Low-Impurity Metal Wire for Crack-Free High-Density 3D Parts
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Solution Overview
Problem
Additive manufacturing of metallic parts faces challenges such as sparking, blistering, splattering, porosity, cracking, and insufficient density due to the melting of metallic precursor materials, which are exacerbated by high concentrations of volatile impurities like oxygen, sodium, and phosphorus.
Innovation Solution
The development of wires with reduced volatile impurities, such as oxygen, sodium, and phosphorus, fabricated through arc melting in a vacuum or inert ambient, which are then used in additive manufacturing processes to produce high-density, crack-free metallic parts by minimizing impurity concentrations below specific ppm levels, and utilizing refractory metals like niobium, tantalum, rhenium, tungsten, and molybdenum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional metallic precursor materials are used in additive manufacturing, then the manufacturing process can be performed, but the resulting parts exhibit excessive porosity, cracking, and insufficient density
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the precursor material, specifically reducing volatile element concentrations (oxygen, sodium, phosphorus, sulfur, potassium, calcium, antimony) to below 20 ppm each. This compositional parameter change eliminates the source of defects during melting, achieving high-density parts without porosity or cracking
Solution Approach 2:
The patent employs an inert atmosphere (vacuum or inert gas environment) during the arc melting process to prevent oxidation and minimize contamination of the precursor material. This inert environment protects the material from gaining volatile impurities during processing, ensuring high purity and defect-free parts
2Ease of manufacture
If metallic precursor materials with high volatile impurity concentrations are melted during additive manufacturing, then the melting process occurs, but sparking, blistering, and splattering occur
Solution Approach 1:
The patent converts the potential harm of volatile impurities into a benefit by using controlled arc melting in a vacuum or inert atmosphere. The arc melting process actually helps to vaporize and remove volatile impurities from the precursor material, transforming the harmful effect into a purification mechanism that eliminates sparking, blistering, and splattering
Solution Approach 2:
The inert atmosphere (vacuum or inert gas) during arc melting prevents oxidation and minimizes contamination while allowing controlled vaporization of volatiles. This environment enables the melting process to proceed smoothly without generating harmful sparks, blisters, or splatter
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 approach results in the successful fabrication of high-density metallic parts with minimal defects, achieving densities greater than 96% of theoretical density without porosity or cracking, and enabling their use in various applications including MIG welding and as refractory crucibles.
Implementation Method 1
The precursor wire is fabricated, at least partially, via arc melting in a vacuum or a substantially inert ambient
Implementation Method 2
arc melting in a vacuum or a substantially inert ambient
Implementation Method 3
the tip of the wire is melted by, e.g., an electron beam or a laser
Implementation Method 4
the tip of the wire is melted by, e.g., an electron beam or a laser
Data Source
AI summary
In various embodiments, three-dimensional layered metallic parts are substantially free of gaps between successive layers, are substantially free of cracks, and have densities no less than 97% of the theoretical density of the metallic material.