SmCo Permanent Magnets | Sintered Samarium Cobalt 1:5 & 2:17

Description

Sintered SmCo permanent magnets (1:5 & 2:17 type) offer high energy product (up to 32 MGOe), excellent temperature stability (-270°C to 350°C), and corrosion resistance. Ideal for aerospace, motors, and precision instruments. GB/T 13560 compliant.

Sintered SmCo Permanent Magnets | Samarium Cobalt 1:5 & 2:17

Product Overview

Sintered SmCo permanent magnets are high-performance rare-earth permanent magnets based primarily on samarium and cobalt. They are known for high coercivity, excellent temperature stability, strong resistance to demagnetization and good corrosion resistance.

Commercial sintered samarium cobalt magnets are generally divided into two major material families: SmCo 1:5 (SmCo₅) and SmCo 2:17 (Sm₂Co₁₇). These two material systems provide different combinations of magnetic energy product, coercivity, temperature performance and application characteristics.

Hefei Ke Ningman New Energy Materials Technology Co., Ltd. supplies custom sintered SmCo magnets in different grades, shapes, dimensions and magnetization directions for motors, sensors, aerospace equipment, automotive components, magnetic couplings, instruments and other demanding applications.

Key Features of Sintered SmCo Magnets

• High-temperature magnetic stability

• High intrinsic coercivity

• Strong resistance to demagnetization

• Excellent corrosion resistance

• Stable magnetic performance

• SmCo 1:5 and SmCo 2:17 material systems

• Suitable for demanding industrial environments

• Available in customized shapes and dimensions

• Multiple magnetization directions available

• Suitable for high-temperature motors, sensors and precision magnetic components

What Are SmCo Permanent Magnets?

Samarium cobalt, commonly abbreviated as SmCo, is a rare-earth permanent magnet material composed primarily of samarium and cobalt.

Sintered SmCo magnets are manufactured using powder metallurgy. The manufacturing process generally involves alloy preparation, powder processing, magnetic field orientation, pressing, sintering, heat treatment, precision machining and magnetization.

SmCo is particularly valuable when an application requires high resistance to demagnetization and stable magnetic performance at elevated temperatures.

Compared with NdFeB, SmCo generally offers better high-temperature stability and corrosion resistance, while NdFeB typically provides higher magnetic energy density at room temperature.

The appropriate magnet material should therefore be selected according to the actual operating temperature, required magnetic performance, geometry, environment and cost target.

SmCo 1:5 vs SmCo 2:17 Permanent Magnets

The two major SmCo material families are SmCo 1:5 and SmCo 2:17.

SmCo 1:5 and SmCo 2:17 should not simply be considered “better” or “worse.” The appropriate choice depends on the required magnetic performance, operating temperature, magnet dimensions, magnetization conditions and application environment.

SmCo Permanent Magnet Specifications

The final properties of a SmCo magnet depend on the selected grade, chemical composition, manufacturing process and heat treatment.

Exact magnetic properties should be confirmed according to the selected grade and customer technical requirements.

SmCo Permanent Magnet Grades

Different SmCo grades are available for different magnetic performance and operating temperature requirements.

Depending on the required specification, grades can be selected based on:

• Remanence

• Intrinsic coercivity

• Maximum energy product

• Temperature stability

• Demagnetization resistance

• Operating temperature

• Magnetization requirements

For customized projects, customers can provide their required magnetic performance or application conditions and our technical team can evaluate a suitable SmCo grade.

Why Choose SmCo Permanent Magnets?

High Temperature Stability

One of the most important advantages of SmCo is its excellent performance at elevated temperatures.

SmCo is commonly selected for applications where the magnet may be exposed to high operating temperatures and where magnetic stability is more important than achieving the highest possible room-temperature magnetic energy density.

The maximum recommended operating temperature depends on the specific grade, magnet geometry and application conditions.

High Coercivity

SmCo magnets provide high intrinsic coercivity, which gives them strong resistance to irreversible demagnetization.

This characteristic is particularly important for applications exposed to:

• High temperatures

• External magnetic fields

• Demagnetizing fields

• Large temperature fluctuations

• Demanding electromagnetic environments

Excellent Corrosion Resistance

SmCo has good inherent corrosion resistance compared with many conventional NdFeB magnet grades.

This makes SmCo attractive for applications where environmental durability is important.

However, final surface treatment requirements should always be evaluated according to humidity, chemicals, salt exposure and other environmental conditions.

Strong Resistance to Demagnetization

SmCo combines high coercivity with good temperature stability, making it suitable for applications where long-term magnetic stability is critical.

Long-Term Magnetic Stability

For industrial and precision applications, maintaining predictable magnetic performance over the service life of the component can be more important than achieving maximum initial magnetic strength.

SmCo is therefore commonly selected for applications where reliability and thermal stability are major design priorities.

Sintered SmCo Magnet Manufacturing Process

1. Raw Material Preparation

Samarium, cobalt and other alloying elements required for the selected grade are prepared according to the material specification.

2. Alloy Melting

The raw materials are melted under controlled conditions to achieve the required chemical composition and material uniformity.

3. Alloy Processing and Powder Production

The alloy is processed into a fine magnetic powder suitable for powder metallurgy.

4. Magnetic Field Orientation

The magnetic powder is pressed under a controlled magnetic field so that the magnetic particles are preferentially aligned.

This orientation process is important for achieving the desired anisotropic magnetic properties.

5. Pressing and Sintering

The oriented powder is compacted and sintered under controlled conditions to produce a dense SmCo magnetic body.

6. Heat Treatment

Controlled heat treatment and aging are used to develop the required microstructure and magnetic properties.

7. Precision Machining

Sintered SmCo is a hard and relatively brittle magnetic material. Precision grinding and other suitable machining methods may therefore be required to achieve final dimensions and tolerances.

8. Magnetization

The finished magnet is magnetized according to the required magnetization direction and magnetic performance.

9. Final Inspection

Finished SmCo magnets can be inspected for dimensional accuracy, surface condition, magnetic performance and other agreed technical requirements.

SmCo Magnetic Properties

Important magnetic parameters for SmCo magnets include:

• Remanence (Br)

• Coercive force (Hcb)

• Intrinsic coercivity (Hcj)

• Maximum energy product (BH)max

• Curie temperature

• Temperature coefficient

• Demagnetization characteristics

The actual values depend on the SmCo grade and manufacturing condition.

For engineering applications, magnetic performance should be evaluated together with:

• Magnet dimensions

• Magnetic orientation

• Operating temperature

• External magnetic fields

• Required service life

• Working environment

This helps ensure that the selected SmCo grade provides sufficient performance throughout the expected operating conditions.

SmCo vs NdFeB Magnets

SmCo and NdFeB are both high-performance rare-earth permanent magnet materials, but they are suited to different applications.

Choose SmCo when:

High operating temperature is expected

High coercivity is required

Resistance to demagnetization is important

Corrosion resistance is important

Long-term magnetic stability is a priority

Consider NdFeB when:

Maximum magnetic energy density is the primary requirement

Operating temperature is within the selected NdFeB grade's limits

Compact magnetic design is important

Cost efficiency is a major consideration

The best choice depends on the complete application specification rather than magnetic strength alone.

SmCo 1:5 vs SmCo 2:17: Which Should You Choose?

SmCo 1:5

SmCo 1:5 magnets can be considered when the application requires:

Stable permanent magnetic performance

High coercivity

High-temperature capability

A balanced combination of magnetic properties and application requirements

SmCo 2:17

SmCo 2:17 magnets can be considered when:

Higher magnetic performance is required

Higher maximum energy product is important

High coercivity is required

Compact high-performance magnetic components are needed

High-temperature operation is expected

The final grade should be selected according to the required Br, Hcj, BHmax, operating temperature and magnet geometry.

Custom SmCo Magnet Shapes and Sizes

We supply sintered SmCo magnets in a range of standard and customized shapes.

Common shapes include:

• Disc magnets

• Ring magnets

• Block magnets

• Rectangular magnets

• Cylinder magnets

• Arc magnets

• Segment magnets

• Custom-shaped magnets

Customized dimensions can be manufactured according to customer drawings and technical specifications.

Available customization may include:

• Length

• Width

• Thickness

• Diameter

• Radius

• Dimensional tolerance

• Magnetization direction

• Magnetic grade

• Magnetic performance

SmCo Magnetization Options

SmCo magnets can be supplied with different magnetization configurations according to application requirements.

Common options include:

Axial Magnetization

Magnetization is oriented along the central axis of the magnet.

Radial Magnetization

Magnetization is oriented radially and is commonly used for selected ring and cylindrical magnetic components.

Diametrical Magnetization

The magnet is magnetized across its diameter.

Custom Magnetization

Special magnetization requirements can be discussed according to the customer's magnetic circuit and application design.

Applications of Sintered SmCo Magnets

SmCo magnets are widely considered for applications where high-temperature stability and resistance to demagnetization are important.

Aerospace Applications

• Aerospace actuators

• Sensors

• Navigation equipment

• Aircraft instruments

• High-temperature magnetic components

Automotive Applications

• Position sensors

• Temperature-resistant sensors

• Motors

• Actuators

• Magnetic control components

High-Temperature Motors

• SmCo is suitable for selected:

• Permanent magnet motors

• Servo motors

• Brushless motors

• High-temperature motors

• Generators

Sensors and Instrumentation

• SmCo can be used in:

• Magnetic sensors

• Position sensors

• Encoders

• Measurement equipment

• Precision instruments

Magnetic Couplings

• SmCo magnets can be considered for:

• High-temperature magnetic couplings

• Sealed pumps

• Magnetic drive systems

• Industrial transmission systems

Scientific and Precision Equipment

SmCo can also be used in selected:

• Scientific instruments

• Precision magnetic devices

• Electronic equipment

• Measurement systems

Custom SmCo Permanent Magnet Manufacturing

We support customized SmCo magnet manufacturing based on customer application requirements.

Customers can provide:

• Magnet drawing

• Material grade

• Dimensions

• Magnetic properties

• Magnetization direction

• Operating temperature

• Environmental conditions

• Required tolerance

• Annual quantity

Our technical team can evaluate the application requirements and recommend a suitable SmCo material and manufacturing specification.

SmCo Magnet Quality Control

Quality control is essential for maintaining consistent magnetic performance and dimensional accuracy.

Depending on the agreed specification, inspection may include:

• Chemical composition inspection

• Dimensional inspection

• Dimensional tolerance verification

• Surface inspection

• Density inspection

• Remanence testing

• Coercivity testing

• Maximum energy product testing

• Demagnetization curve testing

• Magnetization direction inspection

• Final product inspection

Material certification and inspection documentation can be discussed according to customer requirements.

How to Choose the Right SmCo Magnet Grade?

When selecting a SmCo permanent magnet, consider the following parameters:

• Required magnetic energy product

• Required remanence (Br)

• Required coercivity (Hcb)

• Required intrinsic coercivity (Hcj)

• Maximum operating temperature

• Magnet dimensions

• Magnetization direction

• Dimensional tolerance

• Working environment

• Corrosion requirements

• External demagnetizing field

• Annual quantity

Providing these parameters helps ensure that the selected SmCo magnet grade is appropriate for the application.

Why Choose Hefei Ke Ningman New Energy Materials Technology Co., Ltd.?

Hefei Ke Ningman New Energy Materials Technology Co., Ltd. supplies specialty magnetic alloys and functional metal materials for industrial applications.

For customized SmCo permanent magnet projects, we can support customers with:

• Material selection

• SmCo grade selection

• Custom dimensions

• Custom shapes

• Magnetic property requirements

• Magnetization requirements

• Manufacturing process consultation

• Quality inspection

• Technical documentation

• Bulk production

• Export packaging

We work with customers to match magnet material, magnetic performance, dimensions and operating conditions to the actual application.

Frequently Asked Questions About SmCo Magnets

What are SmCo permanent magnets?

SmCo permanent magnets are high-performance rare-earth permanent magnets based primarily on samarium and cobalt. They are known for high coercivity, excellent temperature stability and resistance to demagnetization.

What are the two main types of SmCo magnets?

The two major SmCo material families are SmCo 1:5 (SmCo₅) and SmCo 2:17 (Sm₂Co₁₇).

What is the difference between SmCo 1:5 and SmCo 2:17?

SmCo 1:5 and SmCo 2:17 have different chemical systems and magnetic characteristics. SmCo 2:17 generally offers higher magnetic energy product, while the appropriate choice depends on the required magnetic properties, temperature and application.

Are SmCo magnets suitable for high temperatures?

Yes. SmCo is one of the preferred permanent magnet materials for high-temperature applications because of its excellent temperature stability and resistance to thermal demagnetization.

Are SmCo magnets corrosion resistant?

Yes. SmCo generally provides excellent corrosion resistance compared with many NdFeB magnet grades. However, the required surface treatment should be evaluated according to the actual environment.

Are SmCo magnets stronger than NdFeB?

Not generally. NdFeB typically provides higher magnetic energy density, while SmCo offers better high-temperature stability and corrosion resistance.

Are SmCo magnets brittle?

Yes. Sintered SmCo is a hard and relatively brittle material. Careful handling and appropriate machining methods are required to prevent chipping or cracking.

What shapes of SmCo magnets are available?

Common SmCo magnet shapes include discs, blocks, rings, cylinders, arcs, segments and customized shapes.

Can you manufacture custom SmCo magnets?

Yes. We can manufacture customized SmCo magnets according to customer drawings, dimensions, magnetic requirements, magnetization direction and application conditions.

What information is required for an SmCo magnet quotation?

The most useful information includes magnet grade, dimensions, quantity, magnetic performance requirements, magnetization direction, maximum operating temperature and technical drawings.

Request a Custom SmCo Magnet Quote

Looking for a reliable SmCo magnet manufacturer or supplier?

Send us your magnet drawing, required SmCo grade, dimensions, magnetic properties, operating temperature and quantity.

Hefei Ke Ningman New Energy Materials Technology Co., Ltd. can evaluate your requirements and provide a suitable sintered SmCo permanent magnet solution for your application.

Contact us today for a customized SmCo magnet quotation.