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US 12,687,476 B2Granted
Method for characterizing a coating
AssigneeMTU Aero Engines AG
InventorsFlorian Beck, Steven Piorun, Sascha Buettner, Manuel Hertter, Christoph Rau
Life of this patent
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Abstract
The present invention relates to a method for characterizing a coating, in which method a mass and/or a volume of a basic body is/are measured prior to coating; a mass and a volume of the basic body with the applied coating are measured; for characterizing the coating, a density of the coating is determined from the volume and mass measurements; wherein the volume is optically measured.
Claims7
A method for assessing quality of a thermally sprayed run-in lining coating on a housing of a turbomachine, comprising the steps of:
- providing a housing component having a surface;
- measuring a mass and optically measuring a volume of the housing component using a projector and two cameras in a three dimensional structured-light projection measurement system;
- prior to optically measuring, treating the surface of the housing component to reduce reflections by spraying chalk on the surface, applying titanium dioxide to the surface, matting of the surface by vibratory grinding or matting by tumbling;
- thereafter, thermally spraying a run-in coating on the housing component;
- the run-in coating having a surface roughness with roughness peaks;
- defining a density of the run-in coating from layer parameters in advance;
- thereafter, measuring a mass and optically measuring a volume of the same housing component with the applied run-in coating thereon;
- thereafter, determining a difference in the mass and volume before and after coating of the housing component,
- thereafter, determining a density of the run-in coating from the difference in the mass and volume before and after coating of the housing component;
- detecting damage or monitoring quality of the run-in coating by way of a deviation from the density defined in advance;
- wherein the housing component is securely held in a holder before and after the coating;
- monitoring quality of the run-in coating from the deviation of the density thereof before and after coating of the housing component;
- automatically recording data of the layer parameters;
- evaluating the recorded data within a framework of a statistical process control;
- wherein the surface roughness of the coating is smoothed by software post-processing to fill in valleys between the roughness peaks so it can be compared to a mechanical measurement of the coating;
- mechanically measuring the housing component with calipers applied only to the roughness peaks of the surface of the housing component;
- and
- comparing the software post-processing with the mechanical measuring of the housing component with calipers.
15 more elements
Dependencies are inferred from the claim text.