Alliance N-28UH Neodymium Iron Boron Magnetic Material

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Alliance N-28UH Neodymium Iron Boron Magnetic Material (discontinued **)
Categories:	Metal; Electronic/Magnetic Alloy; Ferrous Metal; Ferritic
Material Notes:	Neodymium magnets (NdFeB or Neo), are the most commonly used magnet materials for high tech motors and sensors. They are popular due to their high magnetic strength and resistance to demagnetization. They do not have the high temperature resistance of other magnet materials, however they can be used in applications with maximum operating temperatures of 220°C. Because of a high iron content, they will corrode over time if not plated or coated. As with all magnet materials, NdFeB should never be used as a structural element in an application.
Key Words:	NdFeB; Neo, Magnet, Magnets
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Physical Properties	Metric	English	Comments

Density	7.50 - 7.80 g/cc	0.271 - 0.282 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Vickers	570 - 580	570 - 580
Tensile Strength, Ultimate	80.0 MPa	11600 psi
Modulus of Elasticity	150 - 160 GPa	21800 - 23200 ksi
Flexural Strength	180 - 270 MPa	26100 - 39200 psi
Compressive Strength	850 - 1050 MPa	123000 - 152000 psi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.000120 - 0.000160 ohm-cm	0.000120 - 0.000160 ohm-cm
Magnetic Coercive Force, H_c	9600 Oe	9600 Oe
	25000 Oe	25000 Oe	Intrinsic
Magnetic Remanence, B_r	10600 Gauss	10600 Gauss
Magnetic Maximum Energy Product, BH	26 - 29 MGOe	26 - 29 MGOe
Curie Temperature	350 °C	662 °F

Thermal Properties	Metric	English	Comments
CTE, linear	5.00 µm/m-°C @Temperature 20.0 °C	2.78 µin/in-°F @Temperature 68.0 °F	Parallel DOM
CTE, linear, Transverse to Flow	-1.00 µm/m-°C @Temperature 23.0 °C	-0.556 µin/in-°F @Temperature 73.4 °F	Perpendicular to M
Specific Heat Capacity	0.440 J/g-°C	0.105 BTU/lb-°F
Thermal Conductivity	9.00 W/m-K	62.5 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	180 °C	356 °F

Descriptive Properties
Reversible Temp Coef., B_d	-0.11 %/°C
Reversible Temp Coef., H_d	-0.51 %/°C
Temperature Coefficient, B_r	-0.11 %/°C		(20-100°C)
Temperature Coefficient, H_ci	-0.72 %/°C		(20-100°C)

**
Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

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