China Neodymium And Ferrite Magnets Manufacturer & Supplier 
When it comes to AlNiCo magnets, I think many people may have never heard of them, mainly because this type of magnet is rarely used in everyday life. Since we have little contact with them, it is natural that we know little about them. Today, this article will focus on discussing the pros and cons of AlNiCo magnets.
Before we dive into the details, let's take a look at a pictures of its appearance.
Pro 1: High operating temperature
Aluminum-nickel-cobalt permanent magnet materials are renowned for their exceptional high-temperature stability, with an operating temperature range spanning from -60°C to +500°C. Certain grades, such as AlNiCo 8, can even maintain stable magnetic properties at temperatures exceeding 550°C. This is due to their high Curie temperature (700–860°C), which is significantly higher than that of ferrites (approximately 450°C) and neodymium-iron-boron magnets (310–350°C), making them less prone to demagnetization in high-temperature environments.
In high-temperature applications, the remanence (Br) and magnetic energy product (BHmax) of aluminum-nickel-cobalt change relatively little with temperature, outperforming most permanent magnet materials. For example, at 300°C, its magnetic flux loss is typically less than 10%, while neodymium-iron-boron may completely fail at that temperature.
Pro 2: Strong corrosion and oxidation resistance
The surface of aluminum-nickel-cobalt alloys easily forms a dense oxide film (such as aluminum oxide), which effectively resists corrosion from the atmosphere, humid environments, and general chemical media, eliminating the need for additional surface coatings (such as zinc or nickel coatings typically required for corrosion protection in neodymium-iron-boron alloys).
Pro 3: Good processing performance
AlNiCo magnets can be formed through casting, sintering, or machining, especially cast aluminum-nickel-cobalt, which can be made into complex-shaped permanent magnets to meet special design requirements. For example, precision casting technology can be used to directly produce motor rotor magnets with tooth slots, reducing subsequent processing steps.
There are advantages, but there are also disadvantages. You also need to know the following disadvantages.
Con 1: Low coercive force and weak resistance to demagnetization
The intrinsic coercivity (Hci) of aluminum-nickel-cobalt is typically only 40–160 kA/m, which is much lower than that of neodymium-iron-boron (up to 800–1500 kA/m) and ferrite permanent magnet materials. This means that it is easily demagnetized by external strong magnetic fields, mechanical vibrations, or high temperatures.
Con 2: High density and weight
Alloys with high proportions of metals such as cobalt and nickel have densities ranging from 7.3 to 8.3 g/cm³, which is approximately 1.1 times that of neodymium-iron-boron (7.5 g/cm³) and 1.5 times that of ferrite (4.5 to 5.1 g/cm³).
Con 3: High cost
Cobalt is the core component of aluminum-nickel-cobalt, and its high mining costs and price volatility make the material cost of aluminum-nickel-cobalt much higher than that of ferrite and neodymium-iron-boron. In large-scale industrial applications, this cost disadvantage is even more pronounced.
The above are the 3 advantages and 3 disadvantages of aluminum-nickel-cobalt magnets. We hope this information will help you understand more about magnets.
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