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What Temperature Do Neodymium Magnets Lose Their Magnetism?

Neodymium magnets are one of the most sought-after magnets in the world today. Their demand has had an exponential rise over the past decades, and it seems that there will be a greater demand in the future. The uses of neodymium magnets vary but mostly, they’ve been used in manufacturing and heavy-load types of machinery. Thus, it is important to know how a neodymium magnet functions, and what components they possess. Here, we will talk about the temperature at which neodymium magnets lose their magnetism.

What are neodymium magnets?

Neodymium magnets, also known as NdFeB magnets or Neo magnets, are a type of rare earth magnet made from an alloy of neodymium, iron, and boron. They are the most powerful type of permanent magnet currently available, and they are widely used in a variety of applications due to their strong magnetic field and relatively small size.

Neodymium magnets are made through a process called powder metallurgy. This process involves mixing neodymium, iron, and boron powders together to form a homogeneous mixture. The mixture is then pressed into a mold and heated to a high temperature in a furnace. The heat causes the powders to react and form a solid mass. Once the magnet has cooled, it is ground and polished to its final shape. The magnet is then coated with a protective layer to prevent corrosion.

The properties of neodymium magnets are determined by the proportions of neodymium, iron, and boron in the alloy. The neodymium provides the magnetic field strength, while the iron helps to hold the field in place and the boron improves the magnetic stability. The resulting alloy is sintered or heated and compressed, to form a solid magnet.

Neodymium magnets are typically graded by their maximum energy product, which is a measure of the magnetic field strength and density. The higher the maximum energy product, the stronger the magnet. These magnets can range in grade from N35, which has a maximum energy product of 35 megagauss-oersteds (MGOe), to N52, which has a maximum energy product of 52 MGOe. This makes them ideal for applications that require a strong magnetic field, such as motors and generators. The grade of a neodymium magnet also determines its magnetic properties, as well as its price and availability.

Neodymium magnets are known for their strong magnetic field and small size. They are typically smaller and lighter than other types of magnets with the same magnetic strength, making them ideal for use in applications where size and weight are important factors. They are also relatively inexpensive and easy to manufacture, which makes them popular for use in a wide range of applications.

Some common applications for neodymium magnets include motors and generators, speakers, headphones, and microphones, as well as medical equipment, scientific instruments, and consumer electronics. They are also used in the aerospace and automotive industries, as well as in construction and manufacturing.

One of the main advantages of neodymium magnets is their high magnetic field strength. They are capable of generating a magnetic field that is much stronger than that of other types of magnets, which makes them ideal for use in applications where a strong magnetic field is required. This makes them useful for applications such as magnetic resonance imaging (MRI) machines, which rely on strong magnetic fields to create detailed images of the inside of the body.

Neodymium magnets also have a high resistance to demagnetization, which means they are less likely to lose their magnetic properties over time. This makes them ideal for use in applications where the magnet needs to maintain its strength over a long period of time.

There are a few drawbacks to using neodymium magnets. One of the main drawbacks is that they are brittle and can break or shatter if they are subjected to high impacts or if they are handled improperly. They are also sensitive to temperature, and their magnetic properties can be affected by extreme temperatures. In addition, neodymium magnets can corrode if they are exposed to moisture or other corrosive substances.

Despite these drawbacks, neodymium magnets are widely used due to their strong magnetic field and small size. They are an important component in many different types of products and have a variety of applications in a range of industries.

Where are they most commonly used?

One of the most common uses of neodymium magnets is in motors and generators. The strong magnetic fields produced by these magnets allow them to generate high levels of torque, making them ideal for use in electric motors, generators, and wind turbines. In electric motors, neodymium magnets are used to create a rotating magnetic field, which drives the motor. In generators, the magnets are used to generate electricity by converting mechanical energy into electrical energy.

Another common use for neodymium magnets is in speakers and headphones. The strong magnetic fields produced by these magnets allow them to move the diaphragm of a speaker back and forth, creating sound waves. In headphones, the magnets are used to move the diaphragm of the earpiece, which generates sound waves that are then transmitted to the ear.

Neodymium magnets are also used in sensors, such as Hall effect sensors, which are used to measure magnetic fields. These sensors are used in a wide range of applications, including automotive systems, industrial control systems, and consumer electronics.

These magnets are also used in the medical field wherein they are most utilized in magnetic resonance imaging (MRI) machines. MRI machines use strong magnetic fields to produce detailed images of the inside of the body. The neodymium magnets used in these machines are typically encased in a cryostat, which keeps them at extremely low temperatures to maintain their strength.

In addition to these uses, neodymium magnets are also used in a wide range of other applications, including in the construction of scientific instruments, such as mass spectrometers and particle accelerators. They are also used in the manufacture of computer hard drives, and in the production of consumer products, such as toys and refrigerator magnets.

At what temperature do neodymium magnets lose their magnetism?

As mentioned above, NdFeB magnets are sensitive to temperature. The temperature at which neodymium magnets lose their magnetism, known as the Curie temperature, depends on the specific composition of the magnet. In general, however, the Curie temperature of neodymium magnets is between 310 and 370 degrees Celsius (590 and 700 degrees Fahrenheit).

At temperatures below the Curie temperature, neodymium magnets retain their full magnetic strength. As the temperature increases and approaches the Curie temperature, the magnetism of the material will start to decrease. Once the temperature reaches the Curie temperature, the magnet will lose all of its magnetism and will no longer be able to generate a magnetic field.

It is important to note that the Curie temperature of neodymium magnets can be affected by various factors, such as the purity and quality of the raw materials used to make the magnet, the manufacturing process, and the size and shape of the magnet. As a result, the exact Curie temperature of a neodymium magnet may vary from one magnet to another.

In addition to the Curie temperature, neodymium magnets can also be demagnetized by other means, such as exposure to high levels of vibration or shock, or by being subjected to strong alternating magnetic fields. Demagnetization can also occur if a neodymium magnet is overheated for an extended period of time, even if the temperature does not reach the Curie temperature.

It is important to handle neodymium magnets with care to avoid damaging them and to ensure that they maintain their full magnetic strength. This includes keeping them away from high temperatures, avoiding strong impacts, and protecting them from exposure to strong alternating magnetic fields.

In summary, the temperature at which neodymium magnets lose their magnetism is known as the Curie temperature, and it is generally between 310 and 370 degrees Celsius. However, the exact Curie temperature of a neodymium magnet can vary depending on various factors, and the magnet can also be demagnetized by other means such as vibration, shock, or exposure to alternating magnetic fields.

Conclusion

Overall, neodymium magnets are versatile and useful materials that have a wide range of applications in a variety of industries. From motors and generators to speakers and headphones, to scientific instruments and consumer products, these magnets are an essential component of many modern technologies.

Despite their many advantages, neodymium magnets do have some limitations. They are prone to corrosion and can lose their magnetic strength over time if they are not properly coated or protected. They are also brittle and can break or shatter if they are subjected to too much stress. Therefore, it is important to consult with knowledgeable suppliers, and if possible, those experienced in handling neodymium magnets. ROBO Magnetic is one of the leading suppliers of neodymium magnets. They manufacture, export, and even make custom NdFeB magnets to the needs and wants of a client.  For more information, visit www.robomagnetic.com.

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Article by

ROBO Magnetic Product Team

We are the manufacturer with 16 years of experience in custom neodymium magnets.

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