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US 11,590,717 B2Granted
Extrudable magnetic ink and novel 3D printing method to fabricate bonded magnets of complex shape
AssigneesUT-Battelle, LLC, Iowa State University Research Foundation, Inc.
InventorsBrett G. Compton, Mariappan Parans Paranthaman, Orlando Rios, Cajetan I. Nlebedim
Life of this patent
Estimating the term…
Abstract
A magnetic ink composition for three-dimensional (3D) printing a bonded magnet is provided. The magnetic ink composition includes magnetic particles, a polymer binder and a solvent. A 3D printing method for fabrication of a bonded magnet using the magnetic ink composition is also provided.
Claims24
An extrudable magnetic ink composition for printing a bonded magnet comprising:
- magnetic particles having a particle size of at least 500 microns, wherein the magnetic particles are present in the magnetic ink composition in an amount of 35% to 70% by volume;
- an epoxy polymer binder;
- a latent curing agent comprising an imidazole derivative containing a dicyanimide;
- viscosifier;
- and
- a solvent,
- wherein the amount of magnetic particles along with viscosifier together impart the extrudable magnetic ink composition with a viscoelastic shear thinning behavior for applying the extrudable magnetic ink composition as a feed material in 3D printing.
4 more elements
An extrudable magnetic ink composition for printing a bonded magnet, the composition consisting of:
- magnetic particles having a particle size of at least 500 microns;
- an epoxy polymer binder present in the extrudable magnetic ink composition in an amount of about 20 vol %;
- optionally, a latent curing agent comprising an imidazole derivative containing a dicyanimide present in the extrudable magnetic ink composition in an amount of about 1 pph based on the mass of the epoxy polymer binder;
- viscosifier selected from the group consisting of nanoclay platelets and fumed silica and present in the extrudable magnetic ink composition in an amount of about 1 vol %;
- and
- a solvent present in the extrudable magnetic ink composition in an amount of about 0.25 pph based on the mass of the epoxy polymer binder;
- wherein the amount of magnetic particles along with viscosifier together impart the extrudable magnetic ink composition with a viscoelastic shear thinning behavior for applying the extrudable magnetic ink composition as a feed material in 3D printing.
4 more elements
Dependencies are inferred from the claim text.