SmCo Rare Earth Magnets Overview

Two common compositions of SmCo magnets are Sm1Co5 and Sm2Co17. Generally, the cost of SmCo magnets is higher than NdFeB magnets. As a big advantage, SmCo magnets can operate at higher temperatures up to 300 degrees Centigrade. SmCo magnets are widely used in applications in which higher operating temperature and higher corrosion and oxidation resistance are crucial. The main ingredient of SmCo permanent magnet is metal cobalt(CoY99.95%). So its price is high!


SmCo Rare Earth Magnets Properties

Materials	Grade	Br (Residual induction)	Hcb (Coercive Force)	Hcj (Intrinsic coercive Force)	(BH)max. Max. Energy Product	Max. Operating Temp.	TC Curie Temp.
		(KGs)	(KOe)	(KOe)	(MGOe)	(°c)	(°c)
Sm1Co5	YX-16	8.1-8.5	7.8-8.3	15-23	14-16	250	750
Sm1Co5	YX-18	8.5-9.0	8.3-8.8	15-23	16-18	250	750
Sm1Co5	YX-20	9.0-9.4	8.5-9.1	15-23	19-21	250	750
Sm1Co5	YX-22	9.2-9.6	8.9-9.4	15-23	20-22	250	750
Sm1Co5	YX-24	9.6-10	9.2-9.7	15-23	22-24	250	750
Sm1Co5	YX-18s	8.5-9	8.3-8.8	18-25	17-19	250	750
Sm1Co5	YX-20s	9.0-9.4	8.5-9.1	18-25	18-20	250	750
Sm1Co5	YX-22s	9.2-9.6	8.9-9.4	18-25	20-22	250	750
Sm1Co5	LTc(YX-10)	5.9-6.3	5.8-6.2	18-23	8.5-10	250	700
Sm2Co17	YXG-24H	9.5-10.2	8.7-9.4	≥25	22-24	350	800
Sm2Co17	YXG-26H	10.2-10.5	9.4-9.8	≥25	24-26	350	800
Sm2Co17	YXG-28H	10.3-10.8	9.5-10	≥25	26-28	350	800
Sm2Co17	YXG-30H	10.8-11.0	9.9-10.5	≥25	28-30	350	800
Sm2Co17	YXG-22	9.3-9.7	8.5-9.3	≥18	20-23	300	800
Sm2Co17	YXG-24	9.5-10.2	8.7-9.4	≥18	22-24	300	800
Sm2Co17	YXG-26	10.2-10.5	9.4-9.8	≥18	24-26	300	800
Sm2Co17	YXG-28	10.3--10.8	9.5-10	≥18	26-28	300	800
Sm2Co17	YXG-30	10.8-11.0	9.9-10.5	≥25	28-30	300	800
Sm2Co17	YXG-32	11-11.3	10.2-10.6	≥15	29-32	300	800
Sm2Co17	YXG-26M	10.2-10.5	9.4-9.8	12-16	24-26	300	800
Sm2Co17	YXG-28M	10.3-10.8	9.5-10	12-16	26-28	300	800
Sm2Co17	YXG-30M	10.8-11.0	9.9-10.5	12-16	28-30	300	800
Sm2Co17	YXG-32M	10.8-11.0	9.9-10.5	12-16	29-32	300	800
Sm2Co17	YXG-28L	10.2-10.8	5.2-9.0	5.5-10	26-28	250	800
Sm2Co17	YXG-30L	10.8-11.5	5.2-9.0	5.5-10.0	28-30	250	800
Sm2Co17	YXG-32L	11-11.3	5.2-9.0	5.5-10.0	29-32	250	800
Sm2Co17	LTC(YXG-22)	9.4-9.8	8.4-9.0	15-20	21-23	300	840

Physical Characteristics

	Sm1Co5	Sm2Co17
Temperature Coefficient of Br (%/°C)	-0.05	-0.03
Temperature Coefficient of iHc (%/°C)	-0.3	-0.2
Curie Temperature (°C)	700-750	800-850
Density (g/cm3)	8.2-8.4	8.3-8.5
Vickers Hardness (HV)	450-500	500-600
Working Temperature (°CC)	250	350

Key Advantages

SmCo magnets can operate at higher temperatures up to 300 degrees Centigrade.
High magnetic performance - up to about 32MGOe.
No need to be protected against oxidation.
Quick Leads

Density - 8.3 g/ cm3 (Sm1Co5), 8.4 g/ cm3 (Sm2Co17)
Manufacturing process - sintering (most common), with some injection molding and compression bonding.
Various shapes-- blocks, bars, discs, rings, arc segments, cylinders, etc.
Wide range of Grades - from about 1410 to 3214. (First 2 digits represent BH.max, and second two digits represent Intrinsic Coercivity, Hci.)
High magnetic performance - up to about 32MGOe.
Saturation magnetizing field required - about 50kOe
Operate at higher temperatures up to 300°c.

Common Applications

High performance motors   Magnetic couplings    Magnetic separators    watches   Transducers   Speakers   Instruments   Medical equipments   Positional detectors   Various magnetism spreading devices   Generators  Magnetic processors   magnetic derrick    electrical engineering.