Non-spherical Powder Particles for Additive Manufacturing
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Solution Overview
Problem
Powder-based additive manufacturing processes face limitations due to the inability of spherical particles to achieve 100% density, resulting in porosity that can lead to residual stress, crack formation, and degraded part performance.
Innovation Solution
Designing powder particles with non-spherical shapes and functionalized surfaces, such as flat surfaces, magnetic dipoles, and coatings, to enhance clustering or separation, allowing for up to 100% densification and improved material gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spherical or near-spheroidal particles are used as feedstock material, then ease of manufacture is improved, but packing density deteriorates (maximum 74% theoretical, 64% random)
Solution Approach 1:
The patent applies asymmetry by transitioning from spherical to non-spherical particle shapes (cubes, tetrahedrons, octahedrons, dodecahedrons, or combinations thereof). These geometric shapes enable better interlocking and filling of void spaces between particles, achieving up to 100% packing density while remaining manufacturable through controlled solidification processes.
2Ease of manufacture
If spherical particles are used, then manufacturing simplicity is improved, but porosity increases leading to residual stress and crack formation
Solution Approach 1:
The patent uses non-spherical geometric shapes (cubes, tetrahedrons, octahedrons, dodecahedrons) that pack more efficiently to minimize void spaces. This reduces porosity in the final part, eliminating nucleation sites for cracks and reducing residual stresses from phase changes during additive manufacturing.
Solution Approach 2:
The patent employs a distribution of different sized particles where smaller particles fill the void spaces between larger particles. This nested arrangement maximizes packing density and minimizes porosity, improving part reliability while maintaining manufacturing simplicity through controlled solidification.
3Quantity of substance
If non-spherical particles with flat surfaces are used, then packing density is improved (up to 100%), but particle shape control during manufacturing becomes more difficult
Solution Approach 1:
The patent utilizes phase transition from liquid to solid during particle formation. By controlling the solidification process of droplets containing geometric shape-forming agents, the method achieves precise control over particle geometry (cubes, tetrahedrons, octahedrons, dodecahedrons) while maintaining manufacturability through scalable spray or inkjet deposition techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tailored particles significantly reduce porosity, enhance part strength and longevity, improve thermal management, and enable the use of additive manufacturing in environments like space where traditional powders would be impractical, while also facilitating recycling and reducing energy costs.
Implementation Method 1
At least a subplurality of the plurality of powder particles each further include a magnetic dipole to further enhance at least one of clustering or separation of the subplurality of powder particles
Data Source
AI summary
The present disclosure relates to a plurality of powder particles configured to be joined in an additive manufacturing process to form a part. Each one of the powder particles has a determined three dimensional, non-spherical shape. The plurality of powder particles are further of dimensions enabling fitting individual ones of the powder particles in abutting relationship with one another. At least a subplurality of the powder particles each have a functionalized surface feature to enhance at least one of clustering or separation of the subplurality of powder particles.