Silver Powder Surface Control for Fine Conductive Paste Wiring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods struggle to produce silver powders with desired surface irregularities, making it difficult to form wiring patterns with precise line width and height in conductive pastes, which is essential for thinner wires in electronic components.
Innovation Solution
A method involving disintegration of agglomerated silver powder in an airflow type mill using heated compressed air and classification in a pneumatic classifier, followed by collection, to control particle size and surface roughness, resulting in a silver powder suitable for forming thin and high wiring patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional silver powder production methods are used, then the production process is simple, but the silver particle surfaces cannot achieve desired irregularities
Solution Approach 1:
The patent applies preliminary action by controlling the moisture content of the agglomerated silver powder to a specific range (2-20 wt%) before the disintegration step. This preliminary moisture control enables the compressed air to effectively generate surface irregularities during disintegration, resolving the contradiction between achieving desired surface irregularities and maintaining process simplicity.
Solution Approach 2:
The patent changes key parameters including moisture content (2-20 wt%), compressed air temperature (80-180°C), and exhaust temperature (30-100°C) to achieve the desired surface irregularities. By optimizing these parameters, the patent enables precise control over particle surface morphology without significantly complicating the production process.
2Manufacturing precision
If silver powder with controlled surface irregularities is produced, then wiring patterns with desired line width and height can be formed, but the production process requires additional process steps
Solution Approach 1:
The patent merges the disintegration step with the drying step by using compressed air at 80-180°C to simultaneously disintegrate agglomerated particles and control moisture content. This combined approach achieves desired surface irregularities and wiring pattern precision while minimizing additional process steps and maintaining production efficiency.
Solution Approach 2:
The patent uses pneumatic principles by supplying compressed air through nozzles to disintegrate silver powder agglomerates and control particle morphology. This pneumatic approach enables precise control over surface irregularities and wiring pattern dimensions without requiring complex mechanical processing steps.
3Measurement precision
If the exhaust temperature from the airflow type mill is controlled within 30-100°C, then classification efficiency is improved, but energy loss increases
Solution Approach 1:
The patent optimizes the exhaust temperature parameter to a specific range (30-100°C) that balances classification precision with energy efficiency. By controlling the compressed air temperature (80-180°C) and monitoring exhaust temperature, the patent achieves optimal classification results while minimizing excessive energy loss, resolving the contradiction between measurement precision and energy conservation.
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 method enables the production of a silver powder that can be used to create conductive pastes capable of forming wiring patterns with desired line width and height, addressing the limitations of conventional techniques.
Implementation Method 1
disintegration of agglomerated silver powder in an airflow type mill using heated compressed air
Implementation Method 2
classification in a pneumatic classifier
Data Source
AI summary
Provided is a method of producing a silver powder and the silver powder that enable preparation of a conductive paste capable of forming a wiring pattern with desired line width and height. A method of producing a silver powder comprises: a disintegration step of disintegrating an agglomerated silver powder in an airflow type mill, and a classification step of classifying a silver powder after the disintegration step, in a pneumatic classifier, wherein the agglomerated silver powder has a moisture content of 2 wt % or more and 20 wt % or less, in the disintegration step, compressed air at a temperature of 80° C. or more and 180° C. or less is supplied to the airflow type mill as supply air, in the classification step, an exhaust of the airflow type mill and the silver powder after the disintegration step are supplied to the pneumatic classifier.