Composite Particulate Build Materials for 3D Printing
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Solution Overview
Problem
In 3D powder bed printing, non-spherical smaller particles with high aspect ratios are difficult to spread evenly due to separation from polymeric particles during layering, leading to uneven reinforcement distribution and reduced structural properties in printed parts.
Innovation Solution
A composite particulate build material is developed, where reinforcing particles with high aspect ratios are physically embedded or attached to the surface of polymeric particles, allowing for homogeneous dispersion throughout the printed part, enhancing structural properties by maintaining even distribution during the printing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-spherical smaller particles with high aspect ratios are used as reinforcing particles, then structural properties (strength and stiffness) are improved, but the particles are difficult to spread evenly and separate from polymeric particles during layering
Solution Approach 1:
The patent combines reinforcing particles with polymeric particles into a single composite particulate build material where the reinforcing particles are physically embedded within or attached to the polymeric particles. This merging ensures homogeneous dispersion throughout the printed part while maintaining the reinforcing effect, directly resolving the separation issue during layering.
Solution Approach 2:
The invention creates a composite particulate build material consisting of polymeric particles combined with reinforcing particles having high aspect ratios. This composite structure allows the reinforcing particles to maintain their shape and distribution characteristics while being integrated into the polymeric matrix, achieving both strength improvement and even distribution.
2Manufacturing precision
If reinforcing particles are physically embedded or attached to polymeric particles, then homogeneous dispersion is achieved, but the process complexity increases
Solution Approach 1:
The patent performs the embedding or attaching of reinforcing particles to polymeric particles during the material preparation phase before 3D printing. This preliminary action ensures that the reinforcing particles are pre-positioned and secured within the polymeric particles, eliminating the need for complex in-process adjustments during layering and reducing overall process complexity.
Solution Approach 2:
The invention modifies the physical and chemical parameters of the particulate build material by controlling the size, shape, and surface properties of both polymeric and reinforcing particles. By optimizing parameters such as particle size distribution, aspect ratio ranges, and surface energy characteristics, the embedding process achieves homogeneous dispersion through controlled material properties rather than complex mechanical processes.
Data Source
AI summary
The present disclosure is drawn to a composite particulate build material, including 92 wt % to 99.5 wt % polymeric particles having an average size from 10 μm to 150 μm and an average aspect ratio of less than 2:1. The composite particulate build material further includes from 0.5 wt % to 8 wt % reinforcing particles having an average size of 0.1 μm to 20 μm and an average aspect ratio of 3:1 to 100:1 applied to surfaces of the polymeric particles, wherein the reinforcing particles include mica or glass.