neodymium(NdFeB) magnets, samarium cobalt(SmCo5, Sm2Co17)magnets, Alnico magnets, permanent rare earth magnets.
NCMag™ supplier of SmCo(sintered, bonded) magnets; manufacturer of samarium cobalt (SmCo5, Sm2Co17) magnets in china.

what's samarium cobalt magnets? where's SmCo(SmCo5, Sm2Co17) manufacturer? how to buy sintered SmCo magnets or bonded samarium cobalt?

obalt (SmCo) magnet is manufactured by a process called sintering, and as with all sintered materials, inherent cracks are very possible. Design engineers must not expect the magnet to provide mechanical integrity; instead the magnet must be utilized for its magnetic functions and other mechanical systems must be designed to provide the mechanical reliability of the system.

Q:wht is SmCo magnets?

Samarium cobalt (SmCo) magnet is manufactured by a process called sintering, and as with all sintered materials, inherent cracks are very possible. Design engineers must not expect the magnet to provide mechanical integrity; instead the magnet must be utilized for its magnetic functions and other mechanical systems must be designed to provide the mechanical reliability of the system.

types of samarium cobalt magnets

two types of samarium-cobalt magnet: SmCo5 magnets and Sm2Co17 magnets,They are strong permanent magnet made of an alloy of samarium and cobalt, less strong than neodymium magnets, but have higher temperature ratings. They are expensive, brittle, and prone to cracking and chipping.

These samarium cobalt magnet alloys have one atom of rare earth Samarium and five atoms of Cobalt. By weight this samarium cobalt magnet alloy will typically contain 36% Samarium with the balance Cobalt. The energy products of these samarium cobalt alloys range from 16 MGOe to 25 MGOe. These Samarium Cobalt magnets generally have a reversible temperature coefficient of -0.05%/°C. Saturation magnetization can be achieved with a moderate magnetizing field. This series of Samarium Cobalt magnet is easier to calibrate to a specific magnetic field than the SmCo 2-17 series magnets.

grade of sintered samarium cobalt Sm2Co17magnets

sintered samarium cobalt magnets Sm2Co17magnets
grade Br HcB HcJ (BH)max
T KGs KA/m KOe KA/m KOe KJ/m 3 MGoe
SMCOYXG-24H 0.95-1.02 9.5-10.2 700-750 8.7-9.4 ≥1990 ≥25 175-191 22-24
SMCOYXG-26H 1.02-1.05 10.2-10.5 750-780 9.4-9.8 ≥1990 ≥25 191-207 24-26
SMCOYXG-28H 1.03-1.08 10.3-10.8 756-796 9.5-10.0 ≥1990 ≥25 207-220 26-28
SMCOYXG-30H 1.08-1.10 10.8-11.0 788-825 9.9-10.5 ≥1990 ≥25 220-240 28-30
SMCOYXG-24 0.95-1.02 9.5-10.2 700-750 8.7-9.4 ≥1433 ≥18 175-191 22-24
SMCOYXG-26 1.02-1.05 10.2-10.5 750-780 9.4-9.8 ≥1433 ≥18 191-207 24-26
SMCOYXG-28 1.03-1.08 10.3-10.8 759-796 9.5-10.0 ≥1433 ≥18 207-220 26-28
SMCOYXG-30 1.08-1.10 10.8-11.0 788-835 9.9-10.8 ≥1433 ≥18 220-240 28-31
SMCOYXG-26M 1.02-1.05 10.2-10.5 750-780 9.5-9.9 955-1273 12-16 191-207 24-26
SMCOYXG-28M 1.03-1.08 10.3-10.8 756-796 9.5-10.0 955-1273 12-16 207-220 26-28
SMCOYXG-30M 1.08-1.10 10.8-11.0 788-835 9.9-10.5 955-1273 12-16 220-240 28-30
SMCOYXG-28L 1.02-1.08 10.2-10.8 398-445 5.0-5.6 400-520 5.2-6.5 207-220 26-28
SMCOYXG-30L 1.08-1.15 10.8-11.5 398-445 5.0-5.6 400-520 5.2-6.5 220-240 28-30
total 13 sintered samarium cobalt magnets SM2CO17

grades of bonded samarium cobalt magnets

bonded samarium cobalt magnets SmCo magnets
parameter remanence Coercive force intrinsic coercivity maximum energy product density pressure ring strength
grade kGs KOe KOe MGOe g/cm3 N/cm2
SCI-3 3.0-4.0 2.5-3.5 9.0-15.0 2.5-3.5 3-4.5 >76
SCI-5 3.5-5.5 3.1-4.5 9.0-15.0 4.0-6.5 4-5.5 >76
SCI-8 5.5-6.8 4.2-5.8 9.0-15.0 6.0-8.0 4.5-6.0 >76
total 4 bonded samarium cobalt magnets SmCo magnets

Type 1:5 Samarium cobalt SmCo5 magnets

sintered samarium cobalt magnets Sm1Co5magnets
Typical Physical Properties - Type 1:5
Curie Temperature 720 - 750°C
Coefficient of Thermal Expansion - Perpendicular +12.0 - +13.0 x 10-6 °C-1
Coefficient of Thermal Expansion - Parallel +6.0 - +7.0 x 10-6 °C-1
Electrical Resistivity 50 - 60 µΩ·cm
Density 8.2 - 8.3 g·cm-3
Vicker's Hardness 550 - 650 HV
Young's Modulus 100 - 110 kN·mm-2
Bending Strength 0.12 - 0.18 kN·mm-2
Compressive Strength 0.9 - 1.0 kN·mm-2
total 9 samarium cobalt magnets SM1CO5
In the presence of a moderately strong magnetic field, unmagnetized magnets of this series will try to align its orietation axis to the magnetic field. Unmagnetized magnets of this series when exposed to moderately strong fields will get slightly magnetized. This can be an issue if post processing requires that the magnet be plated or coated. The slight field that the magnet picks up can attract debris during the plating or coating process causing for a potential plating or coating failure or a mechanically out of tolerance condition.

Machining or grinding this magnet by the user is discouraged. This material must be ground using diamond cutting and grinding tools and a significant amount of water based coolant. Dry ground powder can iqnite spontaneously with a small spark.

Type 2:17 amarium cobalt magnets

sintered samarium cobalt magnets Sm2Co17magnets
Typical Physical Properties - Type 2:17
Curie Temperature 800 - 825°C
Coefficient of Thermal Expansion - Perpendicular +11.0 - +12.0 x 10-6 °C-1
*Coefficient of Thermal Expansion - Parallel +9.0 - +10.0 x 10-6 °C-1
Electrical Resistivity 80 - 90 µΩ·cm
Density 8.3 - 8.4 g·cm-3
Vicker's Hardness 550 - 650 HV
Young's Modulus 140 - 150 kN·mm-2
Bending Strength 0.09 - 0.15 kN·mm-2
Compressive Strength 0.65 - 0.80 kN·mm-2
total 9 samarium cobalt magnets SM2CO17

how to Manufactured the Samarium cobalt alloys?

The SaCo alloys are typically machined in the unmagnetized state. Samarium-cobalt should be ground using a wet grinding process and a diamond grinding wheel. The same type of process is required if drilling holes or other features that are confined. The grinding waste produced must not be allowed to completely dry as samarium-cobalt has a low ignition point.

These Samarium Cobalt magnet alloys are an age hardening type with a composition of two atoms of rare earth Samarium Cobalt and 13-17 atoms of transition metals. The TM content is rich in cobalt, but contains other elements such as iron and copper. Other elements like zirconium, hafnium and such may be added in small quantities to achieve better heat treatment response. By weight the alloy will generally contain 25% of Samarium.

The maximum energy products of these alloys range from 20 MGOe to 32 MGOe. These alloys have the best reversible temperature coefficient of all rare earth alloys, typically being -0.03%/°C. The "second generation" Samarium Cobalt materials can also be used at higher temperatures. The most advanced Samarium Cobalt material offered by MCE is S3069 which has a guaranteed maximum energy product of 29.5 MGOe minimum. All the SmCo alloys with energy products that are 22 MGOe and higher that MCE offers are made from the Series 2-17 alloy.

Generally, Samarium Cobalt magnets do not need any coatings or platings after processing. Occasionally coating with advanced coatings such as PR1010 is desirable if cleanliness is an issue. The coating in this case acts much like a sealant. Oxidation is not a factor. Occasionally the Samarium Cobalt (SmCo) magnet may have some areas that have areas that discolor and appear as oxidation. This is typically due to some iron impurities and is generally not a cause for plating; the rusting appearance is typically localized in areas and after some discoloration, does not continue through the material.

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