Thermoplastic Polymer Stabilization for Ceramic Additive Manufacturing
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Solution Overview
Problem
Thermoplastic polymers used in additive manufacturing for ceramic production deform during pyrolysis due to melting behavior, while thermoset polymers are difficult to process in additive methods, leading to geometric instability and low carbon yield.
Innovation Solution
Stabilizing thermoplastic polymers with nanofillers and crosslinking agents to enhance dimensional stability and carbon yield, using materials like polyaryletherketones and carbon nanotubes, and applying thermal or radiation crosslinking to maintain shape integrity during pyrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermoplastic polymers are used in additive manufacturing for ceramic production, then ease of manufacture is improved, but geometric stability deteriorates due to melting behavior during pyrolysis
Solution Approach 1:
The patent applies preliminary crosslinking treatment to the thermoplastic polymer before additive manufacturing. The polymer is crosslinked in advance to form a stable three-dimensional network structure, which prevents melting and deformation during subsequent pyrolysis while maintaining additive manufacturing processability
Solution Approach 2:
The patent creates a composite material system combining thermoplastic polymer with crosslinking agents and ceramic precursors. This composite structure provides both the processability of thermoplastics and the dimensional stability of crosslinked networks, enabling successful additive manufacturing of ceramic green bodies
2Shape
If thermoset polymers are used to maintain shape stability during pyrolysis, then geometric stability is improved, but ease of manufacture deteriorates due to difficulty in additive processing
Solution Approach 1:
The patent inverts the conventional approach by using thermoplastic polymers (typically known for poor high-temperature stability) and applying crosslinking treatment to achieve the shape stability normally associated with thermosets. This allows retention of thermoplastic processability while gaining thermoset-like dimensional stability
3Ease of manufacture
If thermoplastic polymers are used without stabilization, then ease of manufacture is improved, but carbon yield deteriorates during pyrolysis
Solution Approach 1:
The patent introduces crosslinking agents and ceramic precursors as intermediary substances that mediate between the thermoplastic polymer and the final ceramic product. These intermediaries facilitate carbon retention during pyrolysis and promote the formation of a stable carbon framework that serves as a precursor for ceramic material
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
Enables the production of high-quality ceramic structures with multi-material functionality and reduced shrinkage, maintaining geometric integrity and increasing carbon yield through the stabilization of thermoplastic polymers during pyrolysis.
Implementation Method 1
pyrolyzed at a temperature below 2000 °C to a brown body of carbon
Implementation Method 2
the polymer material is mixed with a stabilizing agent... the polymer material of the green body is stabilized completely or in parts
Implementation Method 3
the green body is built up from a meltable polymer material, which is deposited in its molten state
Implementation Method 4
they exhibit an inherent softening at the glass transition temperature and/or the melting temperature of the polymer
Implementation Method 5
the brown body is processed into a silicon carbide-containing ceramic object by contacting it with liquid silicon and undergoing silicon infiltration
Data Source
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AI summary
The invention relates to a method for the additive manufacturing of a green body (28) from a polymer material. The green body (28) can be pyrolyzed to form a brown body (30) of carbon. The brown body (30) can then be further processed by silicon infiltration into a ceramic object (32) comprising silicon, carbon, and silicon carbide. The fused deposition modeling (FDM) process is particularly suitable as an additive manufacturing method. The polymer material is a thermoplastic polymer. Since thermoplastic polymers can melt under pyrolysis conditions, resulting in the loss of shape of the green body (28), the thermoplastic polymer is stabilized before pyrolysis according to the invention.Several stabilization strategies are proposed: a) thermo-oxidative aging of the polymer material just below the temperature at which the polymer material softens; b) mixing the polymer material with nanofilling materials and, if necessary, microfilling materials before additive manufacturing of the green body (28); c) chemical or thermal crosslinking of the polymer material or crosslinking of the polymer material by radiation after additive manufacturing of the green body (28). The stabilized green body (28) obtained in this way can then be pyrolyzed to form a brown body (30). The brown body (30) is further processed into a ceramic object (32) by silicon infiltration.