Induction Heating for CMC Melt Infiltration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current melt infiltration methods for ceramic matrix composite (CMC) components in gas turbine engines face challenges due to limited heating capabilities of conventional resistive heating, leading to slow production rates and degradation of heating system components.
Innovation Solution
An induction heating system is employed to heat CMC components and melt infiltrants at varying rates, with a first heating rate faster than 50° C./minute and a second rate slower than the first, allowing for rapid infiltration and densification while preventing self-propagating exothermal reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional resistive heating methods are used for melt infiltration, then the heating system can process CMC components, but the heating rate is limited and production cycle time is excessive
Solution Approach 1:
The patent replaces conventional resistive heating (electrical/thermal system) with induction heating (electromagnetic system). The induction heating system uses electromagnetic fields to directly heat the susceptor and infiltrant, achieving heating rates greater than 50°C/minute compared to the limited heating rates of conventional methods, thereby significantly reducing production cycle time while maintaining process capability for CMC component melt infiltration
Solution Approach 2:
The patent changes the fundamental heating parameter from resistive heating rate to induction heating rate. By using electromagnetic induction, the system achieves heating rates exceeding 50°C/minute, which is a substantial parameter improvement over conventional methods. This parameter change directly addresses the contradiction by enabling faster heating without sacrificing the ability to properly infiltrate CMC components
2Reliability
If conventional resistive heating systems operate at extended temperatures, then melt infiltration can be achieved, but heating elements and insulation degrade rapidly
Solution Approach 1:
The patent replaces the conventional heating system (with vulnerable heating elements and insulation) with an induction heating system. The induction heating system uses electromagnetic fields to heat a susceptor, eliminating direct contact between heating elements and the high-temperature environment. This substitution protects against chemical attacks and thermal degradation, extending system reliability and component lifespan
Solution Approach 2:
The patent introduces a susceptor as an intermediary between the induction heating system and the infiltrant. The susceptor absorbs electromagnetic energy and transfers heat to the infiltrant and CMC component, acting as a protective mediator that prevents direct exposure of heating system components to harsh chemical environments, thereby reducing degradation and extending lifespan
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 significantly reduces cycle times for melt infiltrating CMC components, enhancing production efficiency and extending the lifespan of heating system components by using a controlled induction heating process.
Implementation Method 1
heating, via the induction heating system, the component and a melt infiltrant at a first heating rate within a working chamber of the induction heating system
Implementation Method 2
an induction heating system is employed to heat CMC components and melt infiltrants
Data Source
AI summary
A system and method of melt infiltrating components is provided. In one example aspect, an inductive heating system includes a heating source that inductively heats a susceptor. The susceptor defines a working chamber in which components can be received. During melt infiltration, the system can heat the susceptor and thus the components and melt infiltrants disposed within the working chamber at a first heating rate. The first heating rate can be faster than 50° C./minute. The system can then heat the components and melt infiltrants at a second heating rate. The first heating rate is faster than the second heating rate. Thereafter, the system can heat the components and infiltrants at a third heating rate. The third heating rate can be a constant rate at or above the melting point of the melt infiltrants. The infiltrants can melt and thus infiltrate into the component to densify the component.