3D-Printed Graphite Parts Through Thermal Stabilization
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Solution Overview
Problem
Existing 3D printing methods using thermally meltable plastics cannot produce graphitized molded parts due to remelting or deformation at high temperatures required for graphitization.
Innovation Solution
A method involving 3D printing with a meltable plastic filament, followed by stabilization at controlled temperatures to enhance dimensional stability, and subsequent high-temperature graphitization under inert conditions to convert the plastic into graphite without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermally meltable plastic filament is used for 3D printing, then ease of manufacture and device simplicity are improved, but the plastic deforms or remelts at high temperatures required for graphitization
Solution Approach 1:
The patent applies preliminary stabilization treatment to the printed plastic structure before graphitization. The plastic is pre-heated to temperatures between 80-200°C for extended periods (1-48 hours) to gradually remove moisture and stabilize its molecular structure. This preliminary action prevents sudden deformation during subsequent high-temperature graphitization, resolving the contradiction between ease of manufacture and dimensional stability.
Solution Approach 2:
The patent changes the temperature and time parameters of thermal treatment to resolve the contradiction. By using extended stabilization times at moderate temperatures (80-200°C) before graphitization, the plastic structure is gradually prepared to withstand the subsequent high-temperature treatment without deforming, thus maintaining both ease of manufacture and dimensional stability.
2Reliability
If high temperature treatment is applied for graphitization, then graphitized molded parts are produced, but the plastic structure deforms or loses integrity
Solution Approach 1:
The patent performs preliminary stabilization heating at 80-200°C for extended periods before graphitization. This gradual pre-treatment removes moisture and stabilizes the plastic molecular structure, preventing sudden deformation when high temperatures are applied for graphitization, thus maintaining both graphitization quality and structure integrity.
Solution Approach 2:
The patent uses rapid heating rates (5-20°C/min) during the graphitization phase to quickly pass through the critical temperature range where deformation could occur. By rushing through the problematic temperature zone rapidly after stabilization, the plastic is converted to graphite before significant deformation can happen, resolving the contradiction between graphitization quality and structure integrity.
3Stability of the object's composition
If extended stabilization treatment is applied, then dimensional stability is improved, but production time increases
Solution Approach 1:
The patent optimizes the stabilization parameters by using temperatures between 80-200°C for extended periods (1-48 hours). This parameter range is carefully selected to achieve sufficient dimensional stability without requiring excessively long treatment times, balancing dimensional stability improvement with reasonable production time.
Solution Approach 2:
The patent implements a two-stage periodic thermal treatment: first stabilization at 80-200°C for 1-48 hours, then graphitization at higher temperatures. This periodic approach with distinct phases allows the material to progressively adapt to heat, achieving dimensional stability more efficiently than continuous heating would provide, thus reducing overall production time while maintaining stability.
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 graphitized molded parts with retained structure integrity, suitable for applications like catalyst supports and filters, by stabilizing the printed structure through controlled thermal treatment and graphitization.
Implementation Method 1
Printing a 3D structure with a 3D printer using a meltable plastic filament by melting the filament and applying it layer by layer
Implementation Method 2
Stabilizing the printed 3D structure made from the filament material by means of a temperature treatment for chemical or crystallographic modification of the plastic
Implementation Method 3
The stabilized 3D structure is then carbonized at a high temperature and finally graphitized, which takes place at a temperature of >1,800 °C, preferably at >2,000 °C
Implementation Method 4
finally graphitized, which takes place at a temperature of >1,800 °C, preferably at >2,000 °C
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
The invention relates to a method for producing graphitised formed parts by means of 3D printing from conventional filaments made of a plastic. The invention intends to provide a simplified method for producing graphitised 3D formed parts, or another three-dimensional structure made of a thermoplastic material by means of 3D printing. This is achieved by melting a filament made of a meltable and curable plastic and applying same layer by layer by means of the 3D printer until the desired structure has been created, stabilising the 3D structure (1) printed from the material of the filament by way of temperature treatment to chemically or crystallographically change the plastic in that pre-stabilisation at ᷉180 °C is carried out over a longer period, followed by a stabilisation step at ᷉250 °C until the printed 3D structure (1) is sufficiently dimensionally stable as a stabilised structure (8) and a carbonising or graphitising of the 3D structure, to produce the graphitised structure (9).