研究目的
To propose acceptance criteria for accelerated aging tests defined by the UNE standard for silvered-glass mirrors in CSP technologies, based on analysis of extensive experimental data.
研究成果
The paper establishes state-of-the-art criteria for initial reflectance and degradation during accelerated aging tests, providing a basis for mirror qualification. It highlights that non-detectable to slight reflectance losses are acceptable under UNE tests, but more aggressive testing is needed for comparative material analysis. An acceleration factor of 26 was estimated for the CASS test in highly corrosive environments, though broader correlations require more outdoor data.
研究不足
The study is limited to silvered-glass mirrors and may not apply to other reflector types. Correlation to outdoor exposure is based on limited data, particularly for low-corrosivity environments. The accelerated tests may not fully replicate all outdoor conditions, and further research is needed for reliable life-span predictions.
1：Experimental Design and Method Selection:
The study involved conducting accelerated aging tests (NSS, CASS, Condensation, TCH, UVH) as per UNE 206016:2018 on silvered-glass mirror samples to assess durability and reflectance degradation. Reflectance measurements were performed before and after testing using spectrophotometry and specular reflectometry.
2：Sample Selection and Data Sources:
Samples of 10x10 cm2 size were cut from full-size facets from six commercial manufacturers of 4 mm silvered-glass mirrors, covering nearly the entire market. Samples included originally sealed edges to avoid cut-edge corrosion effects.
3：List of Experimental Equipment and Materials:
Equipment included salt spray chambers (V?tsch VSC-KWT Series, Erichsen Modell 608), climatic chambers (Ineltec Model CKEST-300, Atlas SC340, Atlas UVTest?), spectrophotometer (Perkin-Elmer Lambda 1050), specular reflectometer (Devices & Services 15R-USB), microscopes (ZEISS Axio CSM 700, Hitachi S 3400 N SEM), and camera (Nikon D300S). Materials included silvered-glass mirror samples and protective adhesive tape for some tests.
4：Experimental Procedures and Operational Workflow:
Samples were subjected to accelerated aging tests for durations beyond UNE recommendations. Reflectance was measured pre- and post-testing using standardized methods. Corrosion, blistering, and other degradations were analyzed visually and with imaging tools.
5：Data Analysis Methods:
Reflectance losses were calculated, and degradation parameters (e.g., corroded area, spot density) were quantified. Statistical analysis involved averaging measurements and comparing against state-of-art benchmarks. Software like Matlab? was used for image analysis.
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Spectrophotometer
Lambda 1050
Perkin-Elmer
Used to measure spectral hemispherical reflectance in the range 280-2500 nm with an integrating sphere.
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Light microscope
Axio CSM 700
ZEISS
Used for imaging degradation spots and analyzing surface features of mirror samples.
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Scanning electron microscope
S 3400 N
Hitachi
Used for detailed imaging of mirror layers and corrosion effects at microscopic levels.
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Salt spray chamber
VSC-KWT Series
V?tsch
Used for conducting CASS and NSS accelerated aging tests by spraying salt solutions to simulate corrosive environments.
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Salt spray chamber
Modell 608
Erichsen
Used for NSS tests to avoid contamination from CASS solution, providing controlled salt spray conditions.
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Climatic chamber
Model CKEST-300
Ineltec
Used for Condensation tests to simulate high humidity conditions with condensation on samples.
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Weathering chamber
SC340
Atlas
Used for Thermal Cycling and Humidity (TCH) tests to simulate temperature and humidity cycles.
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UV test chamber
UVTest?
Atlas
Used for UV and Humidity (UVH) tests to simulate UV exposure and high humidity conditions.
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Specular reflectometer
15R-USB
Devices & Services
Used to measure monochromatic near-specular reflectance at specific angles and wavelengths.
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SLR camera
D300S
Nikon
Used for photographic analysis of sample degradation and documentation.
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