Patterned FFF Filament for Controlled Metal Foam Porosity
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Solution Overview
Problem
Current methods for producing metal foams face limitations such as poor surface finish, casting defects, and inefficiencies in mass production, particularly in forming complex structures.
Innovation Solution
The use of a patterned filament in fused filament fabrication (FFF) where the primary material is distributed in a specific cross-sectional pattern, allowing for the formation of metal foams without melting, using binders that can be selectively removed to create voids or cavities, thereby overcoming the limitations of traditional casting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional casting methods are used to produce metal foams, then mass production is possible, but casting defects and poor surface finish occur
Solution Approach 1:
The patent changes the fundamental manufacturing parameter from melting and casting to solid-state sintering of patterned filaments. This parameter change eliminates casting defects and poor surface finish while maintaining ease of manufacture through a different process mechanism that inherently produces higher quality surfaces.
Solution Approach 2:
The patent utilizes phase transition by heating the filament to sintering temperature, which is below the melting point of the metal powder. This controlled phase transition allows the metal particles to bond without melting, avoiding casting defects while maintaining processability.
2Manufacturing precision
If patterned filament with distributed primary material is used, then controlled porosity and microstructure are achieved, but filament manufacturing complexity increases
Solution Approach 1:
The patent segments the filament cross-section into distinct regions: a patterned core containing distributed primary material particles and a binder, surrounded by a sacrificial binder layer. This segmentation allows controlled porosity when the sacrificial binder is removed, while the extrusion system manages complexity through modular material delivery.
Solution Approach 2:
The patent introduces a sacrificial binder as an intermediary material that is easily removable after extrusion. This intermediary allows the complex patterned structure to be formed during extrusion, then simplified by removing the sacrificial component to create the desired porosity without requiring complex post-processing equipment.
3Shape
If binder is removed to create voids and cavities, then metal foam structure is formed, but material loss occurs
Solution Approach 1:
The patent applies discarding by removing the sacrificial binder to create the foam structure. The removed binder material can potentially be recovered and reused, minimizing waste. The process intentionally discards the sacrificial component while preserving and densifying the primary metal material through sintering.
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
This method enables the production of metal foams with controlled porosity and microstructure, avoiding defects and enhancing production efficiency, suitable for applications like abradable coatings, heat exchangers, and high-temperature support structures.
Implementation Method 1
heating the fused filament fabricated component to sinter the primary material
Implementation Method 2
heating the fused filament fabricated component to sinter the primary material to form a sintered part
Data Source
AI summary
In general, techniques are described for a patterned filament for fused filament fabrication. An additive manufacturing system may include a substrate defining a major surface, a filament delivery device, and a computing device. The computing device may be configured to control the filament delivery device to deposit a filament on the substrate, the filament including a primary material and a first binder, where the primary material distributed in a pattern having a first cross sectional geometry that differs from a second cross sectional geometry of the filament, and the binder is configured to be substantially removed from the filament.