Cross-Flow Gas Separation for Contaminated Superalloy 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.
Innovation Solution
A method involving a cross-flow stream of gas is applied to a stream of mixed powders to displace powders of different densities, forming separate streams based on density differences, using nozzles and inert gases like argon to create a jetting speed of 1-100 m/s and a nozzle density of 100-2400 NPI, followed by collection using a moving web apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If contaminants are present in alloy powders, then manufacturing process is simplified, but product quality deteriorates due to defects and early cracks
Solution Approach 1:
The patent extracts contaminants from the alloy powder stream using a cross-flow gas stream that selectively removes lower-density contaminant particles while retaining higher-density alloy powder particles, thereby eliminating the harmful contaminants without affecting the desired product
Solution Approach 2:
The patent introduces a gas stream as an intermediary medium that facilitates separation between contaminants and alloy powder based on density differences, allowing selective removal of contaminants through controlled gas flow across the powder stream
2Reliability
If density-based separation is applied, then contaminant removal effectiveness is improved, but process complexity increases due to additional equipment and parameters
Solution Approach 1:
The patent employs pneumatic principles by using a cross-flow gas stream to separate particles based on density differences, leveraging fluid dynamics to achieve effective separation without complex mechanical equipment
Solution Approach 2:
The patent changes the physical state and flow parameters of the gas stream (velocity, flow rate, direction) to optimize the separation process, allowing effective contaminant removal through controlled adjustment of gas flow parameters rather than complex mechanical systems
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 displacing them differently, ensuring high-purity superalloy collection and potential recycling of contaminants.
Implementation Method 1
applying a cross-flow stream of gas to the stream of mixed powders such that powders of different density are displaced by the cross-flow stream to a different extent, thereby forming separate streams of powders having different density
Implementation Method 2
the nozzle establishes a jetting speed for the mixed powders of between 1 and 100 m/s
Data Source
AI summary
A method for gas flow separation of powders includes establishing a stream of mixed powders; and applying a cross-flow stream of gas to the stream of mixed powders such that powders of different density are displaced by the cross-flow stream to a different extent, thereby forming separate streams of powders having different density. An apparatus is also disclosed.