Metallic Particle Fusing with Two-Stage Energy to Prevent Balling
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Solution Overview
Problem
In 3D printing, existing methods for fusing metallic particles often result in a discontinuous metal film due to high surface energies leading to 'balling' of particles, which affects the quality and continuity of the metal layer formed.
Innovation Solution
A multi-step fabrication process involving the application of energy at multiple levels, starting with a low energy level to sinter metallic particles and reduce surface energies, followed by a high energy level to fuse them into a continuous film, thereby minimizing 'balling' and ensuring a smoother, more continuous metal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high energy level is applied to fuse metallic particles, then fusion speed is improved, but particle balling increases causing discontinuous metal film
Solution Approach 1:
The fusion process is divided into two distinct stages: a first energy level stage for initial particle fusion, and a second energy level stage for completing the fusion and removing oxides. This segmentation allows each stage to be optimized independently, preventing particle balling while achieving continuous metal film formation.
Solution Approach 2:
The first energy level is applied preliminarily to fuse metallic particles before the second energy level is applied. This preliminary fusion action prepares the particles for subsequent complete fusion while minimizing surface energy effects that cause balling.
2Device complexity
If single energy level is used for fusing metallic particles, then process complexity is reduced, but metal film quality deteriorates due to porosity and discontinuity
Solution Approach 1:
The fusion process is divided into two distinct stages: a first energy level stage for initial particle fusion, and a second energy level stage for completing the fusion and removing oxides. This segmentation allows each stage to be optimized independently, preventing particle balling while achieving continuous metal film formation.
Solution Approach 2:
The energy level parameter is changed between two distinct stages: a first energy level for initial fusion and a second energy level for complete fusion and oxide removal. This parameter change enables optimization of each stage for its specific function, improving metal film quality while maintaining manageable process complexity.
3Ease of operation
If high surface energy is present in metallic particles, then particle mobility is improved, but particle balling increases reducing film continuity
Solution Approach 1:
The fusion process is divided into two distinct stages: a first energy level stage for initial particle fusion, and a second energy level stage for completing the fusion and removing oxides. This segmentation allows each stage to be optimized independently, preventing particle balling while achieving continuous metal film formation.
Solution Approach 2:
The first energy level is applied preliminarily to fuse metallic particles before the second energy level is applied. This preliminary fusion action prepares the particles for subsequent complete fusion while minimizing surface energy effects that cause balling.
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
This process enhances the formation of a continuous or almost continuous metal film with reduced porosity, improving the quality and smoothness of the metal layer compared to traditional methods, by controlling the energy levels and application times based on the type of metal and particle characteristics.
Implementation Method 1
a low energy level is applied onto a layer of metallic particles to sinter the metallic particles and form physical connections between adjacent ones of the metallic particles
Implementation Method 2
a high energy level is applied onto the layer of metallic particles to melt the metallic particles and fuse them into a continuous or almost continuous metal layer
Implementation Method 3
Due to the relatively high surface energies of liquefied metal, this process may result in some of the metallic particles instantaneously 'balling' when liquefied and subsequently solidifying in the 'balled' form
Data Source
Figure 1~2
Figure 3
Figure 4~5C
AI summary
According to an example, an apparatus may include a processor and a memory on which is stored instructions. The instructions may cause the processor to control at least one energy source to apply energy at a certain low energy level onto a layer of metallic particles, in which the metallic particles have micron-level dimensions, and in which application of the certain low energy level may sinter the metallic particles and may cause formation of physical connections between adjacent ones of the metallic particles. The instructions may also cause the processor to control the at least one energy source to apply energy at a certain high energy level onto the layer of metallic particles, in which application of the certain high energy level energy may melt and fuse the sintered metallic particles.