Dynamic Bonding of Dissimilar Alloy Powders via Shock Wave Compaction
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Solution Overview
Problem
Current powder metallurgy techniques for aerospace components, such as gas turbine engine disks, face challenges in bonding dissimilar materials with varying mechanical properties across different temperature zones, leading to inefficiencies and impurities due to lengthy processes like hot isostatic pressing.
Innovation Solution
Dynamic compaction process that applies extremely high pressure through shock waves, using explosive charges or high-velocity projectiles, to consolidate alloy powders without melting or chemical reactions, allowing for the bonding of dissimilar materials at ambient temperatures with reduced production time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot isostatic pressing is used to consolidate powder and join disk portions, then the materials can be bonded together, but impurities are exacerbated by lengthy time at elevated temperature and pressure
Solution Approach 1:
The patent changes the bonding parameters from static hot isostatic pressing to dynamic impact loading. The dynamic bonding process applies extremely high pressure (100,000 to 1,000,000 psi) for a very short duration (microseconds to milliseconds), transforming the bonding mechanism from thermal-diffusion based to shock-wave based. This parameter change prevents impurity exacerbation while achieving reliable bonding.
Solution Approach 2:
The dynamic bonding process rushes through the bonding operation extremely quickly, applying shock waves that penetrate and bond materials in microseconds to milliseconds. This rapid process skips the lengthy elevated temperature exposure that would otherwise exacerbate impurities, achieving bonding before contamination can occur.
2Ease of manufacture
If traditional powder metallurgy techniques are used to produce finished products, then components can be manufactured, but production time and costs increase due to multiple steps requiring large presses and expensive hot-pressing dies
Solution Approach 1:
The patent replaces the traditional mechanical hot-pressing system with a dynamic impact system. Instead of using large presses and expensive hot-pressing dies for consolidation and bonding, the process uses explosive charges or drop weights to generate shock waves that perform both consolidation and bonding in a single operation, dramatically reducing equipment requirements and production time.
Solution Approach 2:
The dynamic bonding process merges multiple traditional powder metallurgy steps (pressing, pre-sintering, consolidation, bonding) into a single integrated operation. The shock wave simultaneously consolidates the powder compact and bonds dissimilar materials, eliminating the need for separate hot-pressing and bonding steps, thus reducing production time and equipment costs.
3Ease of manufacture
If a single alloy is used for the entire disk, then manufacturing is simplified, but the mechanical properties cannot satisfy different requirements at hub and rim areas under extreme temperature gradients
Solution Approach 1:
The patent applies local quality by bonding dissimilar alloys at specific locations within the disk. The hub portion uses a alloy optimized for high burst strength and fatigue resistance under high stress, while the rim portion uses an alloy optimized for fatigue crack growth resistance and creep resistance at high temperature. The dynamic bonding process enables this spatial variation in material composition while maintaining manufacturing feasibility.
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
Enables the creation of hybrid powder metallurgy parts with optimized mechanical properties across different regions, reducing production time and costs by preserving the original microstructure and avoiding impurities, thus enhancing the performance and efficiency of aerospace components.
Implementation Method 1
Dynamic compaction process that applies extremely high pressure through shock waves, using explosive charges or high-velocity projects
Data Source
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AI summary
A dynamic compaction process comprising providing a container (22; 116) having a non-cylindrical shape; filling said container (22; 116) with a first powder material (18; 110, 114); sealing the container (22; 116) and dynamically compacting said first powder material (18; 110, 114).