Engineered Powders for 3D Printing with Sodium Silicate Binders
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Solution Overview
Problem
Current 3D printing methods face limitations due to a limited materials palette and slow build speeds, with existing powders being expensive and restricted to a small number of polymers, and traditional binders burning at high temperatures, which is undesirable for applications like aerospace.
Innovation Solution
The use of engineered powders such as emulsion aggregation and chemically-produced toner powders, which offer improved control over particle size, morphology, and surface energy, and the adoption of sodium silicate as a binder that does not burn, allowing for the production of 3D objects with enhanced properties and wider material selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional binders are used in 3D printing, then the printing process can be completed, but the binders burn at high temperatures which is undesirable for aerospace applications
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by switching from traditional organic binders to inorganic sodium silicate. This parameter change fundamentally alters the thermal behavior, eliminating burning while maintaining binding functionality at high temperatures, thus resolving the contradiction between completing the printing process and avoiding burning.
Solution Approach 2:
The patent creates a composite binder system using sodium silicate that combines inorganic properties for high-temperature stability with binding capabilities. This composite approach allows the binder to withstand aerospace application temperatures without burning, resolving the reliability issue.
2Reliability
If precipitated powders are used in SLS process, then good mechanical properties and thermal characteristics are achieved, but the powders are expensive and limited to a small number of polymers
Solution Approach 1:
The patent develops a universal powder processing method using emulsion polymerization that can be applied to multiple polymer types (polyolefins, polyesters, polyamides, etc.). This single methodology serves multiple material needs, replacing the need for separate precipitated powder processes for each polymer, thus achieving both good mechanical properties and wide material versatility.
Solution Approach 2:
The patent changes the powder production parameters by using emulsion polymerization instead of precipitation or grinding. This parameter change in the synthesis method enables control over particle size (30-150 microns) and morphology while expanding the range of usable polymers, resolving the contradiction between material quality and material diversity.
3Manufacturing precision
If conventional powder methods are used, then polymer particles can be produced, but particle size control and surface morphology are limited
Solution Approach 1:
The patent changes the fundamental parameters of particle production by using emulsion polymerization with controlled monomer addition and specific formulation conditions. This allows precise control over particle size (30-150 microns) and surface morphology (smooth, spherical) while maintaining ease of manufacture through a standardized process, resolving the precision-ease contradiction.
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 faster and more efficient 3D object fabrication with improved quality, reduced costs, and the ability to use a broader range of materials, including those previously difficult to process, while avoiding burning issues at high temperatures.
Implementation Method 1
substrate layers held together by sodium silicate binder
Implementation Method 2
heating element that transforms electrical energy to thermal energy sufficient to melt the engineered powder
Implementation Method 3
The melted powder then solidifies, bonding layers of substrate together
Data Source
AI summary
A three-dimensional object comprises stacked substrate layers infiltrated by a hardened material comprising engineered powder that is transformed into a substance that flows and subsequently hardens into the hardened material in a spatial pattern that infiltrates positive regions, and does not infiltrate negative regions, in the substrate layers. The powder may be emulsion aggregation powder, chemically-produced toner powder, or a combination. It may be a thermoplastic or thermosettable polymer and may include nylon, elastomers, polyolefins, polyethylene, polyether ether ketone, polyimide, polyetherimide, polyphenylene sulfide, polystyrene, polypropylene, polymethyl methacrylate, and polyaryletherketone, or a combination. The powder particles may have a pre-specified controlled shape and/or a non-homogenous composition. Surface treatments and/or additives may be used to control powder flow and charge distribution. Each substrate layer may be a sheet-like structure comprising fibers held together by binder. The binder may include sodium silicate.