Techtalk

Surface Treatment

Surface Treatment of Neodymium Magnet

Samarium Cobalt magnet has excellent chemical stability and enabled for most applications without any surface treatment. Surface protective treatment is a necessary procedure for the Neodymium magnet, especially sintered Neodymium magnet. Sintered Neodymium magnet possesses multi-phase microstructure and consists of Nd2Fe14B main phase, Nd-rich phase, and B-rich phase. Nd-rich phase exhibit very strong oxidation tendency [...]
Hot pressed magnet featured

Some Introduction to Hot Pressed Magnet

The (BH)max value gap between bonded Neodymium magnet and sintered Neodymium magnet is relatively huge, then high abundant rare-earth permanent magnet and hot pressed magnet have long been considered as the effective solution to fill this gap. Manufacturing process of hot pressed Neodymium magnet is significantly different from bonded Neodymium magnet and sintered Neodymium magnet. [...]
SmFeN Magnet featured

Some Introduction to SmFeN Magnet

SmFeN magnet, also known as Sm2Fe17N3, has always been expected as a potential option for next generation of permanent magnetic material, thus attracted many attentions since its discovered by Michael Coey in 1990. SmFeN has many advantages, include: The curie temperature can reach 476 degrees Celsius which much higher than conventional sintered Neodymium magnet. Magnetocrystalline anisotropy field is [...]
Curie Temperature featured

The Difference between Maximum Working Temperature and the Curie Temperature

Magnet consumers are often confused the definitions of Max. Working Temperature Tw and the Curie Temperature Tw of the permanent magnet. In reality, Max. Working Temperature and the Curie Temperature Tc are two totally different conceptions. Magnetism behavior of material can be classified into ferromagnetism, ferritemagnetism, anti-ferromagnetism, paramagnetism, and diamagnetism, then permanent magnet is definitely [...]

Brief Introduction of Bonded AlNiCo Magnet

Brief Introduction of Bonded AlNiCo Magnet According to the type of raw magnetic powder, the bonded magnet can be divided into bonded NdFeB magnet, bonded ferrite magnet and bonded SmCo magnet in normal circumstance. Have you ever heard the bonded AlNiCo magnet before? The raw material of bonded AlNiCo magnet: Based on the standard specifications […]

Orientation Technology of Anisotropic Injection Magnets

What’s the difference between the isotropic magnet and anisotropic magnet? Isotropic magnet’s crystal grains do not have their easy magnetization direction lined up in a specific direction and whose magnetic characteristic is isotropic. On the other hand, a magnet whose crystal grain directions are aligned and have their easy magnetization direction lined up is called an […]

How different magnetics parameters affects permanent magnet (PM) motor

How to measure the magnetic properties of magnet? Almost all magnet manufacturers use B-H curve testing equipment to get the demagnetization curve of magnet. This method is a closed circuit measurement, and an uniform cross-section sample is clamped between the faces of electromagnet. The testing sample is usually cut from the magnet. The magnetic properties […]

Magnet Thermal Aging

What is magnet thermal aging? Even though we usually say “permanent magnet”, but magnets do not remain magnetism permanently. In general, permanent magnets are gradually demagnetized by the impact of heat variations. This behavior of magnet can be determined by total flux change over time for a given temperature, also known as “flux loss”. What [...]