Product Details

SmCo magnet is composed of Samarium, Cobalt, and a few transition metals. SmCo magnet is high performance, low temperature coefficient rare earth permanent magnets, and could keep their performance under the maximum working temperature up to 350 degree centigrade.

Manufacturing Process

Samarium, Cobalt, and a few transition metals will be made into the SmCo powder, then fine SmCo powder will be compacted in a die and sintered, fusing the powder into a solid material. There are 2 forms of pressing: die pressing and isostatic pressing. Sintered parts normally need some finish machining in order to meet final tolerances.

Machining & Tolerance

Generally, SmCo magnet must be machined using diamond-grinding techniques. Sometimes, machining operations may be performed on SmCo magnet using carbide tools, but surface finishes thus obtained may be less than optimal.

The Standard tolerances for SmCo magnet are +/- 0.1mm for ground dimensions, but sticter tolerances are possible if specially required.

Surface treatments

The corrosion resistance of SmCo magnet is considered good. Although Surface coating or plating is not generally required for SmCo magnet, all kinds of surface coating are also available, like Nickel, Zn, Ni-Cu-Ni, Gold, Silver, Sn,Chrome, ABS coating, Rubber coating, PTFE(Telfon) coating, stainless steel case and Epoxy coating etc.

Magnetizing & Packing

SmCo magnet require extremely high magnetizing fields, and can be magnetized in any direction as long as it is aligned properly. In some instances multiple pole magnetization is possible with special fixtures. All SmCo magnet is anisotropic, and can only be magnetized in the orientation direction, so particular consideration must be given to this when designing complex assemblies, if it is intended to magnetize after installation.

SmCo magnet is mechanically weak, but magnetically very strong. They should be packed properly in order to help user to handle them safely.

Magnetic properties of SmCo magnet

Grade		Residual Induction	Coercive Force	Intrinsic Coercive Force	Maximum Energy Product	Maximum Working Temperature
		Br	Hcb	Hcj	(BH)max	Tw
		mT	kA/m	kA/m	kJ/m3
		[kGs]	[kOe]	[kOe]	[MGOe]
SmCo5	YX18	820-920	639-756	1194-1751	127-159	250°
	YX18	[8.2-9.2]	[8-9.5]	[15-22]	[16-20]
	YX20	870-950	639-756	1194-1751	143-175
	YX20	[8.7-9.5]	[8-9.5]	[15-22]	[18-22]
	YX22	930-1000	660-772	1194-1751	159-191
	YX22	[9.3-1.0]	[8.3-9.7]	[15-22]	[20-24]
	YX24	960-1040	660-780	1194-1751	175-207
	YX24	[9.6-10.4]	[8.3-9.8]	[15-22]	[22-26]
Sm2Co17	YXS24M	960-1040	318-772	398-955	175-207	350°
	YXS24M	[9.6-10.4]	[4-9.7]	[5-12]	[22-26]
	YXS24	960-1040	660-780	≥1194	175-207
	YXS24	[9.6-10.4]	[8.3-9.8]	[≥15]	[22-26]
	YXS24H	960-1040	660-780	≥1592	175-207
	YXS24H	[9.6-10.4]	[8.3-9.8]	[≥20]	[22-26]
	YXS26M	1170-1220	318-796	398-955	191-223
	YXS26M	[10-10.7]	[4-10]	[5-12]	[25-28]
	YXS26	1170-1220	677-820	≥1194	191-223
	YXS26	[10-10.7]	[8.5-10.3]	[≥15]	[25-28]
	YXS26H	1170-1220	677-820	≥1592	191-223
	YXS26H	[10-10.7]	[8.5-10.3]	[≥20]	[25-28]
	YXS28M	1040-1110	318-796	398-955	207-239
	YXS28M	[10.4-11]	[4-10]	[5-12]	[26-30]
	YXS28	1040-1110	677-820	≥1194	207-239
	YXS28	[10.4-11]	[8.5-10.3]	[≥15]	[26-30]
	YXS28H	1040-1110	677-820	≥1592	207-239
	YXS28H	[10.4-11]	[8.5-10.3]	[≥20]	[26-30]
	YXS30M	1070-1120	318-796	398-955	223-247
	YXS30M	[10.7-11.2]	[4-10]	[5-12]	[28-31]
	YXS30	1070-1120	677-820	≥1194	223-247
	YXS30	[10.7-11.2]	[8.5-10.3]	[≥15]	[28-31]
	YXS32M	1090-1150	318-796	398-955	238-262
	YXS32M	[10.9-11.5]	[4-10]	[5-12]	[29-32]
	YXS32	1090-1150	677-820	≥1353	238-262
	YXS32	[10.9-11.5]	[8.5-10.3]	[≥12]	[29-32]
Low Temp Coeff Sm2Co17	YXL22LT	930-1000	677-756	≥1194	159-191	350°
	YXL22LT	[9.3-10]	[8.5-9.5]	[≥15]	[20-24]
	YXL24LT	960-1040	677-756	≥1194	175-207
	YXL24LT	[9.6-10.4]	[8.5-9.5]	[≥15]	[22-26]
	YXL26LT	1000-1070	677-812	≥1433	191-223
	YXL26LT	[10-10.7]	[8.5-10.2]	[≥18]	[25-28]

Physical properties of SmCo magnet

Grade	Modulus of elasticy	Ultimate tensile strength	Density	Electrical Resistivity	Curie temperature	Recoil permeability	Temp.Coeff.of Br
SmCo5	23 x 106 psi	6 x 103 psi	8.2 g/cm3	5 µ-ohm-cm/cm2	750-770℃	1.05	From -0.043 to -0.045% / ℃
Sm2Co17	17 x 106 psi	5 x 103 psi	8.4 g/cm3	86 µ-ohm-cm/cm2	825-850℃	1.05	From -0.03 to -0.032% / ℃