Two-Phase Oxide Dielectric Absorber for High-Temperature Radiation
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Solution Overview
Problem
Conventional dielectric absorbers using ferromagnetic materials lose effectiveness at temperatures above the Curie temperature, making it difficult to achieve uniform electromagnetic radiation absorption across a broad temperature range, especially in high-temperature applications like aviation, where components can exceed 1100°C.
Innovation Solution
A two-phase oxide dielectric absorber composed of lanthanum oxide, strontium oxide, and cobalt oxide with perovskite and potassium nickel fluoride crystalline structures, which maintains chemical compatibility and absorption efficiency from 700°C to 1100°C by combining two single-phase materials with different temperature-dependent properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single material dielectric absorber is used, then the absorber is simple in structure and easy to manufacture, but it becomes ineffective at temperatures exceeding its effective absorption range (above Curie temperature for ferromagnetic materials)
Solution Approach 1:
The patent employs a composite dielectric absorber consisting of multiple materials with complementary temperature-dependent electromagnetic absorption properties. This composite structure enables the absorber to maintain effectiveness across a broad temperature range by combining materials that operate effectively at different temperature regimes, thereby resolving the contradiction between reliability at specific temperatures and adaptability across wide temperature ranges.
Solution Approach 2:
The dielectric absorber is segmented into multiple functional components, each optimized for specific temperature ranges. This segmentation allows different material phases or compositional regions to operate independently within their optimal temperature windows, ensuring continuous absorption effectiveness as temperature varies, thus addressing the limitation of single-material absorbers.
2Reliability
If ferromagnetic materials are used in dielectric absorbers, then electromagnetic radiation absorption is effective at lower temperatures, but the material loses its ferromagnetic ability above the Curie temperature
Solution Approach 1:
The patent utilizes changes in material parameters, specifically the Curie temperatures of different ferromagnetic materials, to extend the overall operating temperature range. By selecting materials with progressively higher Curie temperatures and combining them in a composite structure, the absorber maintains ferromagnetic properties and absorption effectiveness across a broader temperature spectrum, overcoming the limitation of individual materials losing magnetization above their respective Curie points.
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 two-phase oxide dielectric absorber provides uniform and effective electromagnetic radiation absorption across a wider temperature range, ensuring consistent performance in high-temperature applications by leveraging the coexistence of two chemically compatible atomic arrangements.
Implementation Method 1
A wide temperature range dielectric absorber... provides uniform and effective electromagnetic radiation absorption across a wider temperature range
Data Source
AI summary
According to one exemplary embodiment, a wide temperature range dielectric absorber includes a dielectric absorber comprising a blend of lanthanum oxide, strontium oxide, and cobalt oxide, and is represented by (1−z)[La1−xSrxCoO3±y]+z[La2−xSrxCoO4±y]. The dielectric absorber includes a first crystalline structure existing independently from a second crystalline structure causing the dielectric absorption composition to have a wide temperature range of electromagnetic radiation absorption. In one embodiment, the first crystalline structure is a perovskite crystalline structure and the second crystalline structure is a potassium nickel fluoride crystalline structure.