Particle Size Distribution Analysis in Metal Materials
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Solution Overview
Problem
Conventional methods for analyzing particle size distribution in metal materials are slow, inaccurate, and difficult to reproduce, especially for particles smaller than several micrometers, due to reliance on visual inspection and optical emission spectrometry, which struggles with distinguishing between inclusions and other factors, and cannot accurately quantify the size and number density of fine particles.
Innovation Solution
The method employs field flow fractionation (FFF) to preliminarily fractionate particles by size, using a steel-derived particle extractor and a surfactant-based disperser to stabilize and disperse particles, followed by laser light scattering to determine particle size and number density, enabling accurate and rapid analysis of particle size distribution and composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microscopic inspection methods are used to analyze particle size distribution, then visual observation of particles can be achieved, but the inspection speed is slow and measurement accuracy is poor due to difficulty in discriminating inclusions from misconceptional factors
Solution Approach 1:
The patent extracts particles from the metal material matrix through electrolytic dissolution, isolating them for individual analysis. This extraction allows each particle to be measured separately by light scattering, eliminating the need for visual discrimination and enabling both high accuracy and automated rapid measurement
Solution Approach 2:
The patent replaces the mechanical/visual inspection system with an optical measurement system. Instead of visual observation under microscopes, the system uses light scattering measurements to automatically determine particle size, eliminating human subjectivity and enabling rapid automated measurement with high precision
2Quantity of substance
If optical emission spectrometry is used to determine particle size, then compositional analysis can be performed, but accurate quantification of particle size and number density is not achieved due to inability to distinguish inclusions from other factors
Solution Approach 1:
The patent segments the analysis process into two independent measurements: light scattering for particle size and light absorption for composition. By measuring particle size through light scattering before compositional analysis, the system can accurately quantify both size and number density without confusion from compositional variations
Solution Approach 2:
The patent introduces light scattering as an intermediary measurement method to determine particle size. This intermediary optical measurement provides accurate size information that can be combined with compositional data, enabling precise quantification of particle number density and size distribution
3Reliability
If electrolytic extraction followed by microscopic analysis is used to increase particle number, then representative particle size distribution data can be obtained, but a large number of photographing and image processing operations are required making inspection slow
Solution Approach 1:
The patent implements automated measurement where the system performs all measurements and calculations without manual intervention. The light scattering measurement automatically provides particle size, and the system automatically calculates number density and distribution, eliminating the need for manual photographing, image processing, and counting operations
Solution Approach 2:
The patent replaces the manual image processing system with an automated optical measurement system. Instead of requiring operators to photograph and process images manually, the light scattering measurement automatically and rapidly determines particle size for all extracted particles, achieving both representativeness and speed
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 approach allows for rapid and highly reproducible measurement of particle size and number density, overcoming the limitations of conventional methods by accurately analyzing particles down to nanometer sizes and reducing analysis time significantly, while minimizing individual operator variations.
Implementation Method 1
a method of analyzing particle size distribution of particles in metal material adopting field flow fractionation (FFF)
Implementation Method 2
followed by laser light scattering to determine particle size and number density
Data Source
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AI summary
A method according to the present invention has: isolating, by extraction, particles contained in a metal material to be analyzed in a solution using a particle isolator; dispersing the particles isolated by extraction into a solvent to prepare a dispersion, and fractionating the dispersion into a plurality of particle dispersions based on particle sizes, using a field flow fractionator; and irradiating laser light on each of the particle dispersions separated based on predetermined particle sizes, to thereby measure absolute values of the particle size based on angular dependence of reflection intensity, and also to thereby measure the number density based on magnitude of reflection intensity.