Experimental gas tube furnace is a widely used heating equipment in laboratories. Its core function is to provide an ideal environment for material synthesis, heat treatment, chemical analysis and other experiments by accurately controlling the atmosphere and temperature inside the furnace. Let's take a detailed look at the gas tube furnace used in the experiment below!

Experimental gas tube furnace with a temperature of up to 1700 degrees (click on the image to view product details)

1. Equipment principle and structure
Heating principle
Using resistance heating method, electric heating elements (such as resistance wires, silicon carbon rods, silicon molybdenum rods) are uniformly wrapped around the furnace tube, and heat is transferred through thermal radiation and convection to ensure uniform temperature distribution inside the furnace.

Furnace tube design
Furnace tubes are usually made of high-purity corundum (alumina), metal tubes, or quartz, with high temperature resistance and strong chemical stability. The two ends of the furnace tube are sealed with flanges and can be evacuated to 10 ⁻ ² to 10 ⁻ ³ Pa, or filled with inert gases (such as nitrogen, argon), reducing gases (such as hydrogen), or oxidizing gases (such as oxygen) to form a specific reaction environment.

Temperature control system
Equipped with high-precision temperature controller (such as PID controller), supporting multi-stage program heating, with a temperature control accuracy of ± 1 ℃, and adjustable heating rate (usually ≤ 10 ℃/min, some models can reach 20 ℃/min). Temperature sensors (such as B-type thermocouples) monitor the temperature inside the furnace in real-time to ensure stable experimental conditions.

2. Core functions and advantages
Flexibility in atmosphere control
Single stage ventilation: Input protective gas or reactive gas through a single gas channel, suitable for simple experiments.
Two stage ventilation: Independently control two gas channels, which can simultaneously introduce different gases (such as nitrogen protection in one stage and hydrogen reduction in the other stage) to achieve complex reaction conditions.
Vacuum function: After vacuuming, specific gases are filled to prevent sample oxidation or contamination and improve material purity.

Temperature control accuracy
Support gradient heating, constant temperature maintenance, and rapid cooling to meet the temperature curve requirements of different materials. For example, the preparation of nanomaterials requires precise temperature control to regulate particle size; Metal heat treatment requires optimizing the microstructure through a specific temperature curve.

Operational safety
The furnace body adopts insulation materials to reduce heat loss and lower the risk of burns for operators.

3. Typical application areas
material synthesis
Nanomaterials: High purity metal nanoparticles, oxide nanowires, etc. are prepared by controlling the atmosphere and temperature. For example, metal nanoparticles can be synthesized by reducing metal salt solutions with hydrogen gas under argon protection.
Ceramic materials: Sintering ceramic powder in a nitrogen or oxygen atmosphere to optimize grain growth, improve material density and mechanical properties.
Composite material: A composite material that undergoes chemical reactions at different material interfaces by introducing reactive gases at high temperatures, forming chemical bonds.

metal heat treatment
Annealing: Heating the metal to a critical temperature in an inert gas and slowly cooling it to eliminate internal stress and improve plasticity.
Quenching: After rapid heating, immerse in a cooling medium to improve the hardness and wear resistance of the metal.
Tempering: Cooling after insulation at a specific temperature to adjust the toughness of the metal and reduce brittleness.

chemical analysis
Sample pretreatment: Ash organic samples in an oxygen or air atmosphere, remove organic matter, and analyze inorganic components.
Catalytic reaction research: Testing catalyst activity in controlled atmosphere and optimizing reaction conditions.

Experimental gas tube furnace that can rotate and tilt (click on the image to view product details)

4. Selection suggestions
temperature range
Select the rated temperature (such as 1200 ℃, 1400 ℃, 1700 ℃) according to the experimental requirements, and confirm whether the continuous working temperature meets the requirements (usually 100-200 ℃ lower than the rated temperature).

Furnace tube size
Select the diameter and length of the furnace tube according to the sample size, ensuring that the sample can be placed in the constant temperature zone (usually the 10-15cm area in the middle of the furnace tube).

Atmosphere control
Simple experiment: Choose a single-stage ventilation model that supports common gases such as nitrogen and argon.
Complex reaction: Choose two ventilation models that can independently control the flow rate and composition of two gases.
Vacuum requirement: Confirm the equipment vacuum degree (such as mechanical pump 10 ⁻ ² pa or molecular pump 10 ⁻ ³ pa) and pumping rate.

Brand selection
Precision model: Supports intelligent 30 segment programming and fuzzy PID control, suitable for scientific research institutions.
Economic model: The function meets the basic experimental needs and is suitable for teaching laboratories.

Additional features
Rotating furnace tube: suitable for experiments that require uniform heating or continuous feeding.
Water cooling system: accelerates the cooling process and shortens the experimental cycle.
Data recording: Supports exporting experimental data for easy analysis.Click to learn more customized tube furnaces! Or click on online customer service to learn more about product information!