Self-Limiting Electrospray Layers for 3D-Printed Targets
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Solution Overview
Problem
Existing additive manufacturing techniques struggle with efficient application of micro/nanoscale conformal coatings on complex 3D surfaces, leading to material waste and inefficiencies due to the need for separate coating processes and the inability to redirect material away from uncoated regions.
Innovation Solution
The implementation of thickness-limited electrospray deposition (SLED) that allows for concurrent or post-processing coating during additive manufacturing, utilizing a thermo-responsive polymer solution and electric field to form self-limiting layers on conductive targets, redirecting the spray to uncoated areas and achieving precise micro/nanoscale coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spray coating techniques are used, then coating can be applied to 3D surfaces, but capillary and shadowing effects occur resulting in non-uniform coating thickness
Solution Approach 1:
The patent replaces conventional mechanical spray coating with electrospray deposition, using electric fields to control material deposition. The electrospray system uses voltage applied to a nozzle to generate charged droplets that are directed onto the substrate, eliminating capillary and shadowing effects associated with mechanical spraying while achieving uniform micro/nanoscale coating thickness.
Solution Approach 2:
The patent changes the physical parameters of the coating process by using electrospray deposition instead of conventional spray coating. By controlling voltage, flow rate, and substrate temperature, the system achieves precise control over coating thickness at the micro/nanoscale, eliminating the capillary and shadowing effects that plague conventional methods.
2Productivity
If separate coating processes are used after additive manufacturing, then coatings can be applied, but manufacturing time increases and material waste increases
Solution Approach 1:
The patent merges the additive manufacturing process with the coating process by performing electrospray deposition during or immediately after the 3D printing process. This integration eliminates the need for separate coating steps, reducing total manufacturing time and eliminating material waste associated with sequential processes.
Solution Approach 2:
The patent applies coating material to the additive manufacturing process either concurrently or immediately afterward, before the component is fully assembled or used. This preliminary coating action ensures the surface is prepared in advance without requiring separate post-processing steps, thereby reducing overall manufacturing time.
3Manufacturing precision
If existing additive manufacturing techniques are used, then components can be manufactured, but no mechanism exists to redirect material away from ejection vector toward uncoated regions
Solution Approach 1:
The electrospray deposition system inherently provides feedback control where the electric field distribution and charge accumulation on the substrate automatically direct material flow to uncoated regions. The system self-regulates based on the substrate geometry and coating progress, eliminating the need for complex external redirection mechanisms while maintaining high coating accuracy.
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 method reduces material waste and manufacturing time by ensuring coatings only cover the necessary surface, providing uniform and efficient micro/nanoscale coatings with improved uniformity and reduced material usage, applicable to complex 3D structures.
Implementation Method 1
exposing an electrically conductive target to an incident spray comprising a thermo-responsive polymer solution, in the presence of an electric field
Implementation Method 2
allowing the solution temperature to deviate toward the surface temperature to the deposited temperature at which the non-conductive polymer is immobile may prompt a spinodal decomposition of the thermo-responsive polymer solution
Implementation Method 3
allowing the non-conductive polymer to accumulate on the electrically conductive target to form a layer, having a thickness sufficient to repulse the incident spray
Data Source
AI summary
A method for simultaneous additive manufacturing and thickness-limited, electrospray deposition may include forming an electrically conductive target via additive manufacturing and exposing the electrically conductive target to an incident spray comprising a thermo-responsive polymer solution, in the presence of an electric field. The electrically conductive target may have a surface temperature, the thermo-responsive polymer solution may have a solution temperature, and the thermo-responsive polymer solution may include a non-conductive polymer. The method may further include allowing the solution temperature to deviate toward the surface temperature to a deposited temperature at which the non-conductive polymer is immobile. The method may further include allowing the non-conductive polymer to accumulate on the electrically conductive target to form a layer, having a thickness sufficient to repulse the incident spray.