Cross-Flow Gas Separation of Contaminated Alloy Powders
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Solution Overview
Problem
Contaminants in alloy powders, such as nickel-based superalloys, lead to defects in final products like gas turbine engine disks, causing early cracks due to their presence.
Innovation Solution
A method involving a cross-flow stream of gas is applied to a stream of mixed powders to displace particles of different densities, forming separate streams based on density differences, using nozzles and inert gases like argon to achieve separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional separation methods are used to remove contaminants from alloy powders, then the purity of the powder is improved, but the process complexity and cost increase
Solution Approach 1:
The invention uses a gas flow (pneumatic) system to separate powder particles based on density differences. A cross-flow of gas is applied perpendicular to the powder stream, causing lighter contaminant particles to be carried further by the gas flow while heavier alloy powder particles remain closer to the original stream path, achieving separation without complex mechanical devices
Solution Approach 2:
The invention changes the physical parameter of gas flow velocity and direction to achieve separation. By controlling the cross-flow gas velocity and applying it at specific angles to the powder stream, particles are separated based on their density characteristics, transforming a complex mechanical separation problem into a controllable fluid dynamics process
2Difficulty of detecting and measuring
If manual inspection methods are used to detect contaminants in powder, then the detection capability is improved, but the productivity decreases
Solution Approach 1:
The invention replaces manual inspection (mechanical/human process) with an automated pneumatic separation system. The gas flow automatically separates contaminants from alloy powder based on density differences, enabling continuous high-speed processing without manual intervention while maintaining effective contaminant removal
Solution Approach 2:
The separation system uses the inherent density difference between contaminants and alloy powder particles to achieve automatic separation. The cross-flow gas naturally carries lighter particles away from the heavier alloy powder stream without requiring external control mechanisms, enabling the system to self-regulate and maintain separation effectiveness
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
Effectively separates contaminants like silica and alumina from superalloy powders by exploiting density differences, ensuring higher-density superalloy powders are collected separately, reducing defects in final products.
Implementation Method 1
powders of different density are displaced by the cross-flow stream to a different extent, thereby forming separate streams of powders having different density
Data Source
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AI summary
A method for gas flow separation of powders (18, 20) includes establishing a stream of mixed powders (10); and applying a cross-flow stream of gas (16) to the stream of mixed powders (10) such that powders (18, 20) of different density are displaced by the cross-flow stream (16) to a different extent, thereby forming separate streams of powders (18, 20) having different density. An apparatus is also disclosed.