• industrial neodymium magnet china
          Empowering you with magnet solutions

          For tech companies who use neodymium magnets in their innovative products, our know-how in magnet engineering and manufacturing speeds up your project success.

          Permanent Magnets

          Find high-performance magnets for diverse applications, supported by our expert knowledge and dedication to quality.

          Magnetic Assemblies

          Discover custom-designed, high-performance assemblies for various applications, backed by our expertise and commitment to precision and reliability.

        • Jonah Jin

          As the Managing Director of Tengye, I bring a wealth of knowledge and experience to the table, with expertise spanning sales, technical aspects, purchasing, and more. My all-around proficiency in the world of magnets and magnetic assemblies ensures that I can provide comprehensive solutions to meet our clients’ diverse needs. 

          Through my commitment to sharing industry insights and innovations in our blog, I aim to establish a strong foundation of trust and transparency between our valued customers and myself. Rest assured, at Tengye, your magnetic solutions are in capable and experienced hands.

  • Contact

AlNiCo Magnets

magnet grade
Alnico magnets
Cast Alnico - table of magnetic properties
Cast Alnico - table of magnetic properties

Introduction of AlNiCo Magnet

AlNiCo, short for aluminum-nickel-cobalt, represents a group of permanent magnet alloys primarily composed of iron, aluminum, nickel, and cobalt. Its inception dates back to 1931 when T. Mishima in Japan discovered its superior coercivity compared to existing steel magnets. Alnico alloys typically consist of 8-12% aluminum, 15-26% nickel, 5-24% cobalt, up to 6% copper, up to 1% titanium, and the remaining balance is iron.

Diverse magnetic properties are achieved in Alnico by modifying the composition and manufacturing process. Specialized casting techniques, such as those used in the production of Alnico 5-7, impart unique crystalline grain orientation.

Alnico held the distinction of being the strongest permanent magnet until the emergence of rare earth magnets in the 1970s. While it has been substituted in many applications, Alnico’s temperature stability and its ability to withstand high temperatures up to 500°C make it indispensable in specific use cases.

Design Considerations

To ensure the stability of Alnico magnets, it is crucial to design the magnet system with a high permeance coefficient, placing the working point above the knee of the J-H curve due to the low coercivity of Alnico. For instance, an Alnico 5 rod should have a length greater than five times its diameter.

Careless handling can easily demagnetize Alnico magnets, so it is advisable to magnetize them after assembly to prevent unintended demagnetization.

Alnico magnets exhibit remarkable temperature stability, making them ideal for temperature-sensitive applications. They experience minimal variation in output with temperature changes. The reversible temperature coefficient of induction is -0.02%/°C from ambient, while the reversible temperature coefficient of intrinsic coercivity is +0.01%/°C from ambient. This makes Alnico magnets an excellent choice for performance-critical applications, including medical and military sectors. Remarkably, Alnico magnets can be used at temperatures up to 530°C without irreversible losses in magnetizing.

At Tengye, we empower tech companies and product designers with premium magnets and electrical/electronic components. With our technical innovation and exceptional service, we are your reliable partner for success. Backed by ISO 9001 and IATF 16949 certifications, we guarantee the highest quality standards. Contact us to explore comprehensive solutions and elevate your projects.

Related Products:

Tell us your project by filling out this inquiry form or send us an Email, we will get back to you within 24 hours.

Your information will be kept strictly confidential.
Jonah Jin

Jonah Jin
Managing Director

Every customer deserves to be treated professionally and responsively.