Metal Powder Preparation via Hydroxylamine Reduction
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Solution Overview
Problem
Current methods for preparing metal powder, such as the chemical liquid phase reduction method, face challenges with high costs and low yield, and there is a need for improved sintering activity, dispersity, sphericity, and crystallinity, especially in the context of miniaturized electronic components.
Innovation Solution
A method involving the preparation of an ammonia-containing complex metal salt solution and a hydroxylamine compound solution, where the solutions are mixed under controlled conditions, including pH regulation and stirring, to achieve a reduction reaction that produces spherical or nearly spherical metal powder with controlled particle size and dispersity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the chemical liquid phase reduction method is used to prepare metal powder, then the sintering activity and dispersity can be improved, but the production cost increases and yield decreases
Solution Approach 1:
The patent changes the chemical parameters of the reduction process by using hydroxylamine sulfate as the reducing agent and controlling the pH value within 2.5-9.5, with optimal range of 7-9. The molar ratio of metal ion to hydroxylamine is controlled at 1:0.1-10, and temperature at 30-90°C. These parameter optimizations improve both yield and sintering activity simultaneously, resolving the contradiction between manufacturing precision and productivity.
2Manufacturing precision
If the physical atomization method is used to prepare metal powder, then the sphericity can be improved, but the production cost increases and yield decreases
Solution Approach 1:
The patent replaces the mechanical atomization process with a chemical reduction process. Instead of using mechanical energy to atomize metal, the invention uses chemical reactions where hydroxylamine sulfate reduces metal ions to metal powder in solution. This substitution maintains good sphericity through controlled nucleation and growth while dramatically improving yield and reducing cost.
3Manufacturing precision
If the chemical liquid phase reduction method is used to prepare metal powder, then the sintering activity can be improved, but the production cost increases
Solution Approach 1:
The patent uses hydroxylamine sulfate, a relatively inexpensive reducing agent, instead of expensive specialized chemical reducing agents. The method also allows for straightforward disposal or recycling of the aqueous solution, eliminating the need for expensive specialized equipment or complex waste treatment systems. This approach maintains high sintering activity while significantly reducing production cost.
4Manufacturing precision
If higher sintering activity is pursued in metal powder, then the performance of miniaturized electronic components can be improved, but the production complexity increases
Solution Approach 1:
The patent achieves high sintering activity through simple parameter control: pH value (2.5-9.5, optimally 7-9), temperature (30-90°C), and molar ratio of metal ion to hydroxylamine (1:0.1-10). These straightforward parameter adjustments eliminate the need for complex multi-step processes or specialized equipment, making high-performance metal powder production simple and scalable.
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 effectively produces metal powder with enhanced sphericity, crystallinity, and dispersity, reducing production costs and improving yield, while allowing for scalable industrial production with stable product quality and environmental benefits through water recycling.
Implementation Method 1
a reduction reaction to happen under vigorous stirring, and centrifugating after completion of the reaction to obtain metal powder with different particle size
Implementation Method 2
centrifugating after completion of the reaction to obtain metal powder with different particle size
Data Source
AI summary
Provided is a method for preparing metal powder; a metal nitrate or metal sulfate is combined with ammonia water to produce an ammonia-containing complex metal salt solution; the said solution is then quantitatively jet-mixed with the solution containing the hydroxylamine compounds, and reacted under intense stirring; a dispersant solution is added during the reaction process, and after the reaction is complete, the solution is separated by centrifugation to yield the metal power. The method of the present invention can effectively control the reaction rate during the production process, and well control the nucleation rate and dispersity, with the produced metal powder having very good crystallinity, sphericity, tap property and dispersity.