Fluorescent Penetrant Inspection of Ceramic Matrix Composites
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Solution Overview
Problem
Current nondestructive inspection methods for ceramic matrix composite (CMC) components using fluorescent penetrants face challenges due to excessive bleed back and high noise levels, making it difficult to accurately distinguish between defects and nondefects, especially with the use of developers that agglomerate and reduce sensitivity to small defects.
Innovation Solution
A method that involves applying a fluorescent penetrant to a CMC component, followed by a series of washing and emulsifying steps without using a developer, utilizing a solvent washing agent to remove excess bleed back, allowing for efficient and cost-effective visual inspection under UV light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a developer is applied to the surface of the CMC component to wick and draw up the penetrant containing fluorescent dye, then the penetrant is drawn out of the surface defects by capillary action, but excessive bleed back occurs and noise in the inspection data increases
Solution Approach 1:
The patent removes the developer step entirely from the inspection process. Instead of using a developer to wick and draw up the penetrant, the method relies on direct fluorescent penetrant application and controlled washing steps to remove excess penetrant while retaining it in defects, thereby eliminating the harmful bleed back and noise associated with developer use.
Solution Approach 2:
The patent changes the chemical parameters of the washing process by using controlled washing steps with specific washing solutions that have different properties than traditional developer. This allows for selective removal of excess penetrant while preserving penetrant in defects, achieving the desired contrast without excessive bleed back.
2Measurement precision
If a developer is used in the fluorescent penetrant inspection process, then the penetrant is drawn out of surface defects, but the inspector is challenged to discriminate between defect and nondefect locations due to visual noise
Solution Approach 1:
The patent extracts and eliminates the developer step from the inspection process. By removing the developer, the source of visual noise and bleed back is eliminated, allowing inspectors to clearly distinguish between actual defects and nondefect locations without the interference of excessive fluorescent signal from the developer area.
Solution Approach 2:
The patent converts the harmful effect of excess penetrant on the surface (which causes noise when developer is used) into a benefit by using controlled washing steps that selectively remove surface penetrant while preserving it in defects. This creates a beneficial contrast that enhances defect visibility without the harmful noise.
3Ease of manufacture
If traditional fluorescent penetrant inspection methods are used on CMC components, then inspection can be performed at low cost, but the number of fluorescing locations is high making the surface difficult to accurately inspect
Solution Approach 1:
The patent changes the process parameters by implementing a controlled multi-step washing process with specific washing solutions. This process selectively removes excess penetrant from the CMC surface while retaining penetrant in actual defects, thereby reducing the number of fluorescing locations and improving inspection accuracy while maintaining the low-cost advantage of fluorescent penetrant methods.
Solution Approach 2:
The patent applies different washing treatments to different areas of the component surface. The controlled washing process selectively removes penetrant from nondefect areas while preserving it in defect areas, creating local quality differences that enhance the visibility and accuracy of defect detection without requiring expensive equipment or materials.
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 reduces visual noise, enhances the ability to discriminate between defects and nondefects, and reduces inspection time and costs, enabling more effective nondestructive inspection of CMC components without the need for developers.
Implementation Method 1
a developer, as is part of a standard FPI inspection, is applied to the surface of the component to wick and cause the penetrant containing the fluorescent dye, which was retained in the cracks or surface flaws, to be drawn up out of the surface defects by capillary action
Implementation Method 2
Fluorescent or dye penetrant inspection (FPI) may provide a low cost means for nondestructive inspection
Data Source
AI summary
Systems and methods associated with nondestructive inspection of composite material components using fluorescent penetrants for detecting undesirable defects in such components are described. Ceramic matrix composite components include high porous surfaces making defect detection challenging, including contributing to excessive bleed back during the process. The systems and methods include a solvent washing of the component prior to inspection.