3D Printing Multi-Material Layer Uniformity via Sequential Thermal Processing
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Solution Overview
Problem
In three-dimensional printing, the use of materials with different properties, such as electrically conductive and insulating materials, poses challenges due to differing curing and sintering conditions, leading to structural deformities and voids as the materials have different volumetric reduction rates during the additive manufacturing process.
Innovation Solution
An additive manufacturing system and method that coordinates the curing, drying, and sintering of materials with different properties by using a controller to modify the application of these materials based on quantified properties, ensuring appropriate exposure times and sequences to prevent adverse interactions and maintain layer integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If materials with different properties (e.g., conductive and insulating materials) are used in the same layer, then functional complexity is improved, but structural uniformity deteriorates due to different volumetric reduction rates causing voids and deformities
Solution Approach 1:
The system performs preliminary actions by separating the curing, drying, and sintering processes into distinct sequential steps. Insulating polymer material is cured first at lower temperatures, then conductive metallic material is sintered afterward at higher temperatures. This preliminary separation of processing steps prevents the high heat required for metallic material from adversely affecting the polymer structure, while maintaining structural uniformity despite different volumetric reduction rates.
Solution Approach 2:
The processing of multi-material layers is segmented into distinct phases: first curing the insulating polymer material, then drying the metallic colloidal solution, and finally sintering the metallic particles. This segmentation allows each material to undergo its required thermal processing without adversely affecting the other, resolving the contradiction between functional complexity and structural uniformity.
2Reliability
If high temperature is applied to fuse metallic colloidal solution, then electrical conductivity is improved, but polymer structure deteriorates due to exposure to higher heat
Solution Approach 1:
The polymer curing is performed as a preliminary action before the high-temperature metallic material sintering. The insulating structure is fully cured at lower temperatures first, establishing a stable polymer structure that can subsequently withstand the high heat required for metallic material fusion without deterioration.
Solution Approach 2:
The processing uses periodic action by applying different temperature regimes at different time periods: a first temperature regime for curing polymer material, then a second higher temperature regime for sintering metallic material. This temporal separation of thermal processing conditions allows each material to achieve its required properties without adverse effects on the other.
3Productivity
If materials are cured and sintered simultaneously, then processing time is reduced, but layer uniformity deteriorates due to different volumetric reduction rates
Solution Approach 1:
The system performs preliminary curing of polymer material before sintering metallic material, ensuring that each material undergoes its required processing in the optimal sequence. This preliminary separation of steps maintains layer uniformity by accounting for different volumetric reduction rates, while still achieving efficient overall processing through automated coordination of the sequential steps.
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 approach enables the reliable and level formation of layers in three-dimensional printed objects by managing the distinct properties of materials, reducing deformities and voids, and ensuring accurate layer formation.
Implementation Method 1
an electrically insulating structure made with an ultraviolet (UV) curable polymer
Implementation Method 2
the metallic solutions need much higher temperatures to fuse together
Implementation Method 3
the volume of the metallic colloidal solution is significantly reduced as the water or solvent is volatized
Data Source
AI summary
A method of manufacturing a three-dimensional object operates components in an additive manufacturing system with reference to a difference between quantifications identified for different properties of at least two materials in a same layer. The method enables the layer to be formed with compensation for the differences in the quantifications of the properties of the two materials.