Immiscible-Interface Metal Drawing for Isotropic Structures
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Solution Overview
Problem
Existing metal additive manufacturing techniques face issues such as the staircase effect, residual stress, and highly-oriented columnar microstructures, which affect the surface finish and mechanical properties of final components, particularly in metal 3D printing.
Innovation Solution
A layerless additive manufacturing process using immiscible interfaces and rheological behaviors of metal and ceramic colloidal suspensions to fabricate self-supported, isotropic metal structures by continuously extruding a metal colloidal suspension within a secondary matrix colloidal suspension, eliminating the need for support structures and achieving homogeneous microstructures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional layer-by-layer metal additive manufacturing is used, then metal components can be fabricated with complex shapes, but the staircase effect and highly-oriented columnar microstructures occur, degrading surface finish and mechanical properties
Solution Approach 1:
The patent changes the fundamental processing parameter from layer-by-layer deposition to continuous extrusion of metal colloidal suspension. This parameter change eliminates the discrete layer interfaces that cause the staircase effect, achieving smooth surface finish while maintaining complex shape fabrication capability through programmable extrusion paths
Solution Approach 2:
The patent introduces an intermediary colloidal suspension system where metal particles are suspended in a liquid medium. This intermediary state allows the metal to be extruded continuously in a controlled manner, preventing the formation of columnar microstructures while enabling complex geometric shaping before final sintering
2Productivity
If traditional layer-by-layer metal additive manufacturing is used, then metal components can be fabricated, but residual stress and highly-oriented columnar microstructures occur, degrading mechanical properties
Solution Approach 1:
The patent changes the microstructure formation parameter by using continuous extrusion followed by sintering instead of layer-by-layer melting. This eliminates the highly-oriented columnar microstructures that form due to directional solidification in traditional methods, producing more isotropic microstructures with superior mechanical properties
Solution Approach 2:
The patent replaces the thermal-mechanical process of layer-by-layer melting and solidification with a colloidal extrusion and sintering process. This substitution avoids the formation of residual stresses and columnar microstructures associated with directional solidification, achieving better mechanical properties
3Shape
If support structures are used in traditional metal 3D printing, then complex shapes can be maintained during printing, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses the colloidal suspension medium as an intermediary support system. The metal particles suspended in liquid can be extruded in any orientation without requiring solid support structures, as the liquid medium provides immediate support and shape maintenance during the extrusion process
Solution Approach 2:
The patent enables self-supported fabrication where the extruded metal colloidal suspension maintains its own shape through the viscosity and surface tension of the liquid medium. The process inherently supports complex geometries without external support structures, eliminating the need for their removal and reducing device complexity
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 complex metal lattice structures without the staircase effect, with improved mechanical properties and surface finish, and is cost-effective by allowing the fabrication of various metal alloy materials without the need for support structures.
Implementation Method 1
A layerless additive manufacturing process using immiscible interfaces and rheological behaviors of metal and ceramic colloidal suspensions
Implementation Method 2
fabricate self-supported, isotropic metal structures by continuously extruding a metal colloidal suspension within a secondary matrix colloidal suspension
Implementation Method 3
evaporating at least one of the first and second liquids by heating to a temperature high enough to facilitate evaporation of the first and second liquids
Implementation Method 4
heating the matrix suspension and the second suspension to a temperature high enough to dry the matrix suspension and the second suspension and high enough to sinter the target powder
Data Source
AI summary
A method of three-dimensional printing of target material can include filling a receptacle with a matrix suspension comprising a powder matrix suspended in a first liquid. A second suspension can be extruded into the matrix suspension, where the second suspension can include a target powder suspended in a second liquid.