Polymeric Surface Additive for 3D Metal Printing Powder Flow
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Solution Overview
Problem
Current 3D metal printing powders face issues with inter-particle interactions leading to poor flow, packing, and recycling, resulting in weak, irregularly shaped parts with high porosity, and existing additives like silica are not effective due to chemical incompatibility and high melting temperatures, causing contamination.
Innovation Solution
A polymeric surface additive prepared by emulsion polymerization is applied to the 3D metal printing powder, which improves flow and blocking performance, is chemically compatible with the powder, and can be formulated to be crosslinked or non-crosslinked, melting during the sintering process without contaminating the part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inorganic additives like silica are used to improve flow and blocking performance, then powder flow is improved, but the additives cause chemical incompatibility and high melting temperature leading to contamination
Solution Approach 1:
The patent changes the chemical composition parameter from inorganic (silica) to organic polymer materials, fundamentally altering the material properties to achieve compatibility with metal powders while maintaining flow improvement functionality and eliminating contamination issues
Solution Approach 2:
The organic polymer additives are designed to be temporary agents that fulfill their function during printing and then decompose completely, leaving no permanent residue or contamination in the final part
2Ease of operation
If inorganic additives are used to improve powder flow, then flow performance is enhanced, but the high melting temperature causes the additives to not melt during sintering, leading to contamination
Solution Approach 1:
The patent changes the thermal property parameter by selecting organic polymers with decomposition temperatures below the sintering temperature, ensuring the additives melt/decompose during the sintering process rather than remaining as solid contaminants
Solution Approach 2:
The organic polymer additives undergo phase transition from solid to liquid/decomposed state during sintering, allowing them to fulfill their flow-modifying function and then disappear without contamination
3Ease of operation
If high amounts of inorganic additive material are used to achieve desired flow performance, then flow and blocking performance is improved, but the high density of inorganic additives increases the total additive material required
Solution Approach 1:
The patent changes the density parameter by using organic polymers with lower density compared to inorganic materials like silica, thereby reducing the total mass and volume of additive material needed to achieve the same flow performance
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 polymeric additive enhances the density and strength of printed parts, allows for effective recycling, and reduces the need for high amounts of additive material due to its lower density compared to inorganic additives, ensuring smooth sintering and minimal contamination.
Implementation Method 1
A polymeric surface additive prepared by emulsion polymerization is applied to the 3D metal printing powder
Implementation Method 2
can be formulated to be crosslinked or non-crosslinked, melting during the sintering process without contaminating the part
Data Source
AI summary
A composition including a three-dimensional metal printing powder; an organic polymeric additive on at least a portion of an external surface of the three-dimensional metal printing powder; and optionally, an inorganic additive on at least a portion of an external surface of the three-dimensional metal printing powder. A process for preparing a three-dimensional metal printing powder having an organic polymeric additive disposed thereon. A process for employing the three-dimensional metal printing powder including selective laser sintering.