Polymer Spherical Powder Preparation via Plasma Spheroidization
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Solution Overview
Problem
Current methods for preparing polymer powders for selective laser sintering (SLS) face challenges such as poor powder mixing, complex operations, low production efficiency, and environmental concerns due to high solvent consumption, which affect the quality and scalability of polymer-based spherical powders.
Innovation Solution
A polymer-based spherical powder preparation device combining a mill milling system and an inductively coupled plasma powder spheroidization system, which includes a mill milling system with temperature adjustment and a plasma spheroidization system using high-frequency power and gas flow control, enables continuous production of spherical powders with high sphericity and flowability, avoiding the use of solvents and minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cryogenic pulverization method is used, then the operation is simple, but the powder mixing effect and powder form are poor
Solution Approach 1:
The preparation process is divided into two distinct stages: cryogenic pulverization to break particles, followed by inductively coupled plasma spheroidization to improve form and mixing. This segmentation allows each stage to optimize for its specific function, achieving both simple operation and high powder quality.
Solution Approach 2:
The patent replaces purely mechanical cryogenic pulverization with a combination of mechanical pulverization and plasma field treatment. The inductively coupled plasma system uses electromagnetic fields to heat and reshape particles, substituting mechanical forces with thermal and electromagnetic effects to achieve superior sphericity and mixing.
2Manufacturing precision
If the solvent precipitation method is used, then the powder is uniform in size and mixing, but the operation is complicated and the production efficiency is low
Solution Approach 1:
The patent replaces the chemical solvent precipitation process with inductively coupled plasma spheroidization. The plasma field directly heats and reshapes particles into uniform spheres without requiring solvents, filtration, or drying steps, thereby maintaining powder uniformity while dramatically improving production efficiency.
Solution Approach 2:
The inductively coupled plasma system utilizes phase transitions of the polymer material - heating particles to melting point and then rapid cooling - to achieve spherical shaping. This phase transition approach creates uniform particles directly, eliminating the need for solvent-based precipitation and post-processing.
3Productivity
If the spray drying method is used, then the production efficiency is high, but the consumption of organic solvents is high which may pollute the environment
Solution Approach 1:
The patent replaces the spray drying process that relies on organic solvents with inductively coupled plasma spheroidization using electromagnetic fields and inert gas atmosphere. This substitution eliminates organic solvent consumption entirely while maintaining high production efficiency through continuous plasma processing.
Solution Approach 2:
The inductively coupled plasma system operates in an inert gas atmosphere (typically argon or nitrogen), replacing the organic solvent environment of spray drying. This inert atmosphere prevents pollution while enabling efficient particle heating and shaping, and the gas can be easily vented or recirculated without environmental harm.
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 device achieves high production efficiency, producing polymer-based spherical powders with 97% sphericity, narrow particle size distribution, and improved flowability, suitable for large-scale SLS applications, while maintaining the chemical properties of the original polymers and ensuring a clean, environmentally friendly process.
Implementation Method 1
an inductively coupled plasma generator, a cooling and shaping chamber
Implementation Method 2
inductively coupled plasma powder spheroidization system
Implementation Method 3
a cooling and shaping chamber, a gas supply device
Data Source
AI summary
A polymer-based spherical powder preparation device and preparation process are disclosed. The preparation device comprises a mill milling system and an inductively coupled plasma powder spheroidization system. The mill milling system of the preparation device can achieve ultra-fine grinding of the material at room temperature by applying strong extrusion, shear and circumferential stress to the material; and the inductively coupled plasma powder spheroidization system using high temperature plasma as high temperature heat source, the polymer powder can be heated uniformly, and the melting and cooling rate is fast, so the spheroidization can be completed in a short time. The preparation process of polymer based spherical powder was integrated and continuously produced by the preparation device.