Laser-Treated Ceramic Solar Coatings for 700°C Durability
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Solution Overview
Problem
Concentrating solar power (CSP) systems require durable solar absorptive coatings that maintain high solar absorptivity and thermal stability at temperatures above 700°C, as existing organic-based coatings like Pyromark®-2500 are not durable enough for long-term operation.
Innovation Solution
Development of laser-treated ceramic oxide coatings, such as chrome oxide (Cr2O3) and lanthanum strontium manganite (LSM), which are applied using thermal spraying and then treated with a pulsed laser source to create nanostructures that enhance solar absorption and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic-based coatings like Pyromark®-2500 are used, then high solar absorptivity is achieved, but durability at high temperatures deteriorates
Solution Approach 1:
The patent changes the material composition parameter from organic-based to ceramic oxide-based (chrome oxide, LSM), which fundamentally alters the thermal stability and durability characteristics while maintaining solar absorptivity through laser-induced nanostructure formation
Solution Approach 2:
The patent creates a composite structure by combining ceramic oxide material with laser-induced nanostructures, resulting in a material that exhibits both high solar absorptivity and enhanced high-temperature durability
2Reliability
If ceramic oxide coatings are used, then durability at high temperature is improved, but solar absorptivity deteriorates
Solution Approach 1:
The patent introduces a new dimensional feature at the nanoscale by creating nanostructures through laser treatment, which adds light-trapping capabilities to the otherwise low-absorptivity ceramic oxide surface, effectively solving the solar absorptivity problem without compromising thermal durability
3Use of energy by moving object
If laser treatment is applied to create nanostructures, then solar absorptivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces complex multi-step mechanical or chemical nanostructure fabrication processes with a simpler laser treatment process, which directly creates the desired nanostructures through controlled material removal or transformation in a single step
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 laser-treated ceramic coatings exhibit solar absorptance figures of merit similar to Pyromark®-2500, demonstrating improved durability and solar absorptivity, making them suitable for high-temperature CSP applications.
Implementation Method 1
treating the coated surface with a pulsed laser source, thereby forming the solar absorptive coating on the surface
Implementation Method 2
These nanostructures are significantly smaller than the wavelength of light in the solar spectrum and could easily scatter photons resulting in improved solar absorption
Implementation Method 3
capable of extended operation in air at temperatures in excess of 700° C., with high absorptivity and low emissivity in the solar spectrum
Data Source
AI summary
The present invention relates to solar absorptive coatings including a ceramic material. In particular, the coatings of the invention are laser-treated to further enhance the solar absorptivity of the material. Methods of making and using such materials are also described.