3D Printing Filament Composition for Metal and Ceramic Objects
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Solution Overview
Problem
Current 3D printing technologies for ceramic and metallic objects are limited, as they often require costly methods and result in suboptimal quality due to volumetric flow errors and mechanical properties of thermoplastic filaments, which compromise the integrity and handling of printed objects.
Innovation Solution
A composition comprising a metal and/or ceramic powder, a binder, and a copolymer such as poly(ethylene-vinyl acetate) (PEVA) with varying vinyl acetate proportions, formulated into a filament with specific mechanical and thermoplastic properties to address the challenges of FDM 3D printing, including debinding and sintering processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thermoplastic filaments are used for FDM 3D printing, then the printing process is affordable and precise, but volumetric flow errors compromise the quality of the printed product
Solution Approach 1:
The patent modifies the thermoplastic composition by incorporating ceramic or metal powders with specific particle size distributions and using controlled rheology additives to stabilize volumetric flow during extrusion, thereby maintaining printing quality while improving flow consistency
Solution Approach 2:
The invention creates composite filaments by combining thermoplastic matrices with ceramic or metal powders, where the composite structure allows the material to maintain structural integrity while achieving consistent volumetric flow and high printing quality
2Strength
If the filament is made sufficiently rigid to be gripped by the extruder, then it can be fed properly, but it becomes difficult to coil and handle
Solution Approach 1:
The patent adjusts the filament's mechanical properties by controlling the thermoplastic composition and adding plasticizers or flexibilizers, achieving an optimal balance where the filament is rigid enough for extruder gripping but flexible enough for coiling and handling
Solution Approach 2:
The invention creates regions of varying stiffness within the filament structure, allowing the extruder gripping zone to be more rigid while the handling zones maintain flexibility, optimizing both feeding and manipulation characteristics
3Ease of operation
If the filament is made flexible to be coiled and handled, then it is easy to manipulate, but it loses rigidity needed for proper extrusion gripping
Solution Approach 1:
The patent precisely controls the flexibility parameters of the thermoplastic matrix through composition adjustment and additive selection, ensuring the filament remains flexible for handling while maintaining sufficient rigidity for extrusion gripping
4Manufacturing precision
If the formerly melted material is used for ceramic or metal FDM printing, then the green body can be formed, but the material may melt during sintering compromising the printed object
Solution Approach 1:
The patent selects thermoplastic materials with melting points significantly lower than the sintering temperature, and uses controlled cooling rates to ensure rapid solidification, creating a green body structure that remains stable throughout the sintering process
Solution Approach 2:
The invention forms a stable green body structure with controlled porosity and binder distribution before sintering, preparing the material to withstand subsequent thermal processing without compromising object integrity
5Adaptability or versatility
If current 3D printing technologies for ceramic and metallic objects are used, then objects can be printed, but costly methods and suboptimal quality result
Solution Approach 1:
The patent develops a universal thermoplastic-based filament system that can print both ceramic and metal objects using standard FDM technology, eliminating the need for specialized expensive equipment while maintaining quality
Solution Approach 2:
The invention uses conventional thermoplastic materials and standard FDM printers instead of expensive specialized equipment, accepting that the temporary green body structure will be transformed during sintering to achieve the final durable product
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 solution provides a novel feedstock material that meets mechanical and thermoplastic requirements, enabling the production of high-quality ceramic and metallic 3D printed objects with improved handling and integrity, while maintaining the advantages of FDM precision and affordability.
Implementation Method 1
a binder and a copolymer, preferably poly (ethylene-vinyl acetate)
Implementation Method 2
The nozzle head heats the material and turns the flow on and off
Implementation Method 3
the model (or part of it) is produced by extruding small beads or streams of material which harden immediately to form layers
Implementation Method 4
The green body is usually debinded from the non-ceramic or non-metal material and sintered to the final form of the 3D printed object. Sintering takes place by thermal treatment of the green body
Data Source
AI summary
The present invention relates to a composition suitable for 3D printing in the form of a filament that comprises 45 to 60 % (v/v) of a metal and/or ceramic powder; 7 % to 25% (v/v) of a binder; and at least 5 % (v/v) of a mixture of medium and high vinyl acetate proportion poly (ethylene-vinyl acetate). The invention further relates to a filament coil, a 3D printing machine, a green shaped body and a shaped body comprising the composition of the present invention. Lastly, the invention relates to a method for 3D printing by using the composition of the invention.