Fugitive Metal Precursor Binder for Distortion-Resistant Binder Jet Parts
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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
Incorporation of a fugitive metal precursor in 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 green strength is maintained, but brown strength is insufficient causing distortion and damage during post-printing processes
Solution Approach 1:
A fugitive metal precursor is introduced as an intermediary substance that temporarily provides structural support during the transition from green state to sintered state. The precursor fills voids between particles and provides bridging contact, acting as a mediator that enhances brown strength without interfering with the final sintering process. After serving its supportive function, the precursor decomposes and is removed, having fulfilled its temporary role.
Solution Approach 2:
The binder solution composition is modified by incorporating a fugitive metal precursor that changes its physical and chemical parameters during the heating process. The precursor transitions from a solid particulate form that provides structural support to a decomposed state, thereby dynamically adjusting the brown strength characteristics during post-printing processes to prevent distortion and damage.
2Strength
If fugitive metal precursor is added to binder solution, then brown strength and stiffness are improved, but binder solution complexity increases
Solution Approach 1:
The binder solution is formulated as a composite material system combining conventional binder components with a fugitive metal precursor. This composite approach integrates multiple functional elements: the binder provides green strength, the fugitive metal precursor provides brown strength enhancement, and the solvent enables delivery of all components. The composite structure allows each component to contribute its specific function while working synergistically.
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
a fugitive metal precursor that decomposes during debinding and sintering, providing contact and bridging between powder particles
Implementation Method 2
sintering of the particulate material, thereby improving the brown strength and overall stiffness of the printed part
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.