Reactive Metal Powder In-Flight Heat Treatment for Flowability
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Solution Overview
Problem
Reactive metal powders with poor flowability form agglomerates, leading to issues such as pipe clogging, difficulty in sieving, and increased safety risks due to static electricity sensitivity, which are detrimental for applications like 3D printing and coatings.
Innovation Solution
An in-flight heat treatment process involving reactive metal powders and additive gases to improve flowability, achieving particle size distributions with flowability less than 40 or 30 seconds as measured by ASTM B213, and minimizing electronegative atom/molecule content to less than 1000 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If reactive metal powder is produced by conventional atomization, then the powder can be manufactured, but it exhibits poor flowability and forms agglomerates
Solution Approach 1:
The patent applies in-flight heat treatment to change the physical and chemical parameters of the powder particles during atomization. By controlling temperature, residence time, and atmospheric composition in the atomization chamber, the powder surface properties are modified to reduce interparticle attraction and improve flowability while preventing agglomeration.
Solution Approach 2:
The patent uses an inert or controlled atmosphere in the atomization chamber to prevent unwanted oxidation and chemical reactions during powder formation. This controlled environment allows for better flowability by preventing surface oxidation that would increase particle adhesion and agglomeration tendency.
2Productivity
If fine reactive metal powder is produced, then the powder is useful for 3D printing and coatings, but it has higher surface area leading to higher reactivity and safety risks
Solution Approach 1:
The patent maintains an inert atmosphere throughout the atomization and handling process to suppress the high reactivity of fine powder particles. This prevents spontaneous combustion and unsafe reactions while preserving the fine particle size needed for 3D printing and coatings applications.
Solution Approach 2:
The in-flight heat treatment modifies the surface chemistry and physical state of the particles, creating a surface layer or modification that reduces reactivity while maintaining the desired fine particle size distribution for advanced manufacturing applications.
3Ease of manufacture
If reactive metal powder with poor flowability is produced, then manufacturing can proceed, but it causes pipe clogging and sticking on atomization chamber walls
Solution Approach 1:
The patent uses in-flight heat treatment to change the surface properties and temperature of particles during atomization, improving flowability and preventing adhesion to chamber walls and pipes. This ensures smooth powder flow through the system without clogging or sticking issues.
Solution Approach 2:
The patent employs controlled gas flows and pneumatic transport systems to maintain particle suspension and movement through the atomization chamber and collection system, preventing settling and adhesion that would cause clogging and wall sticking.
4Ease of manufacture
If reactive metal powder in agglomerate form is produced, then powder can be manufactured, but it is difficult to sieve and separate into size distributions
Solution Approach 1:
The in-flight heat treatment modifies particle properties during atomization to prevent agglomerate formation, producing free-flowing individual particles that can be easily sieved and separated into precise size distributions for different applications.
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 flowability, reduces static electricity sensitivity, and prevents agglomeration, allowing for uniform powder distribution and safer handling, suitable for applications like powder metallurgy and coatings.
Implementation Method 1
contacting said reactive metal powder with at least one additive gas while carrying out said 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.