Turbine Blade Tip Repair Using FAST Joining for Longer Service Life
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Solution Overview
Problem
Conventional turbine blade tip repair techniques lack durability and often require frequent replacements, limiting the operational life of gas turbine engines due to issues like tip rubs, oxidation, erosion, and thermal mechanical fatigue.
Innovation Solution
The method involves using Field Assisted Sintering Technology (FAST) to join a ground-down airfoil mating surface with a blade tip body, which can be made of a different metal alloy, ensuring a strong and durable bond with improved cooling passage integration and surface finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional blade tip repair techniques are used, then repair cost is reduced compared to new parts, but durability and service life are significantly reduced
Solution Approach 1:
The patent replaces conventional mechanical repair techniques (welding, bonding, mechanical fastening) with Field Assisted Sintering Technology (FAST), which uses pulsed electric current to generate localized heat and pressure for joining. This substitution achieves metallurgical-grade bonds with superior durability while maintaining repair feasibility, directly resolving the contradiction between improved reliability and manufacturing ease.
Solution Approach 2:
The patent utilizes parameter changes in the FAST process, specifically controlling pulse duration (milliseconds to seconds), current density, and pressure application to achieve optimal bonding conditions. By precisely controlling these parameters, the process achieves durable joints without the complexity of conventional multi-step repair procedures, simultaneously improving reliability and ease of manufacture.
2Duration of action of moving object
If blade tips are repaired multiple times, then operational life is extended, but durability decreases with each repair cycle
Solution Approach 1:
By replacing conventional mechanical repair methods with FAST, the patent achieves repair durability that matches or exceeds original manufacturing quality. This substitution ensures that each repair cycle maintains high reliability, allowing multiple repairs without the degradation seen in traditional methods, thus extending operational life while preserving durability.
Solution Approach 2:
The patent enables recovery of blade tips that would otherwise be discarded after conventional repairs reach their durability limits. The FAST process restores blade tip integrity to near-original conditions, allowing the same component to be repaired and reused multiple times, thereby extending operational life while maintaining reliability.
3Duration of action of stationary object
If blade tips are designed for extended life, then replacement frequency is reduced, but initial manufacturing complexity increases
Solution Approach 1:
The patent segments the blade tip from the main blade structure, allowing the tip to be separately repaired using FAST. This segmentation enables focused repair of only the worn tip portion rather than replacing or complexly repairing the entire blade assembly, achieving extended service life without proportionally increasing manufacturing complexity.
Solution Approach 2:
The FAST process utilizes controlled parameter changes (pulsed current, temperature, pressure) to achieve durable repairs in a single step, avoiding the need for complex multi-stage manufacturing processes. This approach extends blade tip service life while keeping the manufacturing process relatively simple and controllable.
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 approach results in longer-lasting, more durable blade tip repairs, extending the operational life of gas turbine engines by enhancing the structural integrity and wear resistance of the blade tips.
Implementation Method 1
joining the first mating surface to the second mating surface via a Field Assisted Sintering Technology ('FAST') process
Data Source
AI summary
A method of repairing, or manufacturing, a tip for an airfoil can comprise: removing a portion of the airfoil that reduces a radial height of the airfoil and defines a first mating surface of the airfoil; forming a blade tip body for the airfoil, the blade tip body defining a second mating surface; and joining the first mating surface to the second mating surface via a Field Assisted Sintering Technology (“FAST”) process.