Coated Support for Material Compatibility Analysis
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Solution Overview
Problem
Existing methods for analyzing materials' compatibility with cultural goods, such as the Oddy test, face issues with reproducibility and surface damage of pure metal indicators, and vapor-deposited metal layers are susceptible to corrosion.
Innovation Solution
A method involving carriers coated with sputtered silver, copper, and lead layers, stored in a sealed environment with additives like distilled water and activated carbon, where changes in the metal layers are analyzed over time to assess material suitability, using techniques like optical analysis, X-ray diffractometry, and UV/Vis spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pure metal platelets or foils are used as indicators, then the analysis can be performed with simple materials, but the indicators must be manually cut, cleaned, and mounted which degrades the surface and metal structure, impairing reliability and reproducibility
Solution Approach 1:
The indicator is segmented into two functional parts: a support structure (carrier) that provides mechanical stability and a metal layer (silver, copper, or lead) that performs the corrosion detection function. This segmentation allows the carrier to be pre-prepared with consistent properties while the metal layer can be uniformly deposited, eliminating manual handling damage and improving reproducibility.
Solution Approach 2:
A support structure acts as an intermediary between the metal layer and the external environment. This carrier (made from materials like glass, plastic, or metal) protects the metal layer during handling and mounting, preventing surface degradation while allowing the metal layer to remain intact and reliable for corrosion analysis.
2Ease of manufacture
If thermal vapor deposition is used to produce indicators, then metal layers can be deposited onto substrate surfaces, but the resulting layers have open-pored structure that makes them susceptible to corrosion even in air
Solution Approach 1:
The deposition process parameters are changed from thermal vapor deposition to sputtering. This parameter change transforms the metal layer structure from open-pored to dense and compact, fundamentally altering the corrosion resistance properties while maintaining the ability to deposit metal layers onto substrate surfaces.
Solution Approach 2:
The thermal vapor deposition process is replaced with a sputtering process. This substitution changes the physical mechanism of deposition from thermal evaporation to physical sputtering, resulting in denser metal layers with superior corrosion resistance while retaining the functionality of metal layer formation on carriers.
3Ease of manufacture
If conventional metal indicators are used in the Oddy test, then the test can be performed with traditional materials, but impurities in the pure metals compromise the quality of the analytical method
Solution Approach 1:
The metal layer is preliminarily prepared with high purity through controlled sputtering deposition onto the carrier before the actual corrosion test. This preliminary action ensures that the metal layer starts with minimal impurities, establishing a baseline of high purity that maintains measurement precision throughout the analytical process.
Solution Approach 2:
Instead of using bulk pure metal materials that contain inherent impurities, a thin metal layer is created as a copy or representation of pure metal through controlled deposition. This copied metal layer can be produced with superior purity control while maintaining the chemical properties needed for corrosion 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 approach enhances reproducibility and reduces corrosion susceptibility, allowing for accurate classification of materials as suitable, temporarily suitable, or unsuitable for storage with cultural goods, with clearer differentiation between corroded and non-corroded metal layers.
Implementation Method 1
the at least one support is coated by sputtering with silver and/or copper and/or lead
Implementation Method 2
the corrosion behavior of the indicators is visually determined
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4
AI summary
The invention relates to a method for producing a substrate coated with at least one metal layer, namely a silver layer, a copper layer and/or a lead layer, and to a method for analyzing materials that can be carried out therewith.