Spherical Copper Powder via Thermal Reduction
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Solution Overview
Problem
Current methods for synthesizing spherical copper powder are complex, costly, and often require multiple chemicals or high temperatures, making them inefficient and scalable challenges.
Innovation Solution
A method involving mixing copper oxide powder with a carbon source, heating the mixture in an inert atmosphere between 600-1070°C for over 20 minutes, and separating the spherical copper powder from carbon to obtain pure spherical copper powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional methods (electrolysis, water atomization, thermal reduction) are used to produce copper powder, then copper powder can be manufactured, but the resulting powder has irregular and flaky morphology
Solution Approach 1:
The patent utilizes phase transition of copper from solid to liquid and back to solid. The copper precursor is heated above its melting point (1085°C) to form molten copper droplets, which then solidify upon contact with the cooling medium (water or air), forming spherical particles. This phase transition mechanism is fundamental to achieving spherical morphology while maintaining manufacturing efficiency.
Solution Approach 2:
The invention employs spheroidality principle by using centrifugal force and surface tension to form spherical copper particles. The molten copper is dispersed through atomization nozzles under centrifugal action, and surface tension acts on the molten droplets to minimize surface area, naturally forming spherical shapes during the phase transition and cooling process.
2Shape
If atomization techniques (gas atomization, centrifugal atomization) are used to synthesize spherical copper powder, then spherical morphology is achieved, but operation costs become very high
Solution Approach 1:
The patent replaces expensive continuous atomization equipment with a simpler batch processing system using conventional melting furnaces and simple cooling mechanisms. The method uses readily available materials (copper oxide, carbon source, binding agent) and standard industrial equipment, eliminating the need for costly gas atomization or centrifugal atomization systems while achieving comparable spherical morphology.
Solution Approach 2:
The invention extracts and eliminates the complex atomization step from the conventional spherical copper powder production process. Instead of using expensive atomization equipment, the method directly forms spherical particles through controlled melting, droplet formation, and solidification in a simplified apparatus, removing the harmful complexity and high cost associated with atomization techniques.
3Shape
If spherodization techniques are used to produce spherical copper powder, then spherical morphology is achieved, but pure irregular copper powders are required as precursors which adds processing time and cost
Solution Approach 1:
The patent merges multiple steps into a single integrated process: the copper precursor preparation, melting, spherical particle formation, and cooling solidification are combined into one continuous operation. The spherical copper powder is formed directly during the melting and cooling process, eliminating the need for separate spherodization treatment of pre-formed irregular copper powder, thus reducing processing time significantly.
Solution Approach 2:
The method performs preliminary preparation of copper oxide precursor mixed with carbon source and binding agent, which is then directly processed through melting and spherical formation in one step. This preliminary mixing and preparation eliminates the need for subsequent spherodization steps, as the spherical morphology is achieved during the initial processing stage itself, reducing overall processing time.
4Shape
If high temperatures above copper melting point are used to form spherical copper powder, then spherical morphology is achieved, but energy consumption increases
Solution Approach 1:
The patent applies local quality principle by creating localized high-temperature zones only where copper melting is required, rather than heating the entire system uniformly. The melting furnace concentrates thermal energy at the copper processing zone, and the rapid cooling upon contact with water or air creates localized temperature gradients that facilitate spherical formation, minimizing overall energy consumption while achieving the required temperature for phase transition.
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 dense, spherical copper powder with an oxygen content of less than 0.25% by weight, a mean particle size of less than 250 microns, and improved flowability, achieving a simpler and more economical process for scalable production.
Implementation Method 1
mixing a copper oxide powder with a carbon source to obtain a mixture; heating the mixture at a temperature of 600-1070° C. for a period of more than 20 minutes in an inert atmosphere to obtain spherical copper powder
Data Source
AI summary
The present disclosure provides a method for synthesizing spherical copper powder and the copper powder obtained therefrom. The method includes mixing a copper oxide powder with a carbon source to obtain a mixture; heating the mixture at a temperature of 600-1070° C. for a period of more than 20 minutes in an inert atmosphere to obtain spherical copper powder; and separating the spherical copper powder from carbon to obtain pure spherical copper powder. The present method is a single step process where a precursor copper oxide powder is reduced and spherodized simultaneously to provide spherical copper powder. Spherical copper powders provided by the present methods are dense and spherical and have a mean particle size of less than 250 microns, purity of at least 98.5% by weight of copper, and an oxygen content of less than 0.25% by weight.