Sacrificial Photocurable Shells for Ceramic 3D Printing Cleanup
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Solution Overview
Problem
The manufacturing of ceramic and metallic green pieces with complex shapes using additive processes faces challenges such as the difficulty in cleaning and supporting cantilevered parts, and creating hollow passages without specialized tools or chemical cleaning agents.
Innovation Solution
Building pieces within a shell or hull made of sacrificial photocurable material that is cured and then debinded, allowing for optimized cleaning and support of cantilevered parts, and enabling the creation of hollow spaces without the need for tools or chemical products, using a method that involves forming layers of photocurable composition and sacrificial organic material, which are cured and then debinded to release the piece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pieces are built using conventional additive manufacturing with photocurable composition, then the piece can be manufactured layer by layer, but the piece becomes embedded in non-cured paste requiring difficult cleaning operations
Solution Approach 1:
The invention extracts the piece from the photocurable composition by introducing a sacrificial material that encapsulates the piece. The sacrificial material is then removed through debinding, effectively taking the piece out from the difficult-to-clean paste environment and replacing it with a removable supporting matrix.
Solution Approach 2:
The sacrificial material acts as an intermediary between the piece and the external environment. It provides a removable medium that facilitates piece extraction and cleaning, serving as a temporary supporting structure that can be easily removed through debinding without damaging the piece.
2Adaptability or versatility
If pieces with cantilevered parts are manufactured, then complex geometries can be achieved, but the cantilevered parts collapse without additional support structures
Solution Approach 1:
The sacrificial material is deposited in advance to form a supportive matrix before the piece is fully constructed. This preliminary action creates internal support structures within the sacrificial material that prevent cantilevered parts from collapsing during the manufacturing process, allowing complex geometries to be maintained.
3Shape
If hollow passages are created in pieces, then three-dimensional geometries are achieved, but specialized tools and chemical cleaning agents are required to clean the passages
Solution Approach 1:
The sacrificial material is removed from hollow passages through debinding, effectively extracting the supporting medium from difficult-to-reach areas. This eliminates the need for specialized cleaning tools and chemical agents, as the sacrificial material can be removed uniformly from all accessible surfaces including internal passages.
4Reliability
If excess sacrificial material is used for the shell or hull, then piece protection and support are improved, but material usage efficiency decreases
Solution Approach 1:
The sacrificial material is deposited with varying local properties - denser in regions requiring stronger support and more sparse in areas requiring less support. This local quality variation optimizes the balance between providing adequate piece support and minimizing sacrificial material usage, preventing both over-use and under-use in different regions.
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 simplifies the cleaning process, supports complex geometries, and allows for the creation of hollow parts without additional tools or chemicals, optimizing material usage and ensuring the successful production of finished pieces through sintering.
Implementation Method 1
forming, on a working tray, one or more pieces to be manufactured based on a ceramic or metallic photocurable composition (CPC or MPC) comprising: a mineral part consisting of at least one powdered ceramic material or at least one powdered metallic material; and an organic part able to be destroyed by heating during the debinding, and comprising at least one photocurable monomer and/or oligomer and at least one photoinitiator
Implementation Method 2
the one or more green pieces being then subjected to debinding and sintering operations in order to obtain finished pieces
Data Source
AI summary
The disclosed method includes selecting a suspension ceramic or metal photocurable composition (CPC or MPC); preparing a sacrificial organic material (SOM) forming a photocurable layer destroyed by heating; for manufacturing pieces, on the working tray, forming successive layers of SOM cured by irradiation, the one or more CPC or MPC-based pieces being manufactured by machining a recess in a layer of cured SOM; depositing the CPC or MPC within the recesses; curing the CPC or MPC to obtain a hard horizontal surface level with the adjacent layer of cured SOM, when forming each recess, it is delimited by previously defined patterns, the depth(s) selected in order to ensure the continuity of the one or more pieces to be manufactured; and obtaining one or more green pieces inserted in the SOM, which are subjected to debinding by heating in order to destroy the SOM in which they are trapped.