Metal Powder Production via Electric Arc Atomization
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Solution Overview
Problem
Current methods for producing metal powders for additive manufacturing fail to consistently meet quality criteria such as sphericity, particle size distribution, and chemical stability, particularly as they often result in nanometre-sized particles that are not suitable for additive manufacturing.
Innovation Solution
A method involving melting and spraying metal materials using an electric arc, followed by cooling with a carrier gas to form spherical particles, and enriching them with active substances during the cooling process to control chemical composition and size distribution, while using a gas buffer to prevent particle aggregation and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a two-step method with thermal spraying and gas atomisation is used, then metal powders can be produced, but the particles become nanometre-sized which is too small for additive manufacturing
Solution Approach 1:
The invention changes the physical parameters of the atomisation process by using a liquid jet instead of gas, and by controlling the temperature of the liquid jet to be below the melting point of the metal. This parameter change transforms the atomisation mechanism to produce micrometre-sized particles suitable for additive manufacturing rather than nanometre-sized particles
Solution Approach 2:
The invention replaces the gas-based atomisation system with a liquid-based atomisation system. The liquid jet, which can be water or another cooling liquid, substitutes for the gas stream used in conventional atomisation, fundamentally changing the particle formation mechanism and size distribution
2Productivity
If conventional atomisation methods are used, then metal powders can be produced, but the particles exhibit poor sphericity and inconsistent size distribution
Solution Approach 1:
By controlling the liquid jet temperature to be below the melting point and adjusting the jet velocity and diameter, the invention achieves optimal particle sphericity and size distribution. The parameters of the liquid jet (temperature, velocity, diameter) are precisely controlled to produce consistent micrometre-sized spherical particles
Solution Approach 2:
The invention implements feedback control by monitoring particle size and sphericity characteristics and adjusting the liquid jet parameters accordingly. This ensures consistent production of particles meeting the specified size range (5-150 μm) and sphericity requirements for additive manufacturing
3Temperature
If rapid cooling is applied to form particles, then solidification occurs quickly, but particle aggregation and satellite formation increase
Solution Approach 1:
The liquid jet acts as an intermediary medium that provides controlled cooling while preventing particle aggregation. The liquid surrounds each molten droplet during atomisation, ensuring uniform heat extraction and solidification that prevents satellite formation and aggregation, unlike conventional gas atomisation which causes rapid uncontrolled cooling
4Manufacturing precision
If high quality powder is produced for additive manufacturing, then complex geometry parts can be manufactured, but the production process becomes more complex
Solution Approach 1:
The invention merges the atomisation and cooling functions into a single integrated liquid jet system. The liquid jet simultaneously atomises the molten metal and provides controlled cooling, eliminating the need for separate gas atomisation and cooling systems, thereby reducing device complexity while maintaining high powder quality
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 method produces metal powders with high sphericity and reproducible particle size distribution, ensuring the chemical composition is stable and meeting the quality requirements for additive manufacturing, thereby enabling the production of high-quality metal parts with complex geometries.
Implementation Method 1
a step of melting the first and second materials, by means of an electric arc
Implementation Method 2
melting the first and second materials, by means of an electric arc
Implementation Method 3
a step of cooling the droplets by means of a carrier gas so as to form solid particles
Implementation Method 4
The droplets assume a spherical shape by virtue of the surface tension on the surface of the molten metal
Implementation Method 5
The carrier gas, carrying the droplets and particles, limits interactions of the forming particles with other particles, other droplets or the walls of the manufacturing device
Data Source
AI summary
A method of manufacturing powder from a first and a second materials for use in additive manufacturing, the manufacturing process including melting the first and second materials by an electric arc; spraying the melted materials so as to form droplets; cooling the droplets by a carrier gas so as to form solid particles; separating the solid particles from the carrier gas and collecting the solid particles so as to form the powder; and enriching the droplets and/or the particles by means of an active substance.