Sintered NdFeB Magnets

Neodymium Magnets 06/28/2021

sintered NdFeB magnets

Study of high coercivity sintered NdFeB magnets

NdFeB magnets with excellent properties, especially high-coercivity sintered NdFeB magnets, have extensive applications in the field of permanent magnet motors ...

Magnetic powders for sintered NdFeB magnets have been prepared by using an advanced processing method including strip casting, hydrogen decrepitation, jet milling, and rubber isotropic press.

The effects of Dy, Ga, and Co addition on the microstructure and magnetic properties of sintered magnets have been investigated.

By adopting a suitable component ratio and adjusting proper technological parameters, we have prepared high-coercivity sintered NdFeB magnets with hard magnetic properties of jHc=25.6 kOe, Br=13.2 kG, and (BH)max=39.9 MGOe.

The temperature coefficient of coercivity of the magnets (between 20 and 150 °C) is –0.53%/°C.

The magnetic properties at high temperatures satisfy the needs of permanent magnet motors.

sintered NdFeB

The toughness of Sintered NdFeB Magnets

The failure mechanism of sintered NdFeB magnets was studied from the view of the fracture model and fracture mechanism, and the effect of alloying on strength ...

The failure mechanism of sintered NdFeB magnets was studied from the view of the fracture model and fracture mechanism, and the effect of alloying on the strength and toughness of the magnets was researched too.

The results showed that intercrystalline fracture was the main fracture model and cracks elongated along with the interface between 2–14–1 phase and Nd-rich phase.

Generally, the methods for improving toughness include enhancing bond strength of the interface between the two phases mentioned just, refining grains of 2–14–1 phase, and increasing the number of particles of Nd-rich phase localized at the grain boundary.

The fracture model of the Nd15.5Fe76.5Al1Ti0.5B6.5 magnets was trans crystalline cleavage fracture, whose value of fracture toughness increased about 30% compared to that of the Nd15.5Fe78B6.5 magnets.

Otherwise, the value of fracture toughness of the magnets with a proper amount of addition of Ag increased about 70% compared to that of the Nd15.5Fe78B6.5 magnets.

Moreover, the two sorts of modified magnets mentioned just could be drilled successfully.

In addition, the development of the research about increasing the strength and toughness of sintered NdFeB magnets is reviewed in this article.

Magnetic Force Microscopy of Sintered NdFeB

... the observed magnetic structures, and influence of the sample stray field on tip magnetization. We have used sintered NdFeB-type materials to examine these ...

The use of magnetic force microscopy (MFM) for the characterization of permanent magnet samples offers moderate-to-high resolution data with minimal sample preparation.

The technique yields contrast mapping of the magnetic stray field distribution above the sample surface.

Necessary considerations include interpretation of the stray field data to yield domain structures, the influence of the topography on the observed magnetic structures, and the influence of the sample stray field on tip magnetization.

We have used sintered NdFeB-type materials to examine these aspects of MFM.

sintered NdFeB magnets Physical Property

Sintered NdFeB magnets (sintered neodymium iron boron magnets) are manufactured through a powder metallurgy process. First, the smelted alloy needs to be powdered and pressed into a compact in a magnetic field, and then the compact is sintered in inert gas or vacuum to achieve densification.

The magnet blank can be produced after sintering, and then it can be turned into magnets of various shapes through mechanical processing (such as wire cutting, slicing, grinding, etc.).

NdFeB magnets are based on a Nd-Fe-B tetragonal crystal structure, normally as Nd2Fe14B.

The neodymium element can be replaced by a portion of other rare earth elements including praseodymium (Pr), dysprosium (Dy), terbium (Tb), cerium (Ce), etc.

The iron element can be replaced by a portion of cobalt (Co) element to increase the magnets’ Curie temperature (Tc), thermal stability, and corrosion resistance.

We also adds a small portion of other metal elements including aluminum (Al), copper (Cu), niobium (Nb), gallium (Ga), etc to control the microstructure and the microchemistry.

Sintered NdFeB magnets have high processing costs, large loss during processing, and relatively poor dimensional accuracy compared with bonded NdFeB magnets. But its advantage is also obvious. At present, the (BH) max of sintered NdFeB magnet can reach more than 50M, while the bonded magnet is generally below 10M. Sintered NdFeB permanent magnets are widely used in electronics, electrical machinery, medical equipment, toys, packaging, hardware machinery, aerospace, and other fields.

Sintered NdFeB Magnets’ Grades and Their Magnetic Properties

NdFeB Grade N35~N52

Sintered NdFeB

Magnet Applications Sintered Neodymium Boron magnets offer engineers the ideal combination of low-cost and high-energy products.

We offer a wide range of grades to allow for optimal selection for the magnet’s operating environment.

Operating in concert with state-of-the-art facilities around the world, Magnet Applications can meet any requirement.

From high-value, cost-conscious products from the USA, to more exotic grade materials from Japan, to domestically manufactured finished products in any quantities – We are your Total Magnetic Solution!

Full local support at extremely competitive prices

Wide product offering, including high-temperature grades up to 50 MGOe

Capabilities for full assembly in local market

Rapid prototyping and production start-up

High energy NdFeB magnets and their applications

In sintered NdFeB magnets, additive elements for increasing coercivity decrease residual magnetization. Also, fine magnetic powder.

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