3D Printer Nitrogen Atmosphere for Metal Oxidation Control
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Solution Overview
Problem
3D printing of metallic objects using magnetohydrodynamic printers faces issues with oxidation due to high oxygen levels, leading to the formation of passivated metal oxide layers that reduce the mechanical properties of the printed objects.
Innovation Solution
A 3D printer system that includes a nozzle, a heating element to melt metal, a coil to jet liquid metal, and a gas source to maintain an oxygen concentration below 5% within an enclosure, using inert gases like nitrogen to minimize oxide formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid metal is jetted in a normal atmosphere, then the printing process can proceed, but oxygen oxidizes the liquid metal forming passivated oxide layers that reduce mechanical properties
Solution Approach 1:
The patent applies an inert atmosphere (nitrogen or argon) within the enclosure to prevent oxidation of liquid metal drops. The gas source introduces inert gas to maintain oxygen concentration below 5%, creating a protective environment that eliminates the harmful oxidative reaction while allowing the printing process to proceed normally.
2Manufacturing precision
If oxygen concentration is reduced below 5%, then oxide formation is minimized, but the system requires complex gas control mechanisms
Solution Approach 1:
The system uses a membrane nitrogen generator that automatically produces and introduces nitrogen gas to maintain the required oxygen concentration level. The generator self-regulates to keep oxygen below 5% without requiring complex external control systems, allowing the process to maintain itself with minimal intervention.
3Object-affected harmful factors
If inert gas is introduced into the enclosure, then oxygen concentration decreases below 5%, but energy is consumed by the gas generation and introduction system
Solution Approach 1:
The membrane nitrogen generator is an energy-efficient device that produces inert gas on-demand without requiring high energy input. It selectively separates nitrogen from air using membrane technology, consuming minimal energy while continuously maintaining the required low oxygen environment throughout the printing process.
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 system effectively reduces oxide formation on the printed metallic objects, enhancing their mechanical properties by controlling the atmosphere around the printing area.
Implementation Method 1
a heating element configured to heat a solid metal in the ejector, thereby causing the solid metal to change to a liquid metal within the ejector
Implementation Method 2
MHD printer, which is suitable for jetting liquid metal and its alloys layer upon layer
Implementation Method 3
the atmosphere around the falling liquid metal drop may include oxygen, which oxidizes the falling liquid metal drop, forming a passivated layer of metal oxide
Data Source
AI summary
A three-dimensional (3D) printer includes an ejector having a nozzle. The 3D printer also includes a heating element configured to heat a solid metal in the ejector, thereby causing the solid metal to change to a liquid metal within the ejector. The 3D printer also includes a coil wrapped at least partially around the ejector. The 3D printer also includes a power source configured to supply one or more pulses of power to the coil, which cause one or more drops of the liquid metal to be jetted out of the nozzle. The 3D printer also includes a substrate configured to support the one or more drops as the one or more drops solidify to form a 3D object. The 3D printer also includes a gas source configured to cause an oxygen concentration to be less than about 5% proximate to the one or more drops, the 3D object, or both.