What is the difference between carbon fiber and tungsten wire when used as a heating wire for infrared heating tubes?

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Recently, many people have been asking "What is the difference between tungsten wire infrared heating tubes and carbon fiber infrared heating tubes?" Today, let's take a look at the differences between these two types of infrared heating tubes.


Tungsten wire infrared heating and carbon fiber infrared heating tubes have many similarities. Both use quartz tubes to provide a vacuum or inert gas environment outside; After being powered on, both will emit infrared radiation, which heats the object; Both can be made into heating tubes of different shapes according to the drawings; Both can be replaced with ruby quartz tubes, semi plated white quartz tubes, gold plated quartz tubes, etc. The main differences between the two are the material of the heating wire and the presence or absence of instantaneous current during use.


Below are the differences between the two.


1The heating wire material is different, one is tungsten wire and the other is carbon fiber.


The tungsten wire infrared heating tube uses tungsten wire as the heating wire. Tungsten wire is mainly used as a heating wire (filament) in incandescent lamps and halogen tungsten lamps. Tungsten wires used as various luminescent materials in light bulbs also require the addition of a small amount of potassium, silicon, and aluminum oxides during the smelting process. The resistivity of tungsten wire is 5.3 * 10^-8. Tungsten has a high melting point, high resistivity, good strength, and low vapor pressure, making it the best material for making heating wires (filaments) in metals. When the current is heated to a certain temperature through the tungsten wire, the resistance value of the tungsten wire also increases to a certain value (generally, the resistance value of the metal wire increases with the increase of temperature).


The heating wire of the carbon fiber infrared heating tube is made of carbon fiber. Edison also attempted to use carbon fiber as the filament when inventing incandescent lamps, but chose tungsten filament due to the outdated production and manufacturing level at that time. Carbon fiber is a non-metallic material with stable physical and chemical properties. Carbon fiber is a special type of fiber mainly composed of carbon elements, and its carbon content varies with different types, generally exceeding 90%. Carbon fiber has the characteristics of ordinary carbon materials, such as high temperature resistance, friction resistance, conductivity, thermal conductivity, and corrosion resistance. However, unlike ordinary carbon materials, its appearance is significantly anisotropic, soft, and can be processed into various fabrics, exhibiting high strength along the fiber axis. Carbon fiber has a small specific gravity, therefore it has a high specific strength.


2、The instantaneous starting current is different. The tungsten wire infrared heating tube has an instantaneous impact current, while the carbon fiber heating tube does not.


The electric heating wire of the tungsten wire infrared heating tube is a metal tungsten wire, and the resistance coefficient of the metal is closely related to temperature. Therefore, the cold resistance of the tungsten wire infrared heating tube differs significantly from the resistance during operation. When starting the heating tube specification, due to the small resistance of the heating wire, the instantaneous current passing through the circuit will be relatively large, usually 1.5 times the rated current. However, the data from university laboratories shows that the peak instantaneous current is about 10 times the rated current. So when using tungsten wire infrared heating tubes, the rated current value of the electrical components of the circuit needs to be appropriately higher than the calculated value.


The electric heating wire of the carbon fiber infrared heating tube is carbon fiber, and the resistance coefficient of carbon fiber is not highly correlated with temperature. The cold state resistance of carbon fiber measured in university laboratories is about 45% higher than that during normal operation. Simply put, the power of the carbon fiber heating tube is less than the rated power at the moment of start-up, and the heating tube reaches the rated power after about 5 seconds. So circuit components using carbon fiber infrared heating tubes do not need to reserve a rated current value, which can reduce some equipment costs.


Do everyone understand?


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