Electric heating elements are a preferred option for many heat treaters, with a wide range of shapes, sizes and materials available. Among the most popular are MoSi2 heating element and Silicon Carbide(SiC) heating elements, which are extensively used in heat-treating industries for high temperatures, maximum power and heavy-duty cycles.
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Thermal Elements
molybdenum disilicide (MoSi2) heating element
Item Number : KT-MH
silicon carbide(SiC) heating element
Item Number : KT-SH
MoSi2 heating element
MoSi2 Heating element is a High-Density Material consisting of Molybdenum Disilicide and self-forming glaze of silicide dioxide. It can be used up to Furnace Temperature of 1800℃. These elements have a long service life.
MoSi2 Heating element is a special material that has the best properties of both ceramic and metallic materials. It withstands corrosion and oxidation, like ceramic materials and has a low thermal expansion. And it also has good thermal and electrical conductivity, like metallic materials. Thermal shock does not have any effect on the element and as a heating element, it can withstand many years of service because of its strength.
MoSi2 heating elements come in a variety of sizes and shapes, with both straight and bent options. The most popular design is the "U"-shaped element with two shanks, which is welded to terminals with double the diameter of the heating zone. This element can be bent at 45° or 90° angles in either the heating zone or terminals.
Silicon Carbide(SiC) heating elements
A silicon carbide (SiC) heating element is a chemically stable material with low thermal-expansion and deformation tendencies. Typically, it is an extruded tubular rod or cylinder made from high-purity grains of SiC, fused together by either reaction-bonding or recrystallization processes at temperatures exceeding 3900°F (2150°C).
Recrystallization forms fine grains of SiC, acting as conductive pathways between larger grains. The number of bridges formed determines the material’s resistance, and controlling this process is crucial for creating a good heating element with consistent electrical resistance.
The lifespan of a SiC heating element depends on factors such as furnace atmosphere, watt density, operating temperature, type of service (continuous or intermittent), maintenance, furnace type, design, and loading. SiC heating elements are versatile and can operate in air up to 3000°F (1650°C).
KinTek heating elements
Looking for a reliable and efficient heating elements solution? Look no further than Kintek heating elements! Our high-quality heating elements are engineered to provide long-lasting and consistent performance, making them ideal for a wide range of applications.
FAQ
What is a thermal element?
A thermal element is a device that converts electrical energy into heat in order to raise the temperature of an object or space. There are several types of thermal elements, including tubular heating elements, radiative heating elements, and combination heating element systems. Heat transfer occurs through thermal resistance and thermal capacitance, and there are three sources of heat: a power source, a temperature source, and fluid flow. Thermal elements are commonly used in laboratory equipment, as well as in various domestic and industrial applications.
How does a thermal element work?
A thermal element works by converting electrical energy into heat through the process of Joule heating. When an electric current flows through the element, it encounters resistance, and this results in heating of the element. Metal and ceramic heating elements operate on the principle of electric resistance heating, generating heat by resisting the flow of electricity through the material. The coefficient of electrical resistance of the material determines its ability to generate heat proportional to the amount of current flowing through it. The generated heat radiates outwards into the heat treatment chamber, making thermal elements a highly effective method of generating heat.
What are the advantages of using thermal elements?
Thermal elements offer several advantages in temperature measurement. Firstly, they have a wide temperature range, allowing for accurate measurements across a broad spectrum, from extremely low temperatures to high temperatures. They also have high sensitivity, meaning they can detect even small temperature changes. Additionally, thermal elements have excellent stability and repeatability, providing reliable and consistent temperature readings over time. They are rugged and durable, making them suitable for use in harsh environments. Thermal elements can also be easily integrated into various systems and instruments for temperature monitoring and control.
What are the different types of thermal elements?
There are several types of thermal elements, including thermocouples, resistance temperature detectors (RTDs), and thermistors. Thermocouples are made of two dissimilar metals joined together, and they generate a voltage proportional to the temperature difference between their junctions. RTDs are made of pure metals, such as platinum or copper, and their resistance changes with temperature. Thermistors are made of temperature-sensitive semiconducting materials and have a large change in resistance with temperature.
How should thermal elements be calibrated and maintained?
Calibration and maintenance of thermal elements are crucial to ensure their accuracy and reliability. Regular calibration should be performed using certified reference thermometers or temperature standards to verify the accuracy of temperature readings. Calibration intervals may vary depending on the application and industry requirements. Proper storage and handling of the thermal elements are important to prevent damage or contamination. It is recommended to protect the elements from extreme temperatures, moisture, and corrosive substances. Regular inspection of the element's connections, insulation, and protective sheaths should be carried out, and any damage or wear should be addressed promptly. Proper cleaning of the elements, if required, should be done following manufacturer guidelines. It is important to follow the manufacturer's recommendations for maintenance and consult with experts when necessary.
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