Molybdenum foil
Molybdenum strip is a common high temperature resistance material, widely used in the field of heating and temperature control, especially in high temperature furnaces and industrial heat treatment equipment. The principles of heating, heat transfer and temperature control constitute the core of the operation of molybdenum strip equipment. The following will be detailed from the heating principle, heat transfer principle and temperature control principle of three aspects.
1. Molybdenum strip heating principle
Molybdenum strip is an excellent high temperature resistance material, and its heating principle is based on resistance heating effect. When the current passes through the molybdenum strip, the molybdenum strip, due to its high resistance, will convert the passing current into heat energy, resulting in heating. This process is described by Joule's law, which states that a current passing through a conductor generates heat due to its resistance. Molybdenum has a high melting point (2623°C) and excellent high temperature strength, so at extremely high temperatures, molybdenum strip can still maintain its structural integrity and electrical conductivity, not easy to oxidize or soften. This heating capacity of the molybdenum strip makes it an ideal heating element in high temperature furnaces, capable of maintaining a stable heating efficiency under extreme conditions.
2. Heat transfer principle of molybdenum strip
The heating characteristics of molybdenum strip are closely related to the principle of heat transfer. In the design of the molybdenum belt furnace, the molybdenum belt is usually located above or below the material in the furnace, or surrounded by the material. When the molybdenum strip is heated, the heat is transferred to the material in the furnace in three main ways:
Conduction: This is the most common form of heat transfer, where heat is transferred from the heated molybdenum strip to the material adjacent to the molybdenum strip through contact. The material is directly in contact with the molybdenum strip, and the heat is transferred to the material through the molecular vibration in the molybdenum strip, which causes it to heat up.
Convection: molybdenum strip heating will heat the gas in the furnace, resulting in the flow of hot air. The circulation of hot air in the furnace will evenly transfer heat to the material, thus accelerating the heating of the material.
Radiation: Molybdenum belt will radiate heat energy at high temperatures, especially at high temperatures, molybdenum belt through the form of electromagnetic waves to transfer heat to the surface of the material. The radiation heat transfer efficiency is high, especially in vacuum or low pressure environment.
These three heat transfer modes interact so that the material in the furnace can quickly and evenly obtain heat, thereby improving the overall heating efficiency.
3. Temperature control principle
The temperature control principle of molybdenum foil furnace is based on a modern temperature control system, and the temperature in the furnace is accurately adjusted to ensure that the material can be processed in a suitable temperature environment under different process requirements. Temperature control system usually consists of temperature sensor, controller and heating circuit:
Temperature sensors: Molybdenum belt furnaces are usually equipped with high-precision temperature sensors (such as thermocouples or infrared thermometers), which can monitor temperature changes in the furnace in real time. Through the feedback temperature information, the controller can determine whether the current temperature meets the set requirements.
Controller: Based on feedback from the sensor, the controller can adjust the current level. If the furnace temperature is lower than the set value, the controller will increase the current through the molybdenum strip to increase its heat output; If the temperature is too high, the controller will reduce the current and reduce the heat generated by the molybdenum strip. This precise temperature control ensures that the furnace temperature fluctuates within a stable range and is suitable for various heat treatment processes.
Program control: the temperature control system of modern molybdenum foil furnace often has a programming function, the user can preset multiple temperature stages and holding time, the system will automatically adjust the temperature according to the program, to achieve complex heating and cooling process.
Mosten Alloy can produce molybdenum sheet, molybdenum block, molybdenum foil, molybdenum rod, molybdenum wire, molybdenum cup, molybdenum processing workpiece according to customer demand.