Binder Jet Binder Composition for Higher Brown Strength
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Solution Overview
Problem
Conventional binder solutions for binder jet 3D printing do not provide sufficient brown strength to prevent distortion and damage to printed parts during post-printing processes, such as debinding and sintering.
Innovation Solution
Incorporating a fugitive metal precursor into the binder solution that decomposes during debinding and sintering, providing contact and bridging between powder particles to enhance brown strength and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binder solutions are used for binder jet 3D printing, then the green strength is adequate for handling, but the brown strength is insufficient to prevent distortion and damage during post-printing processes
Solution Approach 1:
The binder solution combines a thermoplastic binder with a fugitive metal precursor to create a composite binding system. The thermoplastic binder provides green strength for handling, while the fugitive metal precursor enhances brown strength during post-printing processes. This composite approach allows both strength requirements to be met simultaneously without compromise.
Solution Approach 2:
The invention changes the chemical composition parameters of the binder solution by incorporating specific fugitive metal precursors (such as zinc acetate, nickel formate, or copper chloride) at controlled concentrations (0.5-40 wt%). These parameter changes enable the binder to provide both adequate green strength and improved brown strength, resolving the contradiction between handling requirements and post-printing durability.
2Strength
If the binder solution is designed to provide sufficient brown strength, then distortion and damage are reduced, but the complexity of the binder formulation increases
Solution Approach 1:
The fugitive metal precursor serves multiple functions: it enhances brown strength, acts as a sintering aid, and provides structural support during debinding. This multi-functionality reduces the need for additional separate additives or complex formulation components, thereby managing complexity while achieving the desired brown strength.
Solution Approach 2:
By optimizing the concentration of the fugitive metal precursor within a specific range (0.5-40 wt%), the invention achieves sufficient brown strength without requiring excessive complexity in the formulation. The parameter optimization allows for a balanced, manageable binder system that meets performance requirements.
3Strength
If a fugitive metal precursor is added to the binder solution, then brown strength and stiffness are improved, but the manufacturing process complexity increases
Solution Approach 1:
The fugitive metal precursor is pre-incorporated into the binder solution formulation before printing. This preliminary action ensures that the enhanced brown strength is achieved automatically during the standard binder jetting process, without requiring additional manufacturing steps or complex process modifications.
Solution Approach 2:
The fugitive metal precursor performs self-service functions during the post-printing processes: it remains in place to provide structural support during debinding, then decomposes in a controlled manner during sintering to leave behind the desired metal structure. This self-service capability simplifies the overall manufacturing process by eliminating the need for separate support removal 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
The fugitive metal precursor improves the brown strength and stiffness of printed parts, reducing cracking and distortion, and enabling the formation of complex features and large parts.
Implementation Method 1
Incorporating a fugitive metal precursor into the binder solution that decomposes during debinding and sintering
Implementation Method 2
sintering of the particulate material
Implementation Method 3
the thermoplastic binder bonds the particulate material of the plurality of layers of particulate material
Implementation Method 4
curing the applied binder solution to evaporate the solvent
Data Source
AI summary
A binder solution comprises a fugitive metal precursor, a thermoplastic binder, and a solvent. The fugitive metal precursor may comprise an alkaline earth metal, a transition metal, a post-transition metal, a metalloid, a rare earth metal, or combinations thereof. The fugitive metal precursor may comprise a salt such as carboxylate, nitrate, sulfate, carbonate, formate, chloride, halide, derivatives thereof, and combinations thereof. A method of manufacturing a part includes depositing a layer of particulate material on a working surface, selectively applying a binder solution into the layer of particulate material in a pattern representative of a layer of the part, repeating the steps of depositing and selectively applying to form a plurality of layers of particulate material with the applied binder solution, and curing the applied binder solution in the plurality of layers of particulate material with the applied binder solution to evaporate the solvent and form a green body part.