Direct-Write Additive Manufacturing of Molten Metal Beads
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Solution Overview
Problem
Current additive manufacturing technologies, particularly for metals, face challenges in efficiently producing 3D objects with high melting point materials due to limitations in material selection, high costs, and poor control over deposited materials, leading to low dimensional tolerances and build quality.
Innovation Solution
Development of an alloy comprising aluminum or nickel with cerium or lanthanide elements, which forms a eutectic intermetallic phase, allowing for structural direct-write additive manufacturing by extruding beads with controlled surface tension and forming a stabilizing shell that fuses upon contact, enabling efficient layer formation and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If powder-bed melting techniques (laser selective melting or electron beam melting) are used for metal additive manufacturing, then high melting point materials can be processed, but the cost is high and material selection is limited
Solution Approach 1:
The patent replaces expensive laser/electron beam thermal fields with a mechanical extrusion system that directly deposits molten metal beads. The extrusion system uses mechanical force to push molten metal through a nozzle, eliminating the need for high-cost laser or electron beam equipment while maintaining the ability to process high melting point materials.
Solution Approach 2:
The patent employs inexpensive consumable wire feedstock that is melted and extruded directly. Unlike expensive metal powders used in traditional methods, the wire form allows for cheaper material usage and reduces waste, making the process economically attractive while maintaining material versatility.
2Ease of manufacture
If welding-based additive manufacturing with electrical arc is used, then metal deposition is achieved, but control of deposited materials is poor resulting in low dimensional tolerances
Solution Approach 1:
The patent changes the fundamental parameters of the deposition process by using controlled extrusion of molten metal beads instead of arc welding. The extrusion process allows precise control of bead size, shape, and placement through mechanical means, while the specific alloy composition (containing rare earth elements) provides controlled surface tension and wetting properties that enable accurate bead formation and positioning.
Solution Approach 2:
The patent implements process control through monitoring and adjustment of extrusion parameters including temperature, extrusion rate, and bead deposition patterns. The alloy composition is specifically designed to provide consistent surface tension and wetting characteristics that enable predictable bead behavior and self-alignment, creating an inherently controllable process.
3Productivity
If structural direct-write additive manufacturing is used, then costs are lower and processing time is reduced, but suitable metallic materials need to be developed
Solution Approach 1:
The patent develops composite metallic alloys combining base metals (Al, Ni, Fe, Cu) with rare earth elements (Ce, La, Pr, Nd). This composite approach creates materials with tailored properties including controlled surface tension, improved wetting characteristics, and enhanced mechanical properties, making the materials specifically suited for direct-write extrusion while maintaining compatibility with high melting point requirements.
Solution Approach 2:
The patent modifies material parameters by incorporating rare earth elements that change the surface tension, melting characteristics, and flow properties of the base metal. These parameter changes enable the metal to be extruded in controlled bead forms at lower temperatures than traditional methods, increasing processing speed while maintaining material versatility across different base metal systems.
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 alloy allows for the creation of 3D metallic objects with enhanced mechanical properties and improved build quality, reducing costs and time compared to traditional metal additive manufacturing methods while enabling the use of a wider range of materials.
Implementation Method 1
a surface tension of the liquid material ranging from about 0.3 N/m to 2.0 N/m
Implementation Method 2
A eutectic intermetallic of the alloying elements is present in the alloy in an amount ranging from about 0.5 wt. % to 7.5 wt. %
Data Source
AI summary
An alloy for structural direct-writing additive manufacturing comprising a base element selected from the group consisting of aluminum (Al), nickel (Ni) and a combination thereof, and a rare earth element selected from the group consisting of cerium (Ce), lanthanide (La) and a combination thereof, and a eutectic intermetallic present in said alloy in an amount ranging from about 0.5 wt. % to 7.5 wt. %. The invention is also directed to a method of structural direct-write additive manufacturing using the above-described alloy, as well as 3D objects produced by the method. The invention is also directed to methods of producing the above-described alloy.