Metallic Particle Fusing via Sinter-Then-Melt Energy Sequencing
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Solution Overview
Problem
3D printing of metallic materials often results in discontinuous metal films due to high surface energies leading to 'balling' of particles, which affects the quality and continuity of the final metal layer.
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 the formation of larger spheres and achieving 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 balling effect increases causing discontinuous metal film
Solution Approach 1:
The fusion process is divided into multiple energy levels: a first energy level for initial heating and sintering, followed by a second higher energy level for complete fusion. This segmentation allows controlled progression from partial to full fusion, preventing premature balling while achieving complete fusion.
Solution Approach 2:
A preliminary low-energy heating step is applied before the main fusion step to reduce surface energy and promote particle coalescence. This preliminary action prepares the metallic particles for subsequent high-energy fusion, preventing balling during the main fusion process.
2Loss of time
If single high energy level is used for fusion, then process time is reduced, but surface quality deteriorates due to balling
Solution Approach 1:
The fusion process is divided into multiple energy levels: a first energy level for initial heating and sintering, followed by a second higher energy level for complete fusion. This segmentation allows controlled progression from partial to full fusion, preventing premature balling while achieving complete fusion.
Solution Approach 2:
The fusion process uses periodic energy application with distinct phases: initial heating phase at lower energy, followed by fusion phase at higher energy. This periodic action with controlled timing achieves complete fusion while maintaining surface quality.
3Device complexity
If traditional single-step fusion is used, then device complexity is minimized, but metal film continuity is poor due to balling
Solution Approach 1:
The fusion process is divided into multiple energy levels: a first energy level for initial heating and sintering, followed by a second higher energy level for complete fusion. This segmentation allows controlled progression from partial to full fusion, preventing premature balling while achieving complete fusion.
Solution Approach 2:
The energy level parameter is changed in a controlled sequence during the fusion process. Starting with lower energy to reduce surface tension and promote particle bonding, then increasing to higher energy for complete fusion. This parameter progression achieves continuous metal film formation.
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 process results in improved fused metal properties with reduced porosity and a smoother surface, enhancing the continuity and quality of the metal film compared to traditional methods.
Implementation Method 1
Photonic fusing of metallic particles is based on an idea of uniformly irradiating a large area of metallic particles with a short light pulse that is sufficiently powerful to liquefy selected regions of a top layer of the metallic particles
Implementation Method 2
The certain low energy level may be an energy level that is sufficient to cause the metallic particles to sinter without being melted
Implementation Method 3
The certain high energy level may be an energy level that is sufficient to cause the sintered metallic particles to melt
Implementation Method 4
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
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.