Titanium Oxide Network Coating for Solar Thermal Oxidation Resistance
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Solution Overview
Problem
Existing heat absorber coatings for solar heat power generation face challenges with thermal oxidation resistance and spectral absorptance, particularly at high temperatures, where carbon nanotubes may oxidize and degrade, limiting their practical application.
Innovation Solution
A coating with a network structure of composite particles, comprising metal oxides like Mn, Cr, Cu, Zr, Mo, Fe, and Bi, coated with titanium oxide, and optionally a porous silica coating, is developed to enhance thermal oxidation resistance and spectral absorptance, with a process involving mixing titanium alkoxide with acetylacetone and spraying onto a substrate at controlled temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If carbon nanotubes are added to titanium oxide to improve spectral absorptance, then visible light absorption is enhanced, but thermal oxidation resistance deteriorates at high temperatures
Solution Approach 1:
The patent removes carbon nanotubes from the coating composition to eliminate the thermal oxidation problem. Instead, it uses only titanium oxide and metal oxide particles, extracting the harmful carbon component while preserving the light-absorbing functionality through the titanium oxide material.
Solution Approach 2:
The patent replaces the carbon nanotube-titanium oxide composite with a purely inorganic titanium oxide-based coating that can withstand high temperatures. This substitution uses materials that maintain stability and performance in high-temperature environments where carbon-based materials would degrade.
2Use of energy by moving object
If chromium nitride is used as heat absorber coating, then spectral absorptance is improved, but environmental burden increases
Solution Approach 1:
The patent removes chromium-containing materials from the coating composition to eliminate environmental concerns associated with chromium nitride. It replaces chromium-based compounds with titanium oxide and non-toxic metal oxide particles, extracting the harmful chromium element while maintaining optical performance.
Solution Approach 2:
The patent substitutes environmentally harmful chromium nitride with environmentally friendly titanium oxide and common metal oxide particles. These alternative materials provide comparable or superior spectral absorptance without the toxicological and environmental issues associated with chromium compounds.
3Reliability
If a dense coating structure is used to improve thermal oxidation resistance, then high temperature stability is improved, but spectral absorptance decreases
Solution Approach 1:
The patent creates a coating with non-uniform structure where metal oxide particles are distributed within the titanium oxide matrix. This local variation in composition and structure allows different regions to contribute differently: the titanium oxide provides thermal stability while the metal oxide particles enhance light absorption through scattering and absorption effects.
Solution Approach 2:
The patent uses a composite coating system consisting of titanium oxide as the base material with dispersed metal oxide particles (such as iron oxide, copper oxide, or zinc oxide). This composite structure combines the high-temperature stability of titanium oxide with the enhanced optical properties of metal oxide particles, achieving both thermal oxidation resistance and high spectral absorptance.
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 coating achieves excellent thermal oxidation resistance and high spectral absorptance, maintaining performance even at high temperatures, thus improving the efficiency and durability of solar heat power generation systems.
Implementation Method 1
titanium oxynitride can absorb visible light
Implementation Method 2
efficiently collect heat by further improving the spectral absorptance
Implementation Method 3
carbon can improve visible spectral absorptance and infrared light radiation
Data Source
AI summary
An absorber coating is provided for solar heat power generation that has excellent thermal oxidation resistance and a high spectral absorptance and manufacturing method thereof. The absorber coating for solar heat power generation has a network structure of composite particles comprising: particles of metal oxide containing mainly two or more metals selected from Mn, Cr, Cu, Zr, Mo, Fe, Co and Bi, and titanium oxide partly or entirely coating on the surface of the particle of the metal oxide. The arithmetic mean estimation of the surface of the coating is 1.0 μm or more, and a ratio of a network area of the composite particle to a plane area of the coating is 7 or more.