Pre-Vacuum Box-Type Nitriding Furnace
The pre-vacuum box-type nitriding furnace is a high-temperature processing device. The following is a detailed introduction to this equipment:

I. Basic Components
The pre-vacuum box-type nitriding furnace primarily consists of the furnace body, the furnace retort ( muffle), the furnace door, an electric heating system, a pre-vacuum system, a cooling system, a nitrogen potential measurement control system, a safety control system, other components. Among these, the furnace body constitutes the main structural framework of the equipment, while the furnace retort serves as the container for holding the workpieces undergoing treatment.

II. Working Principle
With a vacuum nitrogen atmosphere established inside the furnace, workpieces undergo processes—such as nitriding—through the application of heat generated by resistance heaters. The temperature pressure within the furnace are monitored in real-time using measuring instruments (such as temperature sensors vacuum gauges); this data is fed back into the control system to ensure precise regulation of both temperature pressure. Simultaneously, the nitrogen potential measurement control system continuously monitors the nitrogen potential inside the furnace automatically adjusts the composition of the gas introduced into the chamber based on preset values, thereby ensuring the desired nitriding effect is achieved.

III. Key Features
High Heating Efficiency: Characterized by a rapid heating rate quick temperature rise fall, which helps conserve both time energy.
High Temperature Control Precision: The temperature control system employs PID closed-loop control to achieve a high degree of precision; typically, temperature stability is maintained within ±1°C, furnace temperature uniformity is within ±5°C.
Temperature Uniformity: The heating method utilizes a combination of radiant convective heating, ensuring uniform temperature distribution throughout the furnace chamber.
Ease of Operation: The gas control system is user-friendly supports multi-segment programmable temperature control. Furthermore, the equipment is equipped with a programmable controller a world-renowned brand, ensuring high reliability simple, intuitive operation.
High Safety: Internal furnace temperature pressure are monitored in real-time to ensure operational safety. The equipment is also outfitted with various safety protection features, such as automatic heating cutoff in the event of over-temperature conditions, the automatic influx of nitrogen gas if furnace pressure drops.
Rapid Cooling: The equipment features a dual internal external cooling system, which effectively reduces cooling times enhances production efficiency.

IV. Scope of Application
The pre-vacuum box-type nitriding furnace is widely utilized in fields such as new material preparation, surface treatment, metal material processing. In the realm of new materials, it is primarily employed for the synthesis of graphene, silicon nitride, aluminum nitride, composite materials, similar substances. In the field of metal material processing, it is predominantly used for the nitriding treatment of materials such as tool steel, alloy steel, mold steel. Furthermore, this equipment is suitable for the heat treatment of various molds, mechanical transmission components, gears, shafts, other high-precision parts—specifically processes such as nitriding nitrocarburizing.

V. Operational Procedure (Example)
Furnace Loading:Place the workpieces inside the furnace, situated within the gas guide cylinder retort.
Close Furnace Door:Ensure the furnace door is securely closed to prevent gas leakage.
Air Purge Heating:Heat the workpieces in an air-filled environment.
Pre-oxidation:Conduct a pre-oxidation process at a specific temperature to accelerate the nitriding rate enhance both the surface hardness the uniformity of the nitrided layer.
Vacuum Evacuation:Evacuate the furnace chamber using the pre-vacuum system to displace the internal air with nitrogen gas.
Nitrogen Repressurization:Repressurize the furnace chamber using low-pressure nitrogen gas to restore the internal pressure to the required operating level.
Continued Heating Nitrogen Supply:Continue heating the workpieces within a nitrogen atmosphere while supplying nitrogen gas to maintain the furnace pressure.
Nitriding Treatment:Once the target nitriding temperature is reached, introduce ammonia gas cracked ammonia gas via mass flow controllers to regulate the nitriding potential.
Nitrogen Purge Cooling:Upon completion of the nitriding process, perform a nitrogen purge; subsequently, activate the internal external circulation cooling systems to cool the workpieces as required by the specific process parameters.
Pre-Unloading Vacuum Repressurization:Once the temperature has dropped to the safe door-opening threshold, perform a final vacuum evacuation followed by repressurization using low-pressure nitrogen gas.
Door Opening Unloading:Once the furnace pressure reaches the designated setpoint, open the furnace door retrieve the workpieces.