Lightning Protection Coating for High-Temperature Structures
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Solution Overview
Problem
Existing lightning protection solutions for non-conductive structures in high temperature environments, such as those found in space launchers and aircraft engines, face challenges due to low temperature resistance, complexity in implementation, and difficulty in repair, particularly when dealing with structures having complex geometries.
Innovation Solution
A lightning protection device comprising a first conductive paint layer and a second thermally insulating and electrically conductive coating, which provides effective discharge of lightning current and maintains integrity under high heat fluxes, adaptable to complex geometries, with thermal conductivity less than 0.1 W.m^-1.K^-1 and surface resistivity less than 200 ohms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal fabrics or conductive coatings are applied to protect against lightning, then electrical conductivity is improved, but temperature resistance deteriorates
Solution Approach 1:
The patent applies a composite coating system consisting of two distinct layers: a conductive layer (metal fabric, mesh, or conductive paint) for lightning protection and a ceramic insulating layer for thermal protection. This composite structure combines materials with complementary properties to simultaneously achieve electrical conductivity and high temperature resistance, resolving the contradiction between these two requirements.
2Reliability
If protective coatings are applied to structures with complex geometry, then lightning protection is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent employs flexible metal fabrics and meshes that can be conformally wrapped around and adhered to complex geometric surfaces. These flexible conductive elements can adapt to irregular shapes and complex geometries, ensuring complete coverage while simplifying the manufacturing process compared to rigid coating methods.
3Reliability
If conductive layers are deposited on surfaces, then electrical conductivity is improved, but ease of repair deteriorates
Solution Approach 1:
The protective system is segmented into two independent functional layers: a conductive layer for electrical protection and a ceramic insulating layer for thermal protection. This segmentation allows the conductive layer to be independently repaired or replaced without affecting the thermal protection layer, significantly improving ease of repair compared to integrated coating systems.
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 solution effectively protects against lightning strikes in high temperature environments by ensuring electrical continuity and thermal insulation, allowing for easy adaptation to complex structures and facilitating repair.
Implementation Method 1
the use of a conductive paint capable of quickly discharging a large amount of current during a lightning strike
Implementation Method 2
thanks to the presence of a second thermally insulating coating, the integrity of the protection device of the invention is preserved even when it is used on structures exposed to high heat fluxes
Data Source
Figure 1~2B
Figure 2C~2E
AI summary
The invention relates to a lightning protection device (200) intended to be fitted to a structure (100) that is to be protected, and comprising: a first coating comprising at least one coat of conducting paint (202), a second coating (204) placed on the surface coating and containing a thermally insulating and electrically conducting material.