Neodymium magnets: new solutions and working at high temperatures?

What are the challenges associated with the corrosion of neodymium magnets and what are the solutions?

Neodymium magnets are susceptible to corrosion, especially in normal temperature and humidity conditions. The solution is high corrosion-resistant magnets produced in vacuum conditions with additional coatings. They withstand up to 500 hours in salt spray tests, which is significant in marine applications.

How long does a neodymium magnet last?

A neodymium magnet retains its strength for over 100 years, losing about less than 1% of its strength annually without losing its magnetic properties - if stored in a dry, low-humidity environment and room temperature of about 20°C.
Neodymium magnets are less resistant to external factors compared to ferrite magnets, losing magnetization at a temperature of 80°C. They are produced by pressing powdered metals (neodymium, iron, boron) and covered with nickel and copper coatings, making them prone to cracking and crumbling. To ensure these magnets serve for many years, avoid exposing them to impacts, moisture, chemical agents, and high temperature.

What are the different types of coatings for neodymium magnets and what properties do they have?

There are several types of coatings for neodymium magnets, including:

Nickel plating (Ni+Ni): Thickness 10-20 µm, silver color, excellent resistance to moist environments, maximum operating temperature up to 200°C.
Zinc plating (Blue Zn): Thickness 8-20 µm, silver-blue color, good resistance to salt sprays, maximum operating temperature up to 160°C.
Passivation: Thickness 0.1-0.3 µm, silver-gray color, provides temporary protection, maximum operating temperature up to 240°C.

What are the main features of N52 and N55 magnets?

N52: Maximum energy product (Bh max) exceeds 400 KJ/m³ (50-53 MGOe).
N55: A newer grade offering even higher magnetic properties, exceeding 400 KJ/m³.

At what high temperatures can the new neodymium magnet alloys operate?

New neodymium magnet alloys, such as N30AH, N33AH, N35AH, N38AH, can operate at temperatures up to 240°C, making them suitable for applications in extreme thermal conditions.

What is the role of dysprosium in neodymium magnets and what are the alternatives for magnets with high dysprosium content?

Dysprosium is added to neodymium magnets to enhance their performance in high temperatures and improve resistance to demagnetization. In response to limited availability and high prices of dysprosium, magnets with low dysprosium content have been developed, retaining good magnetic properties.

Where else can neodymium magnets be applied?

Neodymium magnets have a wide range of applications, including in electronics (sensors, hard drives), the automotive industry (DC motors, power steering), medicine (MRI equipment, scanners), clean energy technologies (wind turbines, improving water flow), and in industrial magnetic separators used in recycling and quality control.

As you can see, neodymium magnets are incredibly versatile and powerful tools that find use in many diverse industries, from medicine to engineering. Their unique properties, such as high corrosion resistance, the ability to operate at high temperatures, and impressive magnetic strength, make them indispensable in modern technologies. Whether you need neodymium magnets for industrial, commercial, or even hobbyist applications, we have a wide range of products that will meet your expectations.

Ready to discover the power of neodymium magnets?

We invite you to visit our main page at neodymium magnets, where you will find a wide selection of neodymium magnets in various shapes - from cylindrical, through plate, to ring magnets and many others. Each magnet has been designed with specific needs and requirements in mind. Don't wait, make sure your project or device has the best possible magnetic components – choose neodymium magnets today!