Abstract
For this study, different strontium ferrite powders were mixed with a filling ratio of about 60 vol% in a binder system and formed into green compacts. During the process of injection molding, a magnetic field was generated in the tool via a magnetic coil, which enables magnetization and orientation of the ceramic particles. All powders were successfully processed by MagnetPIM. The investigations identified that it is impossible to extrapolate from the magnetic properties of a green compact to the magnetic properties of a sintered part. It became obvious, though, that, when producing very strong magnetic parts by MagnetPIM, the best results can be obtained by using powders with small particle sizes.
Highlights
The process of powder injection molding can be classified into ceramic injection molding and metal injection molding
The use of magnetically anisotropic strontium ferrite powder in the powder injection molding process represents an option to produce three-dimensional, multipolar sintered magnets that combine the benefits of the injection molding process to those of sintered magnets
It is essential for the process of MagnetPIM that the powder particles can be magnetized and oriented during the process of injection molding
Summary
The process of powder injection molding can be classified into ceramic injection molding and metal injection molding. Both benefit from the geometric freedom of the injection molding process, making it possible to produce complex, precise, and small ceramic or metal components in high volumes [1]. By using magnetically ceramic [2,3,4,5,6,7] or metal powders [8] in the process of powder injection molding sintered magnets can be produced. The use of magnetically anisotropic strontium ferrite powder in the powder injection molding process represents an option to produce three-dimensional, multipolar sintered magnets that combine the benefits of the injection molding process to those of sintered magnets. For the injection molding of highly filled powder compounds, low viscosity is required, and the melt must be shear-thinning
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