In-Flight Heat Treatment of Reactive Metal Powders for Flowability
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Solution Overview
Problem
Reactive metal powders often exhibit poor flowability due to static electricity sensitivity, leading to agglomeration, pipe clogging, and difficulty in sieving, which is detrimental for applications like 3D printing and coatings.
Innovation Solution
An in-flight heat treatment process involving reactive metal powders is conducted with at least one additive gas to improve flowability, achieving particle size distributions with flowabilities less than 40 or 30 seconds as measured by ASTM B213, and controlling the content of electronegative atoms and molecules to less than 1000 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reactive metal powder is produced by conventional atomization, then particle size distribution is achieved, but flowability deteriorates due to static electricity sensitivity
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the powder surface through controlled oxidation during atomization. By adjusting oxygen potential and temperature parameters, a thin oxide layer is formed that reduces static electricity sensitivity and improves flowability while maintaining the desired particle size distribution.
Solution Approach 2:
The patent uses accelerated oxidation by introducing controlled amounts of oxygen or oxidizing gases during the atomization process. This creates a thin oxide layer on the powder particles that reduces static charge accumulation and improves flow characteristics without significantly affecting particle size.
2Manufacturing precision
If reactive metal powder is produced by conventional atomization, then particle size distribution is achieved, but agglomeration occurs due to poor flowability
Solution Approach 1:
The patent modifies surface chemical parameters by controlling oxidation during atomization, creating a thin oxide layer that reduces interparticle attraction forces and prevents agglomeration while preserving the intended particle size distribution.
Solution Approach 2:
The patent converts the harmful effect of reactive metal surfaces (which cause agglomeration) into a beneficial effect by controlled oxidation. The oxide layer that would normally be considered a contaminant actually serves to reduce static electricity and prevent agglomeration, improving powder stability.
3Productivity
If reactive metal powder is produced by conventional atomization, then production efficiency is maintained, but handling difficulty increases due to poor flowability
Solution Approach 1:
The patent changes the surface chemical parameters during atomization by controlling oxidation, which improves handling characteristics such as flowability and spreadability without requiring additional processing steps, thus maintaining production efficiency.
4Manufacturing precision
If reactive metal powder is produced by conventional atomization, then particle size distribution is achieved, but sieving difficulty increases due to agglomerates
Solution Approach 1:
The patent modifies surface chemical parameters through controlled oxidation during atomization, creating a thin oxide layer that prevents agglomerate formation and enables easier sieving while maintaining the desired particle size distribution.
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 process enhances the flowability of reactive metal powders, reducing static electricity sensitivity and improving their handling and application in processes such as powder metallurgy and coatings without adding foreign particles.
Implementation Method 1
contacting said reactive metal powder with at least one additive gas while carrying out said in-flight heat treatment process
Implementation Method 2
in-flight heat treatment process
Data Source
AI summary
There are provided reactive metal powder in-flight heat treatment processes. For example, such processes comprise providing a reactive metal powder; and contacting the reactive metal powder with at least one additive gas while carrying out said in-flight heat treatment process, thereby obtaining a raw reactive metal powder.