Injection molded magnets are made by injecting the special compound, a mixture of Nd magnet powder and high performance polymer, into the mold. These magnets cover a wide range of characteristics as isotropic bonded magents, including heat resistance and higher performance. Injection molding offers very flexible shape design as well as overmolding and insert molding [...]
Isotropic polymer bonded NdFeB magnets - The raw material powder is manufactured by rapid quenching of prescribed alloys into nanocristalline flakes which are subsequently annealed for optimum magnetic properties. Shortly after the invention of rapidly quenched NdFeB magnet powders, MPCO had started to develop polymer bonded magnets from these powders. Isotropic polymer bonded NdFeB [...]
Ion Vapor Deposition (IVD) Aluminum Coating Magnet Introduction of aluminum coating magnet From the perspective of anti-corrosion and mechanical strength, the aluminum coating is an ideal choice for NdFeB magnet. The superiorities of aluminum coating includes: The potential difference between aluminum and NdFeB substrate is very low, and could not be formed electrochemical corrosion. There [...]
The Brief Introduction about Magnetic Boiler Filter The central heating system is a relatively energy-efficient way to heat all of rooms in home. The central heating system of China quite different from other Western countries, and only the people north of the Qinling Mountain-Huaihe River Line can enjoy the central heating, so this line is [...]
Magnet Raw Material Trend 2016-2018 Pr-Nd Price Trend 2016-2018 Pr-Nd Price Trend Pr-Nd Price RMBx10000/ton, per week 2016-2018 Cobalt(Co) Price Trend 2016-2018 Cobalt(Co) Price Trend Cobalt(Co) Price RMBx10000/ton, per week MAGNET – COUNTERSUNK NDFEB MAGNET – BY COATING NDFEB MAGNET – SEW IN NDFEB MAGNET – ADHESIVE
Magnetic Extrusion Material: • Strontium ferrite in thermo-plastic binder. • Max operating temperature 176˚F • Forms a strong bond when paired with itself. • Magnetic on 1 face. Description of Magnetic ExtrusionS The magnetic extrusion is a strontium ferrite magnetic powder within a thermo-plastic binder that is extruded through a die to create a specific [...]
Permanent Magnets Markets and Devices / Applications Devices • Electromechanical machines and devices e.g. motors, generators, actuators • Acoustic transducers e.g. speakers, earphones, ringers • Mechanical force and torque devices e.g. holding, lifting, clutches • Microwave and ion beam control e.g. TWT’s, particle accelerators • Conversion of external stimuli to electrical signal e.g. sensors • DC field generation e.g. MRI Markets and Industries • Automotive and transportation • Industrial and commercial • Consumer products • Military and aerospace • Medical Permanent Magnets Markets and Devices Applications Sensors/Encoders Hall Effect Encoder for end of shaft applications. Available as either absolute or incremental encoders they can provide digital position, analog position, and quadrature speed outputs. Capable of rotational speeds over 20k RPM. Hall IC used for this application uses a diametrically magnetized magnet. Hall Effect through‐shaft encoder. Requires use of Hall IC capable of off‐axis sensing using multipole bonded magnet. Low cost, speed or position sensors typically seen in automotive applications – Cam position, crank position, engine speed, ABS. This type of sensor can be designed for either face or lateral sensing applications and may, in addition to the Hall IC, incorporate a magnet if sensing a metal target or a pole piece if sensing an encoder multipole magnet. What is the best permanent magnet material and process? •It depends; on the weight/space limitations, application operating conditions, operating parameters of the magnetic circuit, annual quantity, device assembly mechanization etc. • Despite have lower flux output bonded magnets can offer advantages over sintered magnets for many applications. • Despite lack of breakthrough in new materials over the last 30 years there are several promising developments in bonded magnets on the horizon. • [...]
Typical Compression Bonded Magnetic Properties Many suppliers publish specifications for a nominal 10 MGOe magnets with a minimum limit of 9 MGOe. Similar for a nominal 11 MGOe magnet; minimum limit is 10 MGOe. Have to design to lower limit of BHmax Typical Compression Bonded Magnetic Properties BHmax Improvement in Compression Bonded Magnets The BHmax of a compression bonded isotropic NdFeB magnet is influenced by the following two factors: 1. Volume fraction of magnetic phase in the magnet – typically measured by the density of the magnet. • We are investigating increasing the pressing pressure which requires special press construction, lubricants and tooling materials – current production pressing pressures are 7tonnes/cm2 for 5.9 g/cm3 and 10MGOe; estimated that > 20 tonnes/cm2 required for 6.3 g/cm3 and > 11 MGOe. • Optimize the particle encapsulation chemistry and process. • Tailored multimodal PSD’s for maximum packing density. • Particle shape control. 2. Magnetic powder Br/BHmax • Increase isotropic Br of powders while maintaining sufficient Hci to have “linear” B‐H demagnetization characteristic at the application temperature. Arc Permanent Magnet Neodymium Nickel N35UH Neodymium Generator Arc Magnet Nickel N33H Arc Neodymium Magnet Nickel N30H Segment Neodymium Magnet Nickel N52
40 Years Later No Fe16N2 Magnet – Why? • Difficult to synthesize pure Fe16N2 by conventional methods e.g. solubility of N in liquid Fe very low (0.045 versus 5.5 wt % for C). • Alloy cannot be formed by conventional processing methods e.g. melting and casting. • Contradictory results over the years probably due to inconsistent sample preparation and measurement techniques. • Fe16N2 decomposes above 300 C. Fe16N2 Magnet • Cannot be formed by powder metallurgical processing. • Lots of magnetization available but need coercivity for a useful PM compound; theoretical magnetocrystalline anisotropy H is 16 kOe but will need help from other mechanisms e.g. shape, strain. Bulk Fe16N2 Magnet Reported by UMN Team and Niron Magnetics Formed • Strained wire method used to enhance magnetic property; strain‐assisted annealing. Niron Magnetics – Good News • The company is producing bulk iron nitride magnets today for further research and development. • First principles calculations demonstrate a theoretical BHmax of 135 MGOe and Hc of 16 KOe. • Raw materials are cheap and abundant. • Isotropic bonded magnet BHmax > 30 MGOe feasible. Niron Magnetics – Bad News • Iron nitride by itself is inherently heat sensitive. • It decomposes before it sinters – iron nitride magnets will all be bonded in some fashion. • Coercivity needs to be improved. • They will need the same corrosion protection as raw iron. • Niron hasn’t announced a commercial product yet NdFeB Segment Magnets [...]
TESTING MAGNET Because magnetic fields are transparent to the human eye, measuring their strength requires specialized tools that measure the working air gap of the magnetic circuit. Currently there are two accepted ways of testing your magnetic separation equipment and this subject itself is not without controversy. The first is with the use of an [...]
MAGNETIC APPLICATIONS Magnets magnetically capture and control ferrous contaminants in material process systems. Primary Magnets Primary magnets are designed to be used in high volume process flows placed inline so as not to introduce any foreign contaminants from external sources into your production facility. They will remove large amounts of ferrous tramp between cleaning cycles [...]
Your permanent magnet should lose no more than 1% of its magnetic strength over a period of 100 years provided it is specified and cared for properly. There are a few things that may cause your magnet to lose its strength: HEAT Heat above the maximum level rated for the magnet material in your separator [...]