Tilted Segmented Plating for Gas Turbine Wear and Thermal Stress
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Solution Overview
Problem
Machine components in gas turbines experience undesirable wear and thermal stress due to contact and thermal expansion, limiting their stability and processing flexibility, especially when plated with harder materials that are more brittle.
Innovation Solution
The plating is applied in segments with a tilt angle between the main gas flow direction and the plating elements' longitudinal direction, allowing continuous welding and improved transverse stability, while also guiding cooling air to reduce thermal stress and hot/cold spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plating is made from an application material with greater hardness and/or toughness than the base material, then wear resistance is improved, but the plating becomes more brittle and processing flexibility deteriorates
Solution Approach 1:
The plating is divided into multiple plating segments that are decoupled from one another, allowing the base body to undergo thermal expansion and deformation without causing cracks in the plating. This segmentation enables the hard plating material to maintain its wear resistance while the overall structure retains processing flexibility through the decoupled segments.
2Reliability
If the plating is applied continuously to cover a sufficiently large surface area, then wear protection is improved, but thermal expansion causes cracks and damage in the plating
Solution Approach 1:
The plating is embodied in segments that are decoupled from one another, creating gaps or separations between adjacent plating segments. This segmentation allows the base body to expand thermally without transmitting stress continuously across the entire plating, preventing cracks while maintaining wear protection in each segmented region.
3Stability of the object's composition
If individual zones of plating are embodied as decoupled segments to allow thermal deformation, then plating integrity is improved, but the lateral expansion coverage is reduced
Solution Approach 1:
The plating segments are arranged in a spiral pattern around the base body, following a curved or helical path. This spiral arrangement allows the plating to cover a large lateral surface area while maintaining the decoupled segmented structure that accommodates thermal expansion, effectively combining extensive coverage with structural integrity.
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
This configuration enhances the stability and torsional rigidity of the machine components, reduces processing limitations, and ensures more even cooling air distribution, minimizing thermal stress and wear.
Implementation Method 1
The plating elements are tilted at an angle to the main flow direction of a hot gas flowing through the base body... guiding cooling air to reduce thermal stress and hot/cold spots
Data Source
AI summary
A machine component including a base body produced from a base material is provided. The base body is equipped in a partial region of the surface thereof with a plating made of an application material having a greater hardness and/or viscosity as compared to the base material. The plating is foamed by a number of plating elements that are applied to the base body in the longitudinal direction thereof in a tilted manner relative to the main flow direction of a hot gas flowing through the base body.