Ln-Al-Fe-O Thermal Barrier Coating for RF Absorption
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Solution Overview
Problem
Current thermal barrier coatings for aircraft engine components require additional layers for RF absorption, increasing weight and manufacturing complexity, while existing coatings are not stable at high temperature conditions.
Innovation Solution
Development of a dual-function thermal barrier and RF absorber coating composition based on the Lanthanide-Aluminum-Iron-Oxygen (Ln—Al—Fe—O) system, which can be applied as a single layer, providing both thermal insulation and RF absorption capabilities, with magnetic activity and strain tolerance up to 1000°C, matching the thermal expansion coefficient of turbine blades and having thermal conductivity similar to yttria stabilized zirconia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermal barrier coating is applied to aircraft engine components, then the components can operate at higher temperatures with improved efficiency, but additional layers are required for RF absorption which increases weight and manufacturing complexity
Solution Approach 1:
The patent combines thermal barrier coating and RF absorber functions into a single dual-function coating layer. The coating contains magnetic particles (such as ferrite or magnetite) dispersed within a thermal barrier matrix material, allowing one layer to simultaneously provide thermal insulation and radio frequency absorption capabilities, thereby eliminating the need for separate coating layers and reducing overall system complexity
Solution Approach 2:
The coating is designed to perform multiple functions simultaneously: it serves as both a thermal barrier to protect engine components from high temperatures and an RF absorber to prevent radar detection. This multi-functional design allows a single coating layer to replace what would traditionally require two separate layers, reducing weight and manufacturing steps while maintaining both protective functions
2Object-affected harmful factors
If additional layers are added for RF absorption, then RF absorption capability is improved, but the weight of the aircraft increases
Solution Approach 1:
The patent merges the RF absorber layer and thermal barrier coating into a single integrated layer containing magnetic particles dispersed in a thermal barrier matrix. This consolidation eliminates the need for a separate RF absorber layer, thereby reducing the total weight of coatings on aircraft engine components while maintaining effective RF absorption capabilities through the magnetic particles embedded within the single layer
3Temperature
If traditional thermal barrier coatings are used, then thermal insulation is provided, but the coatings are not stable at higher temperature conditions
Solution Approach 1:
The patent employs a composite material structure consisting of magnetic particles (ferrite or magnetite) dispersed within a thermal barrier matrix material. This composite approach allows the coating to maintain the thermal insulation properties of the matrix material while the magnetic particles provide RF absorption capabilities. The composite structure is designed to remain stable at high temperatures, with both the matrix and magnetic particles selected to withstand the thermal conditions of aircraft engine operation
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 dual-function coating reduces the weight of aircraft engine components by eliminating the need for additional layers, enhances strain tolerance, and maintains performance comparable to yttria stabilized zirconia at high temperatures, while providing effective RF absorption.
Implementation Method 1
The compositions can serve the dual function of a thermal barrier and an RF absorber... having magnetic activity, such as paramagnetic, ferromagnetic, or ferromagnetic, at temperatures in the range of about 800° C.-1,000° C.
Implementation Method 2
The coating materials are designed to protect the metal underneath from the high temperatures generated during engine operation
Implementation Method 3
The composition may have a thermal expansion coefficient of about 10×10−6/° C. or above... The material may melt congruently so that it may be plasma sprayed in the molten phase and cooled to form the desired phase assemblages
Data Source
AI summary
Embodiments disclosed herein include compositions that serve, among other things, the dual function of a thermal barrier and an RF absorber. The compositions can be applied as a single layer to an aircraft engine component, thus reducing the weight of the aircraft and eliminating an extra coating step in the manufacturing process. The coating materials are designed to protect the metal underneath from the high temperatures generated during engine operation, and also to absorb or scatter radiation which may incumbent on the metal during operation. In some implementations, the compositions comprise a two phase mixture of perovskite and magnetoplumbite.