Continuous Hydrogen Pulverization for NdFeB Magnets
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Solution Overview
Problem
The increasing demand for NdFeB rare earth permanent magnetic materials in energy-saving and low-carbon applications exacerbates the shortage of rare earth resources, particularly heavy rare earth elements, necessitating a method to improve magnetism while reducing the usage of these resources.
Innovation Solution
A continuous hydrogen pulverization process and equipment for processing NdFeB rare earth permanent magnetic alloy, involving hydrogen absorption, dehydrogenation, and cooling stages, followed by powdering, compacting, and sintering, to enhance coercive force and reduce rare earth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional hydrogen pulverization method is used, then the magnetism can be improved, but the production efficiency is low and energy cost is high
Solution Approach 1:
The patent divides the hydrogen pulverization process into multiple independent chambers (hydrogen absorption chamber, dehydrogenation chamber, cooling chamber) that can operate simultaneously with multiple charging boxes, enabling parallel processing and improving production efficiency while maintaining the required magnetic properties
Solution Approach 2:
The patent implements a continuous hydrogen pulverization process where multiple charging boxes cycle through different chambers simultaneously, eliminating idle time and ensuring continuous processing, thereby improving production efficiency without compromising the magnetism enhancement
2Device complexity
If traditional single chamber hydrogen pulverization device is used, then the process is simple, but the production is low and energy cost is high
Solution Approach 1:
The patent segments the processing function into multiple specialized chambers (hydrogen absorption, dehydrogenation, cooling) that can handle multiple charging boxes in parallel, increasing production capacity while keeping each chamber's internal structure relatively simple and easy to operate
Solution Approach 2:
Each chamber in the patent is designed to handle multiple charging boxes simultaneously and can be used for different stages of the hydrogen pulverization process, making the equipment multi-functional and highly productive without excessive complexity
3Strength
If more heavy rare earth elements are used, then the coercive force can be improved, but the resource shortage and cost increase
Solution Approach 1:
The patent changes the physical and chemical parameters of the alloy flakes through controlled hydrogen absorption and dehydrogenation processes, transforming the microstructure to achieve higher coercive force without requiring additional heavy rare earth elements, thus reducing resource consumption and cost
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 significantly improves the performance and coercive force of NdFeB permanent magnets, reducing the need for heavy rare earth elements and lowering production costs by optimizing the hydrogen pulverization process and equipment design.
Implementation Method 1
passing the charging box which is driven by a transmission device orderly through a hydrogen absorption chamber
Implementation Method 2
the continuous hydrogen pulverization equipment comprises at least one heating and dehydrogenating chamber, having a temperature controlled at between 600° C. and 900° C. for dehydrogenating
Implementation Method 3
passing the charging box which is driven by a transmission device orderly through a hydrogen absorption chamber, a heating and dehydrogenating chamber and a cooling chamber
Data Source
AI summary
A method and an equipment for processing NdFeB rare earth permanent magnetic alloy with a hydrogen pulverization are provided. The method includes steps of: providing a continuous hydrogen pulverization equipment; while driving by a transmission device, passing a charging box loaded with rare earth permanent magnetic alloy flakes orderly through a hydrogen absorption chamber, having a temperature of 50-350° C. for absorbing hydrogen, a heating and dehydrogenating chamber, having a temperature of 600-900° C. for dehydrogenating, and a cooling chamber of the continuous hydrogen pulverization equipment; receiving the charging box by a discharging chamber through a discharging valve; pouring out the alloy flakes after the hydrogen pulverization into a storage tank at a lower part of the discharging chamber; sealing up the storage tank under a protection of nitrogen; and, moving the charging box out through a discharging door of the discharging chamber and re-loading, for repeating the previous steps.