Neodymium Magnet Manufacturer | Tengye Magnetic

Hangzhou Tengye Magnetic Materials Co., Ltd. is a neodymium magnet supplier in China. We are both manufacturer and exporter. Tengye Magnetic manufactures a variety of sintered neodymium magnets according to different shapes.

Sintered neodymium magnets are manufactured by powder metallurgy. They are manufactured by the raw materials such as iron, rare earth alloy, etc. being melted in a strip casting furnace, cast by a roller and rapidly cooled to form NdFeB ingots. These NdFeB ingots are pulverized by hydrogen and jet milled under the protection of nitrogen; the NdFeB powder is then sintered into dense blocks. The blocks are then heat-treated, ,machined to shape, surface coated and magnetized.

Different shapes | Neodymium Magnet Manufacturer

After heat treatment, neodymium magnets are ready for machining. The machining process includes cutting, slicing, grinding, chamfering, etc. Depending on customer requirements, NdFeB blocks are machined into different sizes and shapes.

Different coatings | Neodymium Magnet Manufacturer

The material composition of neodymium magnets is iron (Fe), which oxidizes easily in the air. Therefore, it is necessary to apply a coating on neodymium magnets because they are prone to corrosion. Two main coating types are metallic coating and organic coating.

Coating type	Description	Characteristic	Color	Thickness
NiCuNi	Nickel-Copper-Nickel	great corrosion resistance	Silver	10-20 µm
Zn	Zinc	Good corrosion resistance	White-blue	8-10 µm
Epoxy	NiCu-Epoxy	Great corrosion resistance; Organic/plastic coating	black	15-25 µm
Epoxy	Epoxy	Great corrosion resistance; Organic/plastic coating	black	10-20 µm
Passivation	Also phosphate	Temporary protection	dark	1-2 µm
Gold	NiCuNi-Au	Great corrosion resistance; Skin Friendly	Gold	10-20 µm
Silver	NiCuNi-Ag	Great corrosion resistance; Skin Friendly	Gold	10-20 µm
Tin	Ni+Sn	Good corrosion resistance; Good for welding	Silver	10-20 µm
PTFE	Teflon® coating	Great corrosion resistance	Black	250-500 µm