Flat Top Lifting Double Cathode Ion Nitriding Furnace For Metal Surface Treatment

※ Equipment Use

The large flat-top lifting double-cathode ion nitriding furnace is a kind of equipment used for surface nitriding treatment of metal materials.

※ Structural Features

• Furnace structure: adopts large flat roof design, the furnace cover can be lifted and lowered to facilitate the loading and unloading of the workpiece. The furnace body is usually made of high-quality steel, has good sealing and strength, and can withstand high temperature and vacuum environment.
• Dual cathode system: Equipped with two cathodes, it can nitride two workpieces or a group of large workpieces at the same time, improving production efficiency. The cathode adopts special material and structure design, which can distribute ion flow uniformly and ensure the consistency of nitriding effect.
• lifting system: composed of motor, screw, guide rail, etc., can realize the stable lifting of the furnace cover. The lifting speed can be adjusted as needed, usually between a few centimeters to tens of centimeters per minute.
• Heating system: resistance heating or electromagnetic induction heating is generally used, which can quickly increase the temperature in the furnace to the required nitriding temperature, and the temperature uniformity is good.
• vacuum system: including vacuum pump, vacuum pipe, vacuum valve and vacuum gauge, etc., can pump the furnace to a high vacuum state, to create a good vacuum environment for ion nitriding, usually the limit vacuum degree up to 10⁻¹Pa~10⁻³Pa level.
• Gas supply system: It is equipped with multiple gas supply pipes and high-precision flowmeter, which can accurately control the flow rate and pressure of nitrogen-containing gas (such as nitrogen, ammonia, etc.) into the furnace to meet the needs of different nitridation processes.
• Temperature measurement and temperature control system: temperature measurement is carried out through multiple thermocouples and other temperature measuring elements inserted into different positions in the furnace, and the temperature signal is fed back to the temperature control instrument, so as to achieve accurate control of the temperature in the furnace. The temperature control accuracy can reach ±1℃~±5℃.

※ Working principle

• In a vacuum environment, fill the furnace with nitrogen-containing gases, such as nitrogen and ammonia. The power supply of the device applies an electric field between the anode and cathode to ionize the nitrogen-containing gas and produce charged particles such as nitrogen ions and electrons, forming a plasma. Nitrogen ion is accelerated under the action of electric field, high-speed bombarding the surface of the metal workpiece, the kinetic energy of the ion is converted into heat energy to heat the workpiece, at the same time, nitrogen ion obtains electrons on the surface of the workpiece to reduce to nitrogen atoms, nitrogen atoms penetrate into the metal surface and spread to the interior, chemical reaction with metal atoms, forming a nitriding layer on the metal surface.

※ Technical parameters

• Furnace size: according to different production needs, the diameter of the furnace can reach more than 2000mm, and the depth of the furnace can reach more than 3000mm to meet the nitriding treatment of large workpieces.
• Temperature range: The common working temperature is generally 500℃~650℃, and the highest working temperature can reach about 700℃, which can meet the ion nitriding temperature requirements of most metal materials.
• Power supply parameters: The output voltage is generally 0V-1000V continuously adjustable, the output current varies according to different device models, common 100A, 150A, 200A, etc., the frequency is usually below 100Hz.
• vacuum degree: the limit vacuum degree can usually reach 10⁻¹Pa~10⁻³Pa, the pressure rise rate is less than 0.67Pa/h, to ensure the stability of the vacuum environment in the furnace.
• Gas flow: The flow of nitrogen-containing gas into the furnace can be precisely controlled, usually in the range of 0-1000L/h adjustable.
• Gas pressure: the supply gas pressure is generally between 0.1MPa-0.5MPa to ensure that the gas can be evenly distributed in the furnace and in full contact with the workpiece.
• lifting speed: the lifting speed of the furnace cover is generally between 5cm-20cm per minute, which can be adjusted according to actual needs.

※ Performance Advantage

• High production efficiency: the dual cathode design can process multiple workpieces at the same time, which greatly improves the production efficiency and reduces the processing time and cost.
• Good nitriding effect: the dual cathode system can make the ion flow more evenly distributed on the surface of the workpiece, so as to obtain a more uniform and dense nitriding layer, which improves the surface hardness, wear resistance and corrosion resistance of the workpiece.
• easy operation: the lifting design of the furnace cover makes the loading and unloading of the workpiece more convenient and fast, and reduces the difficulty and labor intensity of manual operation. At the same time, the equipment is equipped with advanced control system, which can realize automatic operation and improve the stability and reliability of the production process.
• Wide range of application: suitable for nitriding of carbon steel, alloy steel, stainless steel, die steel, titanium alloy and other metal workpieces of various shapes and sizes, especially suitable for processing large and complex shape workpieces.

Technical parameter