3D-Printed SiC Ceramic Composition With Reduced Free Silicon
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Solution Overview
Problem
Ceramic components with silicon carbide (SiC) face limitations in chemical stability and temperature resistance due to inhomogeneous microstructure compositions, particularly the presence of large regions of free silicon and carbon, which are not effectively addressed by existing 3D-printing methods.
Innovation Solution
A method involving the creation of a green body using 3D-printing, followed by impregnation with a solution or resin system comprising different resins and solvents, resulting in a fine-pored, sponge-like carbon skeleton that is subsequently siliconized, significantly reducing free silicon regions and increasing SiC content, thereby enhancing chemical stability and temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional 3D-printing method is used to produce C/Si/SiC composite material, then manufacturing complexity is reduced and production is simplified, but the microstructure becomes inhomogeneous with large regions of free silicon, reducing chemical stability and temperature resistance
Solution Approach 1:
The patent introduces a porous carbonaceous green body as the substrate for silicon infiltration. The porous structure allows liquid silicon to penetrate and react uniformly throughout the material, converting free silicon regions into SiC while maintaining the geometric complexity achieved through 3D printing. This resolves the contradiction by enabling homogeneous microstructure formation without compromising manufacturing simplicity.
Solution Approach 2:
The patent modifies the carbonization parameters to create a green body with controlled porosity and surface characteristics that facilitate uniform silicon infiltration. By adjusting carbonization temperature, heating rate, and atmosphere conditions, the green body structure is optimized to enable complete silicon penetration and reaction, transforming the inhomogeneous microstructure into a homogeneous SiC-rich structure while maintaining the 3D-printed geometric complexity.
2Device complexity
If conventional siliconisation process is applied to 3D-printed green body, then production process remains simple, but large lakes or regions of free silicon persist, limiting temperature resistance to below 1414°C
Solution Approach 1:
The patent performs preliminary carbonization of the 3D-printed green body before silicon infiltration to create a stable porous carbon structure. This preliminary action ensures that the green body has optimal porosity and surface area for subsequent silicon penetration, enabling complete conversion of free silicon regions into SiC during infiltration. This resolves the temperature resistance limitation by ensuring thorough silicon reaction without requiring additional complex process steps.
3Ease of manufacture
If free silicon is present in C/Si/SiC composite material, then the material can be produced with simpler processing, but the operating temperature is limited to below the melting point of silicon (1414°C)
Solution Approach 1:
The patent converts the harmful effect of free silicon (which limits temperature resistance) into a beneficial process mechanism. The free silicon present in the green body after carbonization is intentionally used as the silicon source for infiltration and reaction with carbon to form SiC. This transforms the temperature-limiting free silicon into the raw material for creating high-temperature resistant SiC structure, eliminating the operating temperature limitation while maintaining processing simplicity.
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 method produces ceramic components with improved chemical stability, higher hardness, and increased temperature resistance by converting free silicon regions into SiC, leading to enhanced mechanical and thermal properties.
Implementation Method 1
impregnating the green body with a solution selected from the group consisting of a sugar solution, a starch solution or a cellulose solution, or a resin system comprising a mixture containing at least one resin, at least one solvent and at least one curing agent
Implementation Method 2
drying or curing the impregnated green body
Implementation Method 3
carbonising the dried or cured green body, wherein a fine-pored, foam-like carbon skeleton is created
Implementation Method 4
siliconising the carbonised green body by infiltration with liquid silicon
Implementation Method 5
the carbon reacts with silicon and forms silicon carbide
Data Source
AI summary
A ceramic component, wherein the component contains 20 to 60 wt. % SiC, 5 to 40 wt. % free silicon and 10 to 65 wt. % free carbon. The disclosure also relates to the use of the component. The method for producing the ceramic component includes the following steps: a) providing a green body based on carbon, which has been produced by means of a 3D-printing method, b) impregnating the green body with a solution selected from the group consisting of a sugar solution, a starch solution or a cellulose solution, or a resin system including a mixture containing at least one resin, at least one solvent and at least one curing agent, wherein the at least one resin and the at least one solvent are different, c) drying or curing the impregnated green body.