Ceramic Composite Bond Interfaces with Localized Joule Sintering
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Solution Overview
Problem
Ceramic composite components used in high-temperature applications, such as aerospace, are susceptible to oxidation and delamination, leading to deterioration of physio-mechanical properties, and existing high-temperature heating methods are inefficient and may damage substrates.
Innovation Solution
The development of high-temperature coatings and interfaces for ceramic composite substrates using pre-sintered ceramic layers that are sintered using localized joule heating, which allows for rapid and efficient bonding without exposing the underlying substrate to extreme temperatures, utilizing contact or non-contact heating elements to achieve temperatures above 1000°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional high-temperature heating methods are used to sinter ceramic interfaces, then the sintering temperature can be achieved, but the underlying substrate may be damaged and energy consumption increases
Solution Approach 1:
The patent applies localized Joule heating to specifically heat the pre-sintered ceramic interface layer between substrates without heating the entire substrate. This localized approach allows the interface to reach sintering temperature while the substrate remains at lower temperatures, avoiding substrate damage. The heating is concentrated where needed - at the interface layer - rather than throughout the entire component.
Solution Approach 2:
The patent segments the heating function by separating the heating of the interface layer from the heating of the substrate. By applying electrical current directly to the interface layer containing conductive particles, the heating action is divided and targeted specifically at the interface region, allowing independent temperature control of the interface versus the substrate.
2Strength
If conventional heating methods are used to sinter ceramic interfaces, then bonding can be achieved, but energy consumption increases and thermal stress is generated
Solution Approach 1:
The patent replaces conventional thermal heating systems with Joule heating (electrical heating). By passing electrical current through conductive particles in the interface layer, heat is generated directly at the bonding interface through resistive heating. This substitution of heating mechanism reduces energy loss and allows more efficient heating of the interface without requiring large thermal masses to be heated.
Solution Approach 2:
The patent changes the heating parameter from external thermal conduction to internal Joule heating. By incorporating conductive particles (such as metal or carbon particles) into the pre-sintered interface layer, the interface becomes electrically conductive, enabling direct electrical heating. This parameter change allows precise control of heating location and reduces overall energy consumption.
3Reliability
If high-temperature coatings are applied to protect ceramic substrates from oxidation, then protection is achieved, but the coating process becomes complex and time-consuming
Solution Approach 1:
The patent creates a composite interface layer that combines ceramic particles with conductive particles (metal or carbon). This composite structure serves multiple functions: the ceramic particles provide high-temperature stability and oxidation resistance, while the conductive particles enable Joule heating for rapid sintering. By integrating these functions into a single composite layer, the need for separate protective coatings is reduced.
Solution Approach 2:
The patent uses pre-sintered ceramic layers as the starting material for the interface. These pre-sintered layers are prepared in advance with the appropriate ceramic particle composition and structure, providing oxidation resistance before the final sintering process. This preliminary preparation reduces the complexity of the main sintering process and ensures protective properties are already in place.
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 effectively protects ceramic composite substrates from oxidation and delamination, maintains substrate integrity, and enables the formation of durable high-temperature coatings and interfaces on large or complex substrates with reduced energy consumption and thermal stress.
Implementation Method 1
sintering at least a portion of the pre-sintered ceramic interface by heating the portion of the pre-sintered ceramic interface to a sintering temperature of the ceramic interface using joule heating
Data Source
AI summary
An article for a high temperature environment includes a first ceramic composite substrate, a second ceramic composite substrate, and a high temperature interface between a first surface of the first ceramic composite substrate and a second surface of the second ceramic composite substrate. The high temperature interface includes at least one high temperature interface layer that includes a ceramic matrix and a plurality of fibers distributed through the ceramic matrix.