Gesinterte Neodym-Magnete

sagawa, Hadjipanayis, and Croat independently discovered Nd-Fe-B based Seltenerd-Permanentmagnete almost simultaneously in 1984. The main phase of this material is Nd2Fe14B and its maximum energy products achieved 280kJ/m3 at that time. Besides the relatively lower Curie temperature, Nd2Fe14B is an ideal and promising permanent magnet material. The successful development of Neodym-Magneten announced the birth of the third-generation rare earth permanent magnets. Sintered Neodymium magnets, also known as Neo magnets, offer the strongest magnetic power today. They are particularly suitable for high volume production in the variety of Formen und Größen. Precise dimensional control can be obtained in the machining processes. With these advantages, sintered Neodymium magnets have been widely applied in lots of commercial fields, such as high-performance motors, brushless DC motors, magnetic separators, magnetic resonance imaging (MRI), sensors, loudspeakers, consumer electronics and green energy.

Sintered-Neodymium-Magnets-updated

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Shape Categories of Sintered Neodymium Magnets

Magnetic Properties of Sintered Neodymium Magnets

The grades of sintered Neodymium magnets are commonly defined via letter N + number + letter. The letter N is the abbreviation and stand for the rare earth element Neodymium. The number represents the (BH)max of the magnet in CGS unit “Mega-Gauss Oersted” (MOGe). There are perhaps one or two letters tagged on the end determine the Hcj and maximum operating temperature of the sintered Neodymium magnets. M (middle), H (high), H (high), SH (super high), UH (ultra high), EH (extreme high), and AH (abnormal high) grade should be greater than 14, 17, 20, 25, 30, 35kOe, respectively. Then their maximale Betriebstemperatur can reach 100, 120, 150, 180, 200, and 230 degrees Celsius separately.

Klasse

Remanence

Br

Coercivity

Hcb

Koerzivität

Hcj

Max. Energie Artikel

(BH) max

Max. Arbeitstemperatur
T kGs kA / m kOe kA / m kOe kJ / m3 MGOe
N30 1.08-1.13 10.8-11.3 ≥798 ≥10.0 ≥955 ≥12 223-247 28-31 80
N33 1.13-1.17 11.3-11.7 ≥836 ≥10.5 ≥955 ≥12 247-271 31-34 80
N35 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥955 ≥12 263-287 33-36 80
N38 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥955 ≥12 287-310 36-39 80
N40 1.25-1.28 12.5-12.8 ≥907 ≥11.4 ≥955 ≥12 302-326 38-41 80
N42 1.28-1.32 12.8-13.2 ≥915 ≥11.5 ≥955 ≥12 318-342 40-43 80
N45 1.32-1.38 13.2-13.8 ≥923 ≥11.6 ≥955 ≥12 342-366 43-46 80
N48 1.38-1.42 13.8-14.2 ≥923 ≥11.6 ≥955 ≥12 366-390 46-49 80
N50 1.40-1.45 14.0-14.5 ≥796 ≥10.0 ≥876 ≥11 382-406 48-51 80
N52 1.43-1.48 14.3-14.8 ≥796 ≥10.0 ≥876 ≥11 398-422 50-53 80
N55 1.46-1.52 14.6-15.2 ≥796 ≥10.0 ≥876 ≥11 414-430 52-54 80
N35M 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥1114 ≥14 263-287 33-36 100
N38M 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥1114 ≥14 287-310 36-39 100
N40M 1.25-1.28 12.5-12.8 ≥923 ≥11.6 ≥1114 ≥14 302-326 38-41 100
N42M 1.28-1.32 12.8-13.2 ≥955 ≥12.0 ≥1114 ≥14 318-342 40-43 100
N45M 1.32-1.38 13.2-13.8 ≥995 ≥12.5 ≥1114 ≥14 342-366 43-46 100
N48M 1.37-1.43 13.7-14.3 ≥1027 ≥12.9 ≥1114 ≥14 366-390 46-49 100
N50M 1.40-1.45 14.0-14.5 ≥1033 ≥13.0 ≥1114 ≥14 382-406 48-51 100
N52M 1.43-1.48 14.3-14.8 ≥1050 ≥13.2 ≥1114 ≥14 398-422 50-53 100
N54M 1.45-1.50 14.5-15.0 ≥1051 ≥13.2 ≥1114 ≥14 414-438 52-55 100
N35H 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥1353 ≥17 263-287 33-36 120
N38H 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥1353 ≥17 287-310 36-39 120
N40H 1.25-1.28 12.5-12.8 ≥923 ≥11.6 ≥1353 ≥17 302-326 38-41 120
N42H 1.28-1.32 12.8-13.2 ≥955 ≥12.0 ≥1353 ≥17 318-342 40-43 120
N45H 1.32-1.36 13.2-13.6 ≥963 ≥12.1 ≥1353 ≥17 342-366 43-46 120
N48H 1.37-1.43 13.7-14.3 ≥995 ≥12.5 ≥1353 ≥17 366-390 46-49 120
N50H 1.40-1.45 14.0-14.5 ≥1011 ≥12.7 ≥1353 ≥17 382-406 48-51 120
N52H 1.43-1.48 14.3-14.8 ≥1027 ≥12.9 ≥1353 ≥17 398-422 50-53 120
N35SH 1.17-1.22 11.7-12.2 ≥876 ≥11.0 ≥1592 ≥20 263-287 33-36 150
N38SH 1.22-1.25 12.2-12.5 ≥907 ≥11.4 ≥1592 ≥20 287-310 36-39 150
N40SH 1.25-1.28 12.5-12.8 ≥939 ≥11.8 ≥1592 ≥20 302-326 38-41 150
N42SH 1.28-1.32 12.8-13.2 ≥987 ≥12.4 ≥1592 ≥20 318-342 40-43 150
N45SH 1.32-1.38 13.2-13.8 ≥1003 ≥12.6 ≥1592 ≥20 342-366 43-46 150
N48SH 1.37-1.43 13.7-14.3 ≥1027 ≥12.9 ≥1592 ≥20 366-390 46-49 150
N50SH 1.40-1.45 14.0-14.5 ≥1003 ≥12.6 ≥1592 ≥20 382-406 48-51 150
N28UH 1.04-1.08 10.4-10.8 ≥764 ≥9.6 ≥1990 ≥25 207-231 26-29 180
N30UH 1.08-1.13 10.8-11.3 ≥812 ≥10.2 ≥1990 ≥25 223-247 28-31 180
N33UH 1.13-1.17 11.3-11.7 ≥852 ≥10.7 ≥1990 ≥25 247-271 31-34 180
N35UH 1.17-1.22 11.7-12.2 ≥860 ≥10.8 ≥1990 ≥25 263-287 33-36 180
N38UH 1.22-1.25 12.2-12.5 ≥876 ≥11.0 ≥1990 ≥25 287-310 36-39 180
N40UH 1.25-1.28 12.5-12.8 ≥899 ≥11.3 ≥1990 ≥25 302-326 38-41 180
N42UH 1.28-1.32 12.8-13.2 ≥899 ≥11.3 ≥1990 ≥25 318-342 40-43 180
N45UH 1.32-1.36 13.2-13.6 ≥908 ≥11.4 ≥1990 ≥25 342-366 43-46 180
N48UH 1.37-1.43 13.7-14.3 ≥908 ≥11.4 ≥1990 ≥25 366-390 46-49 180
N28EH 1.04-1.08 10.4-10.8 ≥780 ≥9.8 ≥2388 ≥30 207-231 26-29 200
N30EH 1.08-1.13 10.8-11.3 ≥812 ≥10.2 ≥2388 ≥30 223-247 28-31 200
N33EH 1.13-1.17 11.3-11.7 ≥836 ≥10.5 ≥2388 ≥30 247-271 31-34 200
N35EH 1.17-1.22 11.7-12.2 ≥876 ≥11.0 ≥2388 ≥30 263-287 33-36 200
N38EH 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥2388 ≥30 287-310 36-39 200
N40EH 1.25-1.28 12.5-12.8 ≥899 ≥11.3 ≥2388 ≥30 302-326 38-41 200
N42EH 1.28-1.32 12.8-13.2 ≥899 ≥11.3 ≥2388 ≥30 318-342 40-43 200
N45EH 1.32-1.36 13.2-13.6 ≥899 ≥11.3 ≥2388 ≥30 342-366 43-46 200
N28AH 1.04-1.08 10.4-10.8 ≥787 ≥9.9 ≥2786 ≥35 207-231 26-29 230
N30AH 1.08-1.13 10.8-11.3 ≥819 ≥10.3 ≥2786 ≥35 223-247 28-31 230
N33AH 1.13-1.17 11.3-11.7 ≥843 ≥10.6 ≥2786 ≥35 247-271 31-34 230
N35AH 1.17-1.22 11.7-12.2 ≥876 ≥11.0 ≥2786 ≥35 263-287 33-36 230
N38AH 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥2786 ≥35 287-310 36-39 230
  • Die oben genannten Daten der magnetischen Eigenschaften und physikalischen Eigenschaften bei Raumtemperatur gegeben.
  • Die maximale Arbeitstemperatur des Magneten ist aufgrund des Längen-Durchmesser-Verhältnisses, der Beschichtungsdicke und anderer Umgebungsfaktoren veränderbar.
Parameter Einheit Referenzbereich
Temperature Coefficient of Br / α(Br) % / ℃ -0.08 ~ -0.13
Temperature Coefficient of Hcj/ β(Hcj) % / ℃ -0.35 ~ -0.80
Curie Temperature / Tc 310-380
Recoil Permeability / μrec - 1.05

Physical Properties of Sintered Neodymium Magnets

Besides permanent magnetic performance and corrosion resistance, working stability of sintered Neodymium magnets is strongly related to its unique physical properties. In addition to routine density or hardness, physical properties of sintered Neodymium magnet also included mechanical properties, electrical properties, even thermal properties. Mechanical properties are mainly covered DruckfestigkeitZerreißfestigkeit und Biegefestigkeit. These three metrics possess significantly impact on the machinability and long-term performance of sintered Neodymium magnets. Electrical properties of alloy material are generally characterized by electrical resistivity. Sintered Neodymium magnets have relatively lower electrical resistivity and vulnerable to eddy current loss when applied to high-speed rotary machinery. Thermal properties of sintered Neodymium magnets are usually measured by coefficient of thermal expansion. Thermal expansion of sintered Neodymium magnets will positively cause dimension change, then magnets in the magnetic device will generate a certain of stress due to such dimension change if the expansion difference between magnets and assembly material relatively large, hence lead to mechanical damages and magnetic performance deteriorations.

Artikel Parameter Einheit Referenzbereich
Regular Physical Properties Dichte / ρ g / cm3 7.40-7.80
Vickness Hardness / HV - 550-650
Elektrische Eigenschaften Elektrischer widerstand μΩ · m 1.4
Mechanische Eigenschaften Druckfestigkeit MPa 1050
Zugfestigkeit MPa 80
Biegefestigkeit MPa 290
Thermische Eigenschaften Wärmeleitfähigkeit W / (m · K) 6-8
Wärmeausdehnungskoeffizient 10-6/K C⊥: -1.5, C∥6.5.

 

Surface Treatments of Sintered Neodymium Magnets

Surface protective treatment is the ineluctable procedure for the sintered Neodymium magnets. Nd-rich phase exhibit quite strong oxidation tendency and will form a primary battery system with main phase under humid condition. Finally, Nd-rich phase is corroded and main phase particle peeled from the body gradually. Surface protective treatment of sintered Neodymium magnets is can be divided into wet and dry process. The commonly-used wet process includes electroplating, electrolessplating, electrophoresis, spray coating, and dip coating. Dry process includes physical vapor deposition (PVD) process and chemical vapor deposition (CVD) process.

Beschichtung

Dicke

(μm)

Farbe

SST

(Stunden)

PCT

(Stunden)

Eigenschaften
BW-Zn 4-15 Leuchtendes Blau ≥24 - Secondly commonly used single layer coating. Poor anti-corrosion ability.
Color-Zn 4-15 Shining color ≥48 - Anti-corrosion ability is better than BW-Zn.
Ni-Cu-Ni 5-20 Helles Silber ≥48 ≥48 Most regular used multi-layer coating. Excellent humidity and salt spray resistance.
Chemical-Ni 5-20 Dunkelsilber ≥72 ≥48 Excellent humidity and salt spray resistance with uniform appearance.
Ni-Cu-Ni-Au 5-20 Golden ≥72 ≥96 Excellent electrical conductivity and decorative.
Ni-Cu-Ni-Ag 5-20 Silbermedaille ≥72 ≥96 Excellent electrical conductivity and decorative.
Ni-Cu-Ni-Sn 5-20 Silbermedaille ≥72 ≥96 Excellent humidity resistance.
Phosphate 1-3 Dunkelgrau - - Temporary protection.
Aluminium 2-15 Helles Silber ≥24 ≥24 Noticeable coating.
Epoxidharz 10-30 Schwarz / Grau ≥72 ≥72 Excellent humidity and salt spray resistance. Superir binding force.
Parylene 5-20 Farblos ≥96 - Excellent humidity, salt spray, corrosive vapors, and solvents resistance. Free of pore.
Everlube 10-15 Gold-gelb ≥120 ≥72 Excellent humidity resistance.
Teflon 8-15 Schwarz ≥24 ≥24 High temperature and rub resistance. Self-lubricant and 100% water-proof.
Note: anti-corrosion capability of coating is also influenced by the shape and size of magnet.

Magnetization Directions of Sintered Neodymium Magnets

Magnetization process refers to apply magnetic field along the definite direction of the permanent magnet to saturate the magnet. Different permanent magnet requires unlike magnetic field strength to achieve saturation. As a type of anisotropic magnet, sintered Neodymium magnets have a preferred direction of magnetization and various pole configurations can be realized as long as not conflicting with its own orientation.

Axially Magnetized Magnet featured

Axially Magnetization

Axially Multipole Magnetized Magnet featured

Axially Multipole Magnetization

Diametrically Magnetized Magnet featured

Diametrically Magnetization

Diametrically Multipole Magnetized Magnet featured

Radial Multipole Magnetization

Skewed Magnetized Magnet featured

Skewed Magnetization

Radially Magnetized Magnet featured

Radially Magnetization

Manufacturing Process of Sintered Neodymium Magnets

Magnetization process refers to apply magnetic field along the definite direction of the permanent magnet to saturate the magnet. Different permanent magnet requires unlike magnetic field strength to achieve saturation. As a type of anisotropic magnet, sintered Neodymium magnets have a preferred direction of magnetization and various pole configurations can be realized as long as not conflicting with its own orientation.

Wiegen

Wiegen

Melting and Strip Casting

Melting & Strip Casting

Hydrogen Decrepitation

Hydrogen Decrepitation

Strahlfräsen

Strahlfräsen

Verdichten

Verdichten

Sintern

Sintern

Maschinenbearbeitung

Maschinenbearbeitung

Oberflächenbearbeitung

Oberflächenbearbeitung

Magnetisierung

Magnetisierung

Verpackung und Versand

Verpackung und Versand

Influencing Factors of Sintered Neodymium Magnet Price

As a primary raw material, the content of PrNd mischmetal in sintered Neodymium magnets is around 30wt%, therefore, fluctuations of PrNd price trend have the most direct influence on the price of sintered Neodymium magnets. Either Dy or Tb can significantly enhance intrinsic coercivity Hcj of sintered Neodymium magnets, but the cost is sharply increasing at the same time.

PrNd Price Trend Since 2010

DyFe Price Trend Since 2010

DyFe Price Trend Since 2010