Magnetic and Mechanical Properties of Strontium Ferrite and Nd-Fe-B Rubber Bonded Permanent Magnets

Application of permanent magnets bonded by rubber is still growing, especially in the automotive industry.Magnetic and mechanical properties of permanent rubber magnets can be tailored by a production's technology and a magnet's composition.Permanent magnets bonded by rubber are produced by a method called calendaring.Physical properties of rubber bonded permanent magnets depend on a type and amount of hard magnetic powder in a mixture with rubber.Anisotropic strontium ferrite powder and spherical isotropic Nd-Fe-B alloy powder were used in research.The results of measurements show that with an increasing amount of ferrite powder magnetic properties and Shore hardness increase whereas tensile strength decreases.Addition of Nd-Fe-B powder to the mixture instead of some ferrite slightly increases magnetic properties of magnets.