Abrasive Blade Tip Additive Layer Prevents Seal Debris Clogging
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Solution Overview
Problem
Abrasive tips in turbomachines experience clogging due to the buildup of carbonized rub debris from abradable seals, which leads to frictional heating and failure of the polyurethane erosion-resistant coating.
Innovation Solution
An additive coating comprising solid lubricants like zinc stearate, calcium stearate, hexagonal boron nitride, magnesium stearate, lithium fluoride, or molydisulfide is applied to the abrasive blade tips to prevent adhesion of organic components from the abradable seal, thereby preventing clogging and frictional heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an abrasive tip is used to rub against an abradable seal, then the seal is protected from damage and clearance is maintained, but carbonized portions of the seal adhere to the abrasive tip and cause frictional heating
Solution Approach 1:
A coating layer is applied to the abrasive tip surface to act as an intermediary between the abrasive grit particles and the abradable seal. This coating prevents direct adhesion of carbonized seal material to the abrasive tip while allowing the abrasive function to continue, thereby eliminating the source of frictional heating without compromising seal protection
Solution Approach 2:
The surface properties of the abrasive tip are modified by applying a coating with different adhesion characteristics. This changes the surface energy and chemical composition parameters of the tip, making it resistant to carbonized material adhesion while maintaining the mechanical abrasion capability against the seal
2Quantity of substance
If carbonized portions build up between grit particles, then adhesion of seal material occurs, but frictional heating increases causing failure of the polyurethane coating
Solution Approach 1:
The coating on the abrasive tip serves as a mediator that prevents carbonized seal material from building up between the grit particles. By blocking the adhesion interface, the coating eliminates the mechanism that would otherwise lead to increased frictional heating and subsequent polyurethane coating failure
Solution Approach 2:
The coating is applied in advance to the abrasive tip surface to create a protective barrier before any carbonized material buildup can occur. This pre-established protective layer prevents the adhesion and accumulation process from starting, thereby cushioning against the eventual frictional heating that would damage the polyurethane coating
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 additive coating effectively prevents the adhesion of organic components from the abradable seal to the abrasive tip, reducing frictional heating and maintaining the integrity of the polyurethane coating, thus enhancing the operational lifespan of the turbomachine components.
Implementation Method 1
An additive coating comprising solid lubricants like zinc stearate, calcium stearate, hexagonal boron nitride, magnesium stearate, lithium fluoride, or molydisulfide is applied to the abrasive blade tips to prevent adhesion of organic components from the abradable seal
Data Source
AI summary
An abrasive tip comprises an additive layer having an additive; the additive is configured to prevent adhesion of an organic component from an abradable seal onto an abrasive blade tip.