Spherical Particle Manufacturing with FF-Controlled Melt Spheroidization
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Solution Overview
Problem
Existing methods for producing spherical particle materials, such as the VMC and melting methods, face challenges in controlling particle size distribution and achieving high melting spheroidization ratios, particularly when producing alumina, leading to defects like unmelted particles and broad particle size distributions.
Innovation Solution
A production method involving a raw particle material preparation step followed by a spheroidization step, where the raw particle material is fed into a high-temperature atmosphere and rapidly cooled, with a powder compressibility evaluation FF value of 2.0 or more, ensuring uniform particle size distribution and high melting spheroidization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the melting method is used to produce spherical particle material, then the particle size distribution can be controlled to some extent, but melting is not completely performed and unmelted particles are mixed in
Solution Approach 1:
The patent changes the physical-chemical parameters of the raw material by controlling the FF value (a measure of powder compressibility and spheroidization ability) to be 2.0 or more. This parameter control ensures complete melting during the spheroidization process while maintaining desired particle size distribution, resolving the contradiction between manufacturing precision and reliability
Solution Approach 2:
The patent performs preliminary selection and preparation of raw materials with specific FF values before the spheroidization process. By pre-screening raw materials to meet the FF value requirement, the process ensures complete melting occurs during spheroidization, preventing unmelted particles from mixing in the final product
2Manufacturing precision
If large particle material produced by agglomerating small particle material is used as raw material for melting method, then particle size distribution can be controlled, but destruction of agglomerated particle material occurs
Solution Approach 1:
The patent changes the approach from using agglomerated materials to using raw materials characterized by FF value (≥2.0). This parameter-based selection ensures the raw material has appropriate spheroidization ability without the structural weaknesses of agglomerated particles, preventing destruction during melting while maintaining particle size distribution control
3Manufacturing precision
If the VMC method is used to produce alumina spherical particle material, then particle size distribution can be controlled by controlling metal particle material properties, but the control range is not completely free and is particularly difficult to expand when producing alumina
Solution Approach 1:
The patent transitions from the VMC method to a melting method where the key control parameter is the FF value of the raw material (≥2.0). This parameter change expands the control range and improves adaptability, as the FF value directly correlates with spheroidization ability and can be controlled across different material types, including alumina, providing both precision and flexibility
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 produces spherical particle materials with high melting spheroidization ratios and small specific surface areas, suitable for use as fillers in resin compositions.
Implementation Method 1
a spheroidization step of feeding the raw particle material into a high-temperature atmosphere to melt the raw particle material
Implementation Method 2
then rapidly cooling the raw particle material to prepare a spherical particle material
Data Source
AI summary
An object is to provide a production method that is a method for producing a spherical particle material by a melting method and that makes a melting spheroidization ratio higher than the conventional method. A production method for a spherical particle material of the present disclosure achieving the above object includes: a raw particle material preparation step of preparing a raw particle material composed of an inorganic material; and a spheroidization step of feeding the raw particle material into a high-temperature atmosphere to melt the raw particle material and then rapidly cooling the raw particle material to prepare a spherical particle material having a volume average particle diameter of 1 μm or more and less than 10 μm, and a powder compressibility evaluation FF value, by a powder rheometer, of the raw particle material is 2.0 or more.