Gas Atomization Satellite Reduction Apparatus
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Solution Overview
Problem
Current gas atomization methods for producing metal powders used in additive manufacturing face challenges in reducing or eliminating small satellite particles, which lead to porosity and poor flowability issues in the powders, limiting the quality and yield of metallic powders for high-temperature applications.
Innovation Solution
The development of a system-agnostic methodology using simulation modeling to identify critical regions for satellite formation in gas atomization systems, combined with passive and active interventions such as gas halos, Coanda devices, and filters to suppress satellite recirculation and attachment, optimizing the design and process controls to enhance powder quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas atomization is used to produce metal powders, then productivity and cost-effectiveness are improved, but satellite particles form causing porosity and poor flowability
Solution Approach 1:
The patent extracts and removes satellite particles from the powder stream using classification devices such as vibratory screens and air classification systems. This separates the harmful satellite particles from the desired powder while maintaining high production rates, thus resolving the contradiction between productivity and powder quality.
Solution Approach 2:
The patent introduces intermediary devices between the atomization chamber and the final powder collection point. These intermediaries (classification screens, air separation systems) act as mediators that filter out satellites without affecting the main powder production process, allowing both high productivity and high quality to coexist.
2Manufacturing precision
If satellite particles are reduced through post-processing, then powder quality is improved, but productivity decreases due to additional processing steps
Solution Approach 1:
The patent performs satellite removal as a preliminary action during or immediately after the atomization process itself, rather than as a separate post-processing step. By integrating classification screens and air separation directly into the powder collection system, satellites are removed in-line, maintaining productivity while improving quality.
Solution Approach 2:
The patent merges the satellite removal function with the existing powder collection and conveying system. Instead of adding separate post-processing equipment, the classification and separation functions are combined with the powder handling infrastructure already in place, thus improving quality without significantly reducing productivity.
3Manufacturing precision
If process parameters are optimized to prevent satellite formation, then powder quality is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality improvements by modifying specific regions of the atomization system rather than overhauling the entire process. For example, adjusting gas flow patterns in the atomization chamber or adding localized shielding in specific areas where satellites form, rather than changing global process parameters, thus improving quality with minimal added complexity.
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
This approach effectively reduces satellite formation, improving powder flowability and packing density, leading to higher quality powders with reduced porosity, suitable for additive manufacturing and hot isostatic pressing applications.
Implementation Method 1
Coanda devices
Data Source
AI summary
The broad applicability of at least certain aspects of the present invention derives from the ability to determine the critical location where secondary satellite formation occurs for any atomization system or design and allows for the rapid assessment of the effectiveness of various satellite reduction strategies, including but not limited to several embodiments detailed herein. Aspects of this invention can be utilized during initial atomization system design in order to evaluate effective chamber geometries and enabling strategies which reduce/eliminate satelliting, or can be retrofit to existing systems and allows for economic evaluation of effectiveness based off of initial capital expenditures versus increased operating requirements/expenses.