Induction Heated Ceramic Tube for Ultrafine Metal Powder
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Solution Overview
Problem
Existing methods for manufacturing ultrafine metal powders, such as mechanical crushing and gas atomization, face challenges like angular particle shapes, uneven size distributions, and low yields of powders less than 20 μm. Additionally, high-melting point metals pose issues with uneven melting during the Electrode Induction Gas Atomization (EIGA) process.
Innovation Solution
The proposed ultrafine powder manufacturing system includes a ceramic or quartz tube with a fine nozzle, an induction heater for melting the metal, and a gas injection unit to produce ultrafine powders. This system also features a metal electrode supply device that rotates the metal electrode to prevent uneven melting, allowing for continuous production of ultrafine powders with high yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical crushing method is used to manufacture metal powder, then the manufacturing process is simple, but the powder has angular shape and uneven particle-size distribution which is not suitable for 3D printing
Solution Approach 1:
The patent replaces mechanical crushing with gas atomization process, where molten metal is sprayed through a nozzle and atomized by gas flow to produce spherical particles. This substitution of mechanical processing with gas-phase processing resolves the contradiction by achieving both manufacturing feasibility and particle uniformity.
Solution Approach 2:
The patent utilizes phase transition of metal from solid (raw material) to liquid (molten state) and then to solid (spherical powder particles) through controlled cooling. This phase transition process enables the formation of uniform spherical particles suitable for 3D printing while maintaining manufacturing efficiency.
2Manufacturing precision
If EIGA (Electrode Induction Gas Atomization) method is used to manufacture high-purity spherical powder, then the powder quality is high, but uneven melting occurs as the diameter of the metal electrode increases, making powder manufacturing impossible
Solution Approach 1:
The patent introduces rotation of the metal electrode during the atomization process. This dynamic motion ensures uniform heat distribution across the electrode surface, preventing localized melting and short circuits that occur with stationary electrodes. The rotation enables processing of larger diameter electrodes while maintaining powder quality.
Solution Approach 2:
The patent applies vibration to the metal electrode during atomization. This vibration prevents adhesion between the electrode and induction coil, ensures uniform melting, and prevents short circuits. The vibrational effect enables stable operation with high-melting-point metals and larger electrode diameters.
3Manufacturing precision
If gas atomization is used to manufacture ultrafine powder of 20 μm or less, then the powder size is fine, but the ultrafine power yield is very low (less than 20 μm)
Solution Approach 1:
The patent optimizes multiple parameters including nozzle diameter, gas flow rate, metal feed rate, and electrode rotation speed to maximize ultrafine powder yield. By carefully controlling these parameters, the system achieves high yield of 20 μm or less powder 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 system achieves high yields of ultrafine powders with diameters of 20 μm or less, effectively addressing the limitations of existing methods. It also enables the continuous production of high-melting point and reactive metal powders, improving productivity and reducing manufacturing costs.
Implementation Method 1
an induction heater that wraps around the outside of the tube and melts a metal raw material supplied into the tube
Implementation Method 2
an induction heater that wraps around the outside of the tube and melts a metal raw material supplied into the tube
Implementation Method 3
injecting the gas into the melt flowing from the nozzle to manufacture ultrafine powder with a high yield
Data Source
AI summary
An ultrafine powder manufacturing system is described. The system comprises a tube made of ceramic or quartz and a fine nozzle integrally formed in the lower part of the tube, wraps the outside of the tube with an induction heater to melt a metal raw material supplied into the tube and cause it to flow through the nozzle, and supplies a spray gas through orifices arranged to surround the nozzle in a state spaced apart from the nozzle to spray the gas onto the flowing melt to manufacture ultrafine powder.