Grade 34 Samarium-cobalt Magnet

Overview

Coatings

While SmCo magnets inherently resist oxidation, optional coatings are available for specialized applications:

Nickel (Ni): Enhances solderability for PCB integration and provides a polished finish for medical devices

Parylene: Used in vacuum or biocompatible environments (e.g., MRI components) to prevent particulate shedding

Epoxy/Stainless Steel Cladding: Protects against mechanical wear in industrial settings (e.g., oil drilling sensors)

Gold/Zinc: For high-frequency applications (e.g., microwave tubes) requiring low electrical resistivity

Applications

Grade 34 SmCo magnets are deployed in high-tech and harsh-environment sectors:

Aerospace/Defense: Satellite gyroscopes, missile guidance systems, and jet engine sensors (FAA-compliant fuel systems)

Medical: MRI gradient coils (0.1 T/m precision) and surgical robotics due to biocompatibility and thermal stability

Energy: Downhole drilling sensors (175°C+ environments) and wind turbine generators

Electronics: Traveling wave tubes (10–40 GHz operation) and high-temperature micro-motors

FAQs

How does Grade 34 compare to NdFeB?

SmCo 34 has lower Br than NdFeB but outperforms in high-temperature and corrosive environments, with negligible demagnetization at 300°C

Is machining possible?

Yes, but only with diamond tools or EDM due to brittleness (flexural strength: 150–180 N/mm²)

Why is SmCo 34 expensive?

High samarium/cobalt content and complex sintering/aging processes drive costs (~$40–80/kg for Sm)

Can it operate in cryogenic conditions?

Yes, stable performance from -65°C to 350°C, ideal for space applications

Does it require adhesive bonding?

Epoxy or mechanical clamping is recommended for assembly to avoid stress fractures