flow or vacuum control allows modification of the processing environment.

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4. Types of Tubular Furnaces

• Single-zone tube furnace – Uniform heating in one central zone.
• Multi-zone tube furnace – Multiple heating zones for creating temperature gradients.
• Split tube furnace – Hinged body for easy tube insertion/removal.
• Rotary tube furnace – Tube rotates to improve mixing and uniform heating.
• Vertical tube furnace – For gravity-assisted processes or CVD growth.

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5. Applications

Tubular furnaces are used in:

• Material science – Sintering ceramics, calcining powders.
• Metallurgy – Annealing, reduction, carburization.
• Chemistry – Catalyst preparation, pyrolysis, thermal decomposition.
• Electronics – Semiconductor processing, diffusion, oxidation.
• Environmental research – Biochar production, gas-solid reaction studies.

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6. Advantages

• Uniform temperature distribution along the tube.
• Atmosphere control for oxidation, reduction, or inert environments.
• Flexible design (horizontal, vertical, split, rotary).
• High temperature range (from <500 °C to >1800 °C).

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7. Selection Considerations

When choosing a tubular furnace, consider:

• Max operating temperature (e.g., 1200 °C, 1600 °C, 1800 °C).
• Tube material (quartz for clean atmospheres, alumina for high temp, metal for vacuum).
• Heating element type (Kanthal for <1300 °C, SiC for 1600 °C, MoSi₂ for >1700 °C).
• Atmosphere requirements (air, inert, reducing, vacuum).
• Tube diameter and length according to sample size.

Tubular Furnace Technical Parameters

Model	Max temperature	Heating zone length	Constant temperature zone length	Power and voltage	Furnace tube size	Dimensions
YXG-1200-A1	1200℃	200mm	60mm	1.5kW/AC220V	φ30/50*500mm	800*340*400mm
YXG-1200-A2	1200℃	440mm	120mm	3kW/AC220V	φ30/100*1000mm	1120*480*530mm
YXG-1200II-200	1200℃	200+200mm	200mm	3KW/AC220V	φ30/100*1000mm	1100*420*560mm
YXG-120OIII-200	1200℃	3*200mm	3*60mm	4.5KW/AC220V	φ30/100*1000mm	1400*420*560mm
YXG-1400-400	1400℃	400mm	120mm	5kW/AC220V	φ30/100*1000mm	1200*500*660mm
YXG-140OIl-200	1400℃	200+200mm	200mm	5kW/AC220V	φ30/100*1000mm	1200*500*660mm
YXG-1700-290	1700℃	290mm	80mm	6kW/AC220V	φ30/100*1000mm	1300*640*870mm

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