Oxide-Dispersion-Strengthened Refractory Alloys for Extreme Heat
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Solution Overview
Problem
Existing materials for high temperature structural applications, such as hypersonic aircraft leading edges, face challenges in maintaining structural integrity under extreme heat and thermal gradients, necessitating improved durability and strength.
Innovation Solution
Development of oxide dispersion strengthened refractory-based alloys with in-situ precipitated rare earth refractory oxides, formed through mechanical alloying and consolidation, which create discrete particles within a refractory-based alloy matrix to enhance strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional materials (nickel-based superalloys, single-crystal materials) are used to withstand high temperatures, then temperature resistance is improved, but structural integrity and durability under extreme heat and thermal gradients deteriorate
Solution Approach 1:
The patent creates a composite material system consisting of a refractory-based alloy matrix (continuous phase) combined with in-situ precipitated rare earth refractory oxide particles. This composite structure leverages the high temperature stability of the refractory matrix while the dispersed oxide particles provide strengthening and stabilization effects, achieving both high temperature resistance and maintained structural integrity under thermal gradients.
Solution Approach 2:
The patent introduces localized reinforcement by precipitating rare earth refractory oxide particles specifically within the refractory-based alloy matrix. These discrete particles (0.1-5 volume%) are distributed throughout the continuous phase, creating local regions of enhanced strength and thermal stability where needed most, without compromising the overall material's ability to withstand thermal gradients.
2Temperature
If refractory metals are used for higher temperature applications, then temperature resistance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent modifies the composition parameters of the refractory-based alloy by incorporating specific rare earth elements (such as yttrium, lanthanum, cerium) that form stable oxide precipitates. By controlling the volume fraction (0.1-5 volume%) and distribution of these oxide particles through mechanical alloying and consolidation processes, the material achieves enhanced high-temperature performance without requiring complex multi-layer composite construction or expensive rare earth metal combinations.
3Temperature
If cooling technologies are implemented to protect leading edges, then temperature management is improved, but device complexity and weight increase
Solution Approach 1:
The patent provides a inherently thermally stable material solution that eliminates the need for complex active cooling systems. By developing a refractory-based alloy with in-situ precipitated rare earth oxide particles that maintains structural integrity at extreme temperatures, the material itself becomes the protective mechanism, replacing expensive and complex active cooling technologies with a passive, inherently stable material property.
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 alloys exhibit increased strength and durability, reducing mechanical stresses and maintaining structural integrity under high temperatures and thermal gradients, potentially replacing costly composites with a cost-effective solution.
Implementation Method 1
consolidating reacts the dissolved rare earth oxide with at least one of the at least two refractory elements to precipitate dispersed discrete particles therein
Implementation Method 2
mechanically alloying the physical powder mixture to form an alloyed mixture having the rare earth oxide at least partially dissolved therein
Data Source
AI summary
Methods of forming an oxide dispersion strengthened refractory-based alloy are provided. The oxide dispersion strengthened refractory-based alloy may include a refractory-based alloy comprising two or more refractory elements and forming a continuous phase; and a rare earth refractory oxide comprising at least one rare earth element and at least one of the two or more refractory elements. The rare earth refractory oxide forms discrete particles within the continuous phase, and the oxide dispersion strengthened refractory-based alloy comprises 0.1 volume % to 5 volume % of the rare earth refractory oxide.