3D Printer Pressing Die for Ceramic Granule Fragmentation
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Solution Overview
Problem
3D printing of ceramic materials faces challenges in achieving uniform layers and efficient sintering due to the high melting temperatures and low flowability of sub-micron sized ceramic particles, leading to imprecise shapes and compromised mechanical strength in the final parts.
Innovation Solution
The use of build material granules with sizes greater than 10 μm, composed of primary ceramic particles and a thermally-decomposable binder, which are spread and pressed to form uniform layers, and then fused using a fusing agent, allowing for complete solid state sintering and densification of the parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sub-micron sized ceramic particles are used for 3D printing, then fine detail precision is improved, but flowability deteriorates leading to non-uniform layers
Solution Approach 1:
The ceramic build material is segmented into granules containing primary ceramic particles bound together by a binder material. This segmentation allows the material to flow like granules while containing the fine sub-micron ceramic particles needed for precision, resolving the contradiction between fine detail precision and flowability.
Solution Approach 2:
The invention uses composite granules consisting of primary ceramic particles (providing fine detail precision) bound with a binder material (providing flowability). This composite structure combines the benefits of both fine particles and flowable granules, eliminating the trade-off between precision and ease of layer formation.
2Manufacturing precision
If sub-micron sized ceramic particles are used, then fine detail precision is improved, but sintering becomes difficult due to high melting temperatures
Solution Approach 1:
The binder material is designed to decompose at a lower temperature than the ceramic particles' melting point. By changing the thermal parameters of the build material through the binder, the sintering process can occur at temperatures where the binder decomposes first, leaving a porous structure that allows complete sintering of the ceramic particles without requiring their full melting temperature.
Solution Approach 2:
The binder material performs a preliminary action by decomposing before the ceramic particles sinter. This preliminary decomposition creates porosity and facilitates the subsequent sintering process, making it easier to achieve complete densification of fine ceramic particles without needing to reach their high melting temperatures.
3Device complexity
If conventional 3D printing methods are used with ceramic materials, then layer formation is simplified, but uniformity deteriorates due to low flowability
Solution Approach 1:
By segmenting the ceramic material into flowable granules with embedded primary particles, the material gains granule-like flow properties that enable uniform layer formation using conventional spreading mechanisms, while maintaining the fine particle structure needed for precision and uniformity.
Solution Approach 2:
The invention changes the physical state parameter of the ceramic material from loose fine particles to bound granules. This parameter change improves flowability and layer uniformity while the binder decomposition during sintering restores the fine particle structure for precision, resolving the contradiction between layer formation simplicity and layer uniformity.
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 method enables the formation of fully densified and sintered 3D parts with fine detail precision, improving mechanical strength and uniformity while maintaining flowability for uniform layer formation.
Implementation Method 1
a pressing die positioned above the build area platform that is to apply pressure onto the layer of build material granules to fragment the build material granules into the primary particles to increase the density of the layer of build material granules
Implementation Method 2
allowing for complete solid state sintering and densification of the parts
Implementation Method 3
exposed to heating and/or radiation to melt or sinter, densify, fuse, and harden the green body to form the 3D part
Implementation Method 4
composed of primary ceramic particles and a thermally-decomposable binder
Data Source
AI summary
According to an example, a three-dimensional (3D) printer may include a spreader to spread build material granules into a layer on a build area platform, a pressing die positioned above the layer of spread build material granules, in which the pressing die is to apply pressure onto the layer of build material granules to fragment the build material granules into primary particles to increase the density of the layer of build material granules, and a printhead to selectively deposit a fusing agent between the primary particles of the spread layer of build material granules.