Gallery View: NdFeB magnets

China companies offer sintered and bonded NdFeB magnets in various configurations.

China makers' typical range of sintered NdFeB magnets is categorized by grade, shape and surface treatment. The options in the first include N35 to N52, N35M to N50M, N30H to N48H, N30SH to N45SH, 30UH to 40UH, N28UH to N35UH, N28EH to N35EH and 30AH to 33AH.

Products usually come in ring, curved, block, cylindrical and trapezoidal variants with zinc, nickel or epoxy coating for rust resistance. Companies such as Neopro also offer disc and segmented models and additional choices of protective surface finishes such as gold, copper and parylene.

The main applications are motors, speakers, disks and magnetic resonance imaging equipment for the electronics, automotive, wind turbine, mechanical systems and medical fields.

In bonded NdFeB magnets, the selection is divided into compression-bonded and injection-molded kinds. The former includes mainly BNP-6, BNP-8L, BNP-8, BNP-8SR, BNP-8H, BNP-9, BNP-11, NBP-11L and BNP-12L units, while common injection-molded releases come in BNI-3, BNI-4, BNI-5, BNI-6, BNI-6H, BNI-7 and BNI-5SR (PPS).

Typical bonded magnets are in square, cylindrical and round versions, and coated with zinc, nickel, gold, NiCuNi or epoxy resin. Boasting enhanced remanence, coercivity and energy product, these are broadly adopted in office automation, A/V devices, motors and vehicles.

The majority of companies source materials locally. They expect prices to continue fluctuating with manufacturing input costs until end-2016.

Here is a selection of NdFeB magnets from China.

Bonded NdFeB magnet

Magsuper (Dongguan) Corp.'s model Magnetring#001-42 bonded NdFeB magnet comes in MSM-2, MSM-8, MSM-10, MSM-12 and MSM-13L grades, and radial, multipolar and angled magnetization types. The unit has an epoxy or parylene surface treatment. It supports 160 C maximum operating temperature.

The minimum order is 2,000 units. Delivery lead time is 3 days.

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Sintered NdFeB magnet

Model GL-B2_#2849 sintered NdFeB magnet from Ningbo Keke Magnet Co. Ltd has versions in N35 to N54, 35M to 52M, 33H to 50H, 33SH to 45SH, 30UH to 42UH, 30EH to 38EH and 28AH to 33AH grades. The protective coating options include NiCuNi, nickel, zinc, gold, silver, copper and epoxy.

The unit is available in disc, cylindrical, block, ring, countersunk, segment, trapezoidal and irregular shapes.

The minimum order of 50 units is delivered within 10 days.

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Sintered NdFeB magnet

This sintered NdFeB magnet from Ningbo Lihe Magnetic Industry Co. Ltd, model NDS-#4760, has zinc, nickel, NiCuNi, gold, silver, epoxy or phosphate coating. In terms of grades, the choices are N35 to N52, N35M to N50M, N35H to N48H, N30SH to N45SH, N30UH to N42UH, N30EH to N40EH and N30AH to N33AH.

The minimum order is 100 units, and delivery lead time is 15 days.

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Sintered NdFeB magnet

Pan'an Town Henggu Magnetic Co. Ltd's N33~N52 model is a sintered NdFeB magnet with 1.21T remanence, 915kA/m and 965kA/m coercivity and intrinsic coercivity, and 33.9 to 47.8MgOe maximum energy product. Density is 7.5g/cm³.

The unit in N33 to N52 grades operates in 80 to 200 C.

The negotiable minimum order has a delivery lead time of 5 days.