Brazed Hardfacing Coating for Turbine Wear and Oxidation
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Solution Overview
Problem
Components in gas turbines, such as bucket interlocks, face challenges due to high temperatures and mechanical contact, leading to wear and oxidation issues that reduce their longevity.
Innovation Solution
A method involving the application of a material coating formed from a combination of hardfacing material, aluminum-containing particles, and a braze material, followed by thermal treatment to generate an aluminum oxide layer that reduces oxidation of the hardfacing material and facilitates binding with the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating is applied to reduce mechanical resistance during operation, then wear resistance is improved, but oxidation resistance deteriorates at high temperatures
Solution Approach 1:
The coating is formulated as a composite material containing hardfacing particles (for wear resistance), aluminum-containing particles (for oxidation resistance), and braze material. This composite structure allows simultaneous achievement of wear resistance through hardfacing particles and oxidation resistance through aluminum-containing particles that form protective oxide layers at high temperatures
Solution Approach 2:
The coating provides different local properties: hardfacing particles are distributed to provide wear resistance in contact zones, while aluminum-containing particles are distributed to provide oxidation resistance in high-temperature zones. The braze material binds these components together, creating a coating with spatially varying functionality tailored to different operational conditions
2Object-affected harmful factors
If thermal treatment is applied to generate oxide layer, then oxidation resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The aluminum-containing particles are pre-incorporated into the coating formulation before application. During subsequent thermal treatment (such as brazing), these particles automatically oxidize to form the protective oxide layer. This preliminary incorporation eliminates the need for separate oxide formation processes and integrates oxidation resistance into the standard coating application and thermal treatment workflow
3Strength
If braze material is added to facilitate binding, then coating adhesion is improved, but coating composition complexity increases
Solution Approach 1:
The braze material is merged with hardfacing particles and aluminum-containing particles into a single composite coating formulation. This unified coating is applied in one step and then thermally treated to simultaneously achieve binding (through braze material), wear resistance (through hardfacing particles), and oxidation resistance (through aluminum-containing particles). This merging eliminates the need for multiple separate coating layers or application steps
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 resulting oxidation and mechanical wear-resistant (OMWR) brazed coating enhances the longevity of gas turbine components by reducing oxidation and wear, thereby extending their service life and reducing operational costs.
Implementation Method 1
thermally treating the material coating at a temperature to generate an oxide layer comprising aluminum from the aluminum-containing particles, wherein the oxide layer is configured to reduce oxidation of the hardfacing material
Implementation Method 2
the braze material is configured to facilitate binding between the material coating and the surface of the machine component
Data Source
AI summary
A method includes applying a material coating to a surface of a machine component, wherein the material coating is formed from a combination of a hardfacing material, aluminum-containing particles, and a braze material. The method also includes thermally treating the material coating at a temperature to generate an oxide layer comprising aluminum from the aluminum-containing particles, wherein the oxide layer is configured to reduce oxidation of the hardfacing material, and the braze material is configured to facilitate binding between the material coating and the surface of the machine component.