Single Crystal Grain Structure Seals for Creep Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Advanced technology systems, such as gas turbine engines, face mechanical failure due to creep caused by high temperatures and pressures, which existing components are unable to effectively resist.
Innovation Solution
The development of single crystal grain structure seals with a specific crystalline orientation, formed using precipitation hardened nickel-based super alloys, which are designed to maintain structural integrity and flexibility by controlling the Young's modulus and crystalline direction, allowing for reduced stress and increased resistance to creep.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-grain structure components are used, then manufacturing is easier and cost is lower, but resistance to creep under high temperature and pressure is insufficient
Solution Approach 1:
The patent changes the fundamental parameter of grain structure from multi-grain to single-crystal, eliminating grain boundaries that are susceptible to creep damage. This parameter change fundamentally improves resistance to creep under high temperature and pressure environments while maintaining component functionality.
Solution Approach 2:
The patent employs precipitation-hardened nickel-based superalloys with specific compositional ranges (e.g., 5-15% chromium, 3-8% cobalt, 0.5-3% molybdenum) to create a composite material system that achieves both high-temperature strength and creep resistance through controlled precipitation of strengthening phases within the single-crystal matrix.
2Reliability
If single crystal grain structure is used, then resistance to creep is improved, but manufacturing complexity and difficulty increase
Solution Approach 1:
The patent incorporates preliminary action by embedding a seed crystal with the desired crystallographic orientation before the casting process. This seed crystal guides the directional solidification to grow the single-crystal structure in the intended orientation, simplifying the overall manufacturing process and ensuring consistent grain structure properties.
Solution Approach 2:
The patent applies local quality by creating a controlled temperature gradient during directional solidification, where the cooling rate and thermal conditions are locally optimized to promote single-crystal growth in specific regions while maintaining the desired grain structure orientation throughout the component.
3Reliability
If single crystal grain structure with controlled orientation is used, then resistance to wear and oxidation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates feedback mechanisms through real-time monitoring of temperature gradients and solidification rates during the directional solidification process. This feedback control ensures that the single-crystal grain structure develops with the precise crystalline orientation required for optimal resistance to wear and oxidation, while maintaining manufacturing precision.
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 single crystal grain structure seals demonstrate improved resistance to creep, wear, oxidation, and thermal expansion, enabling them to operate effectively within high temperature and pressure environments without mechanical failure, thus extending the operational lifespan of components.
Implementation Method 1
components that operate at high temperatures and pressures while simultaneously resisting the harmful effects of creep
Implementation Method 2
the seal is formed of a precipitation hardened nickel based super alloy
Implementation Method 3
maintain structural integrity and flexibility by controlling the Young's modulus and crystalline direction, allowing for reduced stress
Data Source
AI summary
The present disclosure relates to advanced materials, particularly single crystal grain structures including the formation of single crystal grain structures. Single crystal grain structures offer improved mechanical properties when used with individual components. Improving mechanical properties is favorable for components that are used in applications with high temperature, pressure, and stress. In these applications, mechanical failure is extremely undesirable. Individual components, such as seals, can be designed with a single crystal grain structure in a preferred direction. By selecting a preferred direction, and orienting the single crystal grain structure accordingly, the single crystal grain structure can improve the component's mechanical properties. Single crystal grain structure seals and the method of forming the seals, therefore, offer various improvements to individual components, specifically when the components are designed for high temperature, pressure, and stress applications.