Compression Bonded SmCo Magnets

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Samarium Cobalt Compression Bonded Magnets are one of the newest types of magnetic materials and are made by compressing an epoxy coated SmCo magnet powder into a final shape and then heat treating it. The result is a high density material which produces a higher magnetic output than by injection molding. Although compression molding provides greater flexibility in geometry shape and size, they do not provide the range of complex geometries which can be achieved by injection molding. The following tables list common grades, however custom grades can be made depending on customers’ requirements.

Compression Bonded SmCo

Magnetic Properties	Remanence		Coercive Force		Intrinsic Coercivity		Energy Product
	Br		Hc		Hci		(BH)max
	kGs	mT	kOe	kA/m	kOe	kA/m	MGOe	kJ/m
BCS-4	3.8-4.2	380-420	2.5-3.5	200-280	8.0-13.0	640-1030	3.5-4.5	28-36
BCS-5	4.1-5.4	410-540	3.3-4.5	265-360	8.0-15.0	640-1200	4.5-5.5	36-44
BCS-9	6.1-6.6	610-660	5.2-6.0	415-480	8.0-15.0	640-1200	8.5-9.5	68-76
BCS-11	6.4-7.2	640-720	5.4-6.4	430-510	8.0-15.0	640-1200	9.5-11.0	76-88

Temperature Properties	Reversible Temperature Coefficient				Max Working Temp.		Curie Temperature
	%/°C				Tmax		Tc
	Bd		Hd		°C		°C
BCS-4	-0.035		-0.29		150		700
BCS-5	-0.035		-0.29		150		700
BCS-9	-0.035		-0.29		150		700
BCS-11	-0.035		-0.29		150		700

Physical Properties	Density	Hardness	Compressive Strength		Young’s Modulus		Electrical Resistivity
	g/cm³	R	Mpa		Mpa		Ohm-cm
BCS-4	6.4-7.0	80-125	30-32		29000		0.04
BCS-5	6.5-7.0	80-125	30-32		29000		0.04
BCS-9	6.6-7.1	80-125	30-32		29000		0.04
BCS-11	6.7-7.2	80-125	30-32		29000		0.04