Silicon Consumable Cores for Clean Channels in Reaction-Bonded Ceramics
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Solution Overview
Problem
Conventional methods for producing ceramic components with internal features, such as channels, face challenges with excess glue forming beads that clog small channels, and alternative bonding techniques suffer from poor corrosion resistance and thermal conductivity.
Innovation Solution
A method involving the use of a silicon consumable core to form ceramic components without adhesives, where silicon in the shape of internal features is used within a preform, melted, and infiltrated to create open channels, eliminating the need for glue and bond lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If SiC-based glue is used to bond preform pieces, then the ceramic component can be assembled, but excess glue forms beads that clog small channels
Solution Approach 1:
The patent removes the harmful element (SiC-based glue) from the system entirely. Instead of using adhesive to bond preform pieces, the invention uses a consumable silicon core that is melted and reacted away during the reaction bonding process, leaving no residual material in the channels. This extraction of the problematic bonding material eliminates the glue bead formation that clogs small channels.
Solution Approach 2:
The patent introduces a consumable silicon core as an intermediary element during manufacturing. This silicon core serves as a placeholder and reaction medium that facilitates the bonding process without remaining in the final product. The silicon reacts with carbon during reaction bonding to form SiC, effectively mediating the assembly while being completely consumed, thus leaving clean channels.
2Manufacturing precision
If glass bonding is used to avoid excess glue, then channel clogging is prevented, but corrosion resistance and thermal conductivity deteriorate
Solution Approach 1:
The patent achieves homogeneity by using silicon carbide material throughout the entire structure. The consumable silicon core reacts with carbon to form SiC, which is the same material as the preform pieces. This ensures uniform material properties throughout the component, maintaining consistent corrosion resistance and thermal conductivity without the weaknesses of glass bonding interfaces.
3Ease of manufacture
If conventional bonding methods are used, then assembly is achieved, but bond lines create non-homogenous material properties
Solution Approach 1:
The patent merges the bonding function with the structural material itself. The consumable silicon core becomes part of the reaction bonding process, and its reaction products integrate seamlessly with the preform pieces. This eliminates the distinct bond line interface and creates a unified, homogeneous structure where the bonding region has the same material properties as the bulk component.
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 approach allows for the production of ceramic components with ultra-small channels that are free of glue beads, ensuring enhanced flow behavior and maintaining homogenous material properties throughout the part.
Implementation Method 1
silicon in the shape of internal features is used within a preform, melted, and infiltrated to create open channels
Implementation Method 2
silicon in the shape of internal features is used within a preform, melted, and infiltrated to create open channels
Implementation Method 3
the core is removed (i.e., consumed) during the process by melting or other means
Implementation Method 4
heat treated; during this heat treatment the Si melts
Data Source
AI summary
A method of producing reaction bonded ceramic components containing internal features is described. In some embodiments, methods as described herein may utilize a preform containing a silicon consumable core that is melted during processing.