Diffuser Bore Boride Layer Erosion Resistance
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Solution Overview
Problem
Centrifugal compressor diffusers in gas turbine engines face erosion issues due to high-speed abrasive particles, leading to efficiency loss and potential surging, as the bore surfaces are difficult to protect from erosion damage.
Innovation Solution
A diffuser ring with boride layers on its bore surfaces is introduced, formed through boronizing the stainless steel substrate to enhance erosion resistance, providing a hardened surface that protects against abrasive particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional diffuser bore surfaces are used, then manufacturing is simpler, but erosion resistance is poor due to high-speed abrasive particles
Solution Approach 1:
The patent applies composite materials by combining a base metal substrate (such as steel or aluminum) with a ceramic coating layer (such as tungsten carbide, titanium carbide, or other hard coatings). This composite structure provides both the structural integrity of the base material and the erosion resistance of the hard coating, directly addressing the contradiction between manufacturing simplicity and erosion resistance.
Solution Approach 2:
The patent changes the surface properties of the diffuser bore by applying hard coatings that alter surface hardness, wear resistance, and friction characteristics. This parameter change enables the surface to withstand high-speed abrasive particles while maintaining the original bulk material properties and manufacturing processes.
2Reliability
If diffuser bore surfaces are hardened to resist erosion, then erosion resistance improves, but surface finish may deteriorate
Solution Approach 1:
The composite structure with a soft base material and hard coating layer allows the surface to be hardened for erosion resistance while the coating application process can maintain or restore surface finish. The base material provides ductility and the coating provides hardness, combining benefits that resolve this contradiction.
Solution Approach 2:
The hard coating is applied to the diffuser bore surface before the component enters service, preliminarily protecting the surface from erosion. This preliminary action prevents surface degradation before it occurs, maintaining both erosion resistance and surface finish throughout the component's operational life.
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 boride layer significantly increases the surface hardness of the diffuser bore surfaces, offering improved dry erosion resistance and maintaining the original surface finish, thus preventing efficiency loss and surging caused by abrasive particles.
Implementation Method 1
boronizing the stainless steel substrate to enhance erosion resistance
Implementation Method 2
formed through boronizing the stainless steel substrate to enhance erosion resistance, providing a hardened surface
Data Source
AI summary
A diffuser for a centrifugal compressor in a gas turbine engine, the diffuser including a diffuser ring having a series of bores defined therethrough to receive and direct air exiting the compressor, each bore being defined by a respective bore surface including a boride layer protecting the bore surface from erosion damage.