See online people ask the temperature characteristics of ferrite and temperature coefficient (when the temperature changes every 1 ℃ when the percentage of reversible change in magnetic properties known as the temperature coefficient of magnetic materials), today this article to give you an introduction.
Ferrite magnets have a positive endowed coercivity temperature coefficient (which varies by +0.27% / degree Celsius relative to ambient), and only ferrite expresses this property so much. However, the magnetic output decreases with increasing temperature (it has a negative induced temperature coefficient of -0.2% / degree Celsius). The end result is that ferrite magnets can be used at high temperatures with little or no problems.
The temperature coefficient of remanent magnetism refers to the degree to which the magnetic properties of a permanent magnet ferrite change with temperature. Generally speaking, the magnetic properties of a permanent magnet ferrite decrease with increasing temperature, which is called the negative temperature coefficient. The temperature coefficient of remanent magnetism of permanent magnet ferrite is usually between -0.10%/°C and -0.02%/°C in the temperature range of 0°C to 80°C, depending on the material composition and process preparation. It should be noted that as the temperature increases, the rate of decrease in the magnetic properties of permanent magnet ferrites slows down, so the remanent magnetization temperature coefficient usually only has a large effect on practical applications at large temperature variations.
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The coercivity temperature coefficient is used to measure the degree of coercivity of permanent magnet ferrite with the change of temperature, coercivity refers to the magnet's ability to maintain its own magnetization state without the action of external magnetic field, which is one of the important properties of permanent magnet ferrite. Similar to the temperature coefficient of remanent magnetization, the coercivity of permanent magnet ferrite generally shows a negative temperature coefficient. In the temperature range of 0℃ to 80℃, the coercivity of permanent magnet ferrite is usually between -0.30%/℃ and -0.05%/℃. It should be noted that the coercivity is more sensitive to temperature than the remanent magnetization, so that at high temperatures, the coercivity of permanent magnet ferrites may be reduced to the point where it cannot be maintained for the application.
Ferrite magnets can be used at temperatures up to +250 degrees Celsius (and in some cases up to +300 degrees Celsius), making them ideal for electric motors and most high temperature applications. At temperatures below zero, for example, below -10 to -20 degrees Celsius, ferrite magnets may begin to exhibit reduced tensile strength. That said, the temperature and degree of degradation depends on the shape of the magnet and is application specific. In most applications, the operating temperature is not high enough to produce this effect.
The above is about the temperature characteristics and temperature coefficient of ferrite magnet introduction, edited by China neodymium magnet manufacturer Courage Xiao Fu, if you need to buy this kind of magnet can contact our company for your quotation, large, small, thin, multi-pole can be processed.
Introduction of ferrite knowledge;