YSZ Coating Doping for Component Identification
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Solution Overview
Problem
Current methods for determining the operating time and manufacturer of YSZ-coated components in gas turbines are inadequate, leading to uncertainties in component reconditioning and increased risk of misjudgment due to lack of information on process parameters and material quality.
Innovation Solution
Doping the YSZ heat insulation layer with metal oxides to create a visibly distinguishable doped region, allowing for comparison of lattice parameter changes to determine operating time using a calibrating characteristic curve, and optionally using metal oxides like hematite for visible marking or IR/UV/X-ray detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard YSZ coating methods are used, then the heat insulation layer can be applied to component surfaces, but the manufacturer and process parameters cannot be identified, leading to increased risk of misjudgment
Solution Approach 1:
The patent applies doping with metal oxides (such as chromium oxide, cobalt oxide, nickel oxide) to the YSZ coating, which causes visible color changes in the coated surface. These color variations serve as visual identifiers that encode information about the coating manufacturer, process parameters, and material composition, thereby preventing information loss and enabling reliable component state assessment.
2Measurement precision
If YSZ coating is applied without doping, then the coating process is simpler, but the operating time and thermal exposure cannot be determined
Solution Approach 1:
The patent utilizes parameter changes in the form of lattice parameter variations in the YSZ crystal structure caused by metal oxide doping. The doped YSZ exhibits different lattice parameters compared to undoped YSZ, and these parameters change at different rates under thermal exposure. By measuring these lattice parameter changes using X-ray diffraction, the operating time and thermal history of the component can be precisely determined, while the doping itself adds only minimal complexity to the coating composition.
3Duration of action of stationary object
If the same initial YSZ material is used, then material consistency is maintained, but considerable differences arise in useful life due to unknown process parameters
Solution Approach 1:
The patent implements a feedback mechanism by incorporating metal oxide dopants that create measurable signatures in the YSZ coating. These dopants cause characteristic color changes and lattice parameter variations that provide feedback information about the coating's thermal history, manufacturing process, and degradation state. This feedback enables accurate prediction of TBC useful life and informs reconditioning decisions, eliminating the uncertainty caused by unknown process parameters even when the same initial YSZ material is used.
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
Enables reliable identification of the manufacturer and operating time of YSZ-coated components, improving reconditioning processes and reducing misjudgment risks by providing clear, measurable indicators of thermal exposure.
Implementation Method 1
comparing a slower or faster change in lattice parameters of the doped YSZ region, as compared with undoped YSZ, and determining the operating time of the component under temperature by comparing the lattice parameters with a known calibrating characteristic curve
Data Source
AI summary
A method for designating a component, coated with a heat insulation layer including zirconium dioxide (ZrO2) stabilized with yttrium oxide (Y2O3) [YSZ], and for determining its operating time or operating temperature is provided. The method includes doping the heat insulation layer and marking the doped heat insulation layer, with at least one metal oxide in at least one surface region of the component. The metal oxide is selected such that the doped region of YSZ is visible or can be made optically visible in order to designate the component. The method also includes comparing a slower or faster change in lattice parameters of the doped YSZ region, as compared with undoped YSZ, and determining the operating time of the component under temperature by comparing the lattice parameters with a known calibrating characteristic curve.