Overview of Magnetic Materials

This document provides detailed information on various types of magnetic materials, their properties, dimensions, and applications, particularly focusing on permanent magnets and magnetic tools used in industrial settings.

Types of Permanent Magnets and Their Characteristics

The document compares key magnetic properties of different permanent magnets, including residual magnetic flux density (Br) and holding power (BHC). The main types covered are:

• Anisotropic Ferrite Magnets: Br of 0.36–0.42 T (3600–4200 G), BHC of 239–271 kA/m (3000–3400 Oe).
• Rare Earth Magnets: Samarium-Cobalt with Br 0.98–1.06 T and BHC 477–637 kA/m; Neodymium with Br 1.0–1.33 T and BHC 836–995 kA/m.
• Alnico Magnets: Br 1.28–1.35 T but lower holding power (52–58 kA/m).

Rubber Magnet Sheets

Flexible rubber magnet sheets are available in anisotropic and isotropic types with different magnetic strengths:

• Anisotropic Rubber Magnets: Br 0.22–0.23 T, BHC 159–174 kA/m.
• Isotropic Rubber Magnets: Br 0.14–0.15 T, BHC 100–111 kA/m.

Sheets come in various thicknesses, widths, and lengths, with options for solid colors and colored sheets. Magnetization patterns include one-face multi-poles and two-face magnetization, with distinctions between lustrous and non-lustrous finishes.

Magnet Shapes and Sizes

Magnets are available in round and rectangular shapes with detailed size specifications in millimeters and inches. Examples include round magnets with diameters from 15 mm to 100 mm and thicknesses from 3 mm to 15 mm, and rectangular magnets with sizes up to 100 mm × 100 mm.

Alnico Magnets

Cast magnets made primarily of iron, aluminum, nickel, and cobalt, offering high residual flux density and temperature stability. Sizes range from small diameters (3 mm) to larger sizes (up to 25 mm diameter and 60 mm length).

Rare Earth Magnets (Samarium-Cobalt and Neodymium)

These magnets provide very strong magnetic forces with high thermal stability and corrosion resistance (Samarium-Cobalt) or highest magnetic force and mechanical strength (Neodymium). Available in both rectangular and round shapes with detailed size options.

Simple Magnetic Holders

These consist of isotropic ferrite magnets covered by iron yokes, designed for low-cost attraction purposes. They are dimensionally less precise and not recommended for integration into jigs or fixtures. Various models with specific yoke and magnet dimensions are listed.

Key Recommendations and Notes

• Ordering magnets may require minimum quantities depending on size and type.
• Special sizes are available upon request beyond the standard dimensions listed.
• Magnetization types and finishes affect magnetic performance and application suitability.

Summary

This document serves as a comprehensive reference for selecting magnetic materials and components based on magnetic properties, sizes, shapes, and intended industrial applications such as lifting magnets, magnetic separators, and welding tools. It emphasizes the importance of choosing the right magnet type (anisotropic vs isotropic, rare earth vs ferrite) and provides detailed dimensional data to assist in specification and ordering.