Arc-Melted Refractory Wire for Dense Metal Additive Manufacturing
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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 conventional precursor materials, which are exacerbated by high concentrations of volatile impurities.
Innovation Solution
Fabrication of wires with reduced gaseous and volatile impurities, such as oxygen, sodium, and phosphorus, using arc melting in a vacuum or inert ambient, followed by mechanical deformation into a wire suitable for additive manufacturing, minimizing impurities and enabling the creation of high-density metallic parts with reduced defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional precursor materials are used in additive manufacturing, then the manufacturing process can proceed, but sparking, blistering, and splattering occur due to volatile impurities
Solution Approach 1:
The precursor material undergoes preliminary processing (arc melting in vacuum or inert atmosphere) before additive manufacturing to remove volatile impurities. This pre-treatment eliminates the source of sparking and splattering that would occur during subsequent melting operations.
Solution Approach 2:
Arc melting is performed in a vacuum or inert atmosphere to prevent oxidation and minimize volatile impurity formation in the precursor material. This creates a controlled environment that reduces harmful emissions during subsequent additive manufacturing processes.
2Productivity
If conventional precursor materials are used in additive manufacturing, then the process can be completed, but excessive porosity and cracking result in the final part
Solution Approach 1:
The precursor material is pre-processed through arc melting to create a homogeneous, low-porosity structure before additive manufacturing. This preliminary densification prevents porosity and cracking from developing during the layer-by-layer construction process.
Solution Approach 2:
The microstructure and chemical composition of the precursor material are modified through arc melting parameters (temperature, atmosphere, duration) to achieve optimal density and reduce susceptibility to cracking during subsequent manufacturing.
3Ease of manufacture
If conventional precursor materials are used, then additive manufacturing can proceed, but insufficient density and poor machinability are achieved
Solution Approach 1:
The precursor material undergoes preliminary arc melting to achieve high density and fine microstructure before additive manufacturing. This pre-densification ensures that the final part achieves superior density and machinability without requiring post-processing interventions.
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 metallic parts with densities greater than 96% of theoretical density, minimizing porosity and cracking, and allowing for successful layer-by-layer fabrication with minimal sparking and splattering, enhancing the machinability and quality of the final product.
Implementation Method 1
The precursor wire itself may include, consist essentially of, or consist of one or more refractory metals... The precursor wire is fabricated, at least partially, via arc melting in a vacuum or a substantially inert ambient
Implementation Method 2
The tip of the wire is melted by, e.g., an electron beam or a laser
Implementation Method 3
The tip of the wire is melted by, e.g., an electron beam or a laser
Implementation Method 4
the molten wire traces out the pattern of a substantially two-dimensional slice of the final part; in this manner, the final part is fabricated in layer-by-layer fashion via melting and rapid solidification of the wire
Data Source
AI summary
In various embodiments, wire composed at least partially of arc-melted refractory metal material is utilized to fabricate three-dimensional parts by additive manufacturing.