Microsampling Intact Surface Deposits From Multi-Layered Materials
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for assessing the integrity of multi-layered structures, such as fuel cladding in nuclear reactors, are costly and invasive, requiring removal and shipment of large samples for analysis, with only a small portion being characterized, while shutting down operations for sampling is not feasible in many cases.
Innovation Solution
A minimally invasive micro-sampling method that uses specialized cutting tools like micro-diamond wire saws, micro-focus lasers, and wire electrical discharge machines to extract a small, intact sample from the surface of multi-layered materials, preserving the surface deposits and coating layers, which can then be shipped for microstructural characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large samples are removed for analysis, then sufficient material is available for comprehensive testing, but the cost and operational disruption increase significantly
Solution Approach 1:
The patent extracts only the necessary microsample (≤2mm diameter) containing the multi-layered structure and surface deposits, rather than removing large portions of the component. This extraction approach provides sufficient material for microstructural characterization while minimizing operational disruption and maintaining component integrity.
Solution Approach 2:
The sampling process is segmented into precise micro-cutting operations that isolate a small representative portion of the multi-layered structure. This segmentation allows comprehensive analysis of coatings, interlayers, and substrate interfaces within a minimal sample size, eliminating the need for large-scale removal.
2Quantity of substance
If large samples are removed and shipped for analysis, then comprehensive testing can be performed, but the cost increases to over one million dollars
Solution Approach 1:
The method extracts a microsample small enough to be analyzed at routine facilities rather than requiring specialized hot cell facilities. This extraction to minimal necessary size eliminates expensive shipping and handling requirements, reducing costs from over one million dollars to significantly lower amounts.
Solution Approach 2:
The microsampling approach uses a disposable microsample that is too small to require expensive specialized handling facilities. The sample can be analyzed at routine metallurgical laboratories, eliminating the need for costly specialized infrastructure and services.
3Reliability
If the entire fuel rod is removed for characterization, then complete assessment of cladding integrity is possible, but operational continuity is severely disrupted
Solution Approach 1:
The patent extracts a microsample containing the complete multi-layered cladding structure with surface deposits intact, providing sufficient material for comprehensive integrity assessment. This extraction allows complete metallurgical analysis including coating thickness, interface quality, and deposit characterization without removing the entire fuel rod.
Solution Approach 2:
The method uses partial action by removing only the minimal necessary portion of cladding for analysis. The microsample provides excessive information for integrity assessment relative to its small size, enabling complete characterization while maintaining reactor operational continuity.
4Ease of operation
If minimally invasive micro-sampling is used, then operational disruption and cost are reduced, but the sample must be small enough to maintain structural integrity
Solution Approach 1:
The micro-cutting tool is designed with local quality features including a depth-limiting element that prevents penetration through the cladding wall. This localized control ensures the sample remains within safe depth parameters while maintaining minimal invasiveness and operational ease.
Solution Approach 2:
The sampling process controls the depth parameter through mechanical constraints on the micro-cutting tool. By changing the depth parameter from full-wall penetration to partial-depth sampling, the method achieves minimal invasiveness while maintaining sufficient material for analysis.
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 method significantly reduces the cost and disruption associated with sampling by allowing for the extraction of very small, intact samples that can be analyzed at a lower cost, improving sampling statistics and maintaining the integrity of the structure during the sampling process.
Implementation Method 1
micro-diamond wire saw
Implementation Method 2
micro-focus laser
Implementation Method 3
wire electrical discharge machine
Data Source
AI summary
A method of sampling a multi-layered material and a micro-sampling tool are described. The sampling method includes penetrating a top surface of a material in a component of interest with a micro-cutting tool to a predetermined depth sufficient to include each layer of the multi-layered material and a portion of the base, without cutting through the full depth of the base, under-cutting from the depth of penetration through the base to define a micro-sample of the multi-layered material, and removing the micro-sample with each layer of the multi-layered material intact. The micro-sampler includes a cutting tool calibrated to cut to a depth no greater than 2 mm, and in some aspects, no greater than 200 microns into a multi-layered material, the material having a top surface and a metallic or ceramic base and a container for removing and storing a micro-sample cut from the material with each layer of the multi-layered material and a portion of the base intact.