SmFeN Bonded Magnet Composition Using Amorphized Nylon 12
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Solution Overview
Problem
Existing bonded magnets have limited heat resistance, which is a critical issue for their application in high-temperature environments.
Innovation Solution
Incorporating a SmFeN magnetic powder and nylon 12 with a hexafluoroisopropanol-unextractable component, formed through contact with an amorphizing agent and heat treatment, to enhance the heat resistance of bonded magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional bonded magnets are used, then manufacturing is simple, but heat resistance is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-forming the bonded magnet with nylon 12 and SmFeN magnetic powder, then subsequently treating it with an amorphizing agent before heat treatment. This sequence of pre-preparation steps enables the formation of the hexafluoroisopropanol-unextractable component that provides superior heat resistance, while keeping the base manufacturing process relatively simple.
Solution Approach 2:
The patent utilizes parameter changes by transforming the crystalline nylon 12 into an amorphous state through contact with an amorphizing agent followed by heat treatment at 100-200°C. This phase change from crystalline to amorphous structure creates the hexafluoroisopropanol-unextractable component, which significantly improves heat resistance without requiring complex manufacturing modifications.
2Temperature
If nylon 12 is used as binder, then processability is good, but heat resistance is limited
Solution Approach 1:
The patent applies phase transitions by converting nylon 12 from its conventional crystalline state to an amorphous state through treatment with an amorphizing agent and heat treatment. This phase transition creates a fundamentally different molecular structure that forms the hexafluoroisopropanol-unextractable component, which exhibits superior resistance to oxidative degradation and enhanced heat resistance while maintaining the good processability of nylon 12.
3Temperature
If heat treatment temperature is increased, then heat resistance improves, but material degradation occurs
Solution Approach 1:
The patent utilizes parameter changes by implementing heat treatment at relatively low temperatures (100-200°C) after amorphizing the nylon 12 with an amorphizing agent. This two-stage approach (amorphization followed by low-temperature heat treatment) enables the formation of the hexafluoroisopropanol-unextractable component that provides high heat resistance without subjecting the material to high-temperature degradation, thus preserving material integrity while achieving superior heat resistance.
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 resulting bonded magnets exhibit improved heat resistance, demonstrated by higher heat deflection temperatures and bending strength retention, making them suitable for applications in motors and other high-temperature uses.
Implementation Method 1
bringing a raw material bonded magnet containing a SmFeN magnetic powder and nylon 12 into contact with an amorphizing agent; and heat-treating the raw material bonded magnet in contact with the amorphizing agent
Implementation Method 2
heat-treating the raw material bonded magnet in contact with the amorphizing agent
Data Source
AI summary
The present invention provides a bonded magnet having good heat resistance. The present invention relates to a bonded magnet containing a SmFeN magnetic powder, nylon 12, and a hexafluoroisopropanol-unextractable component. The present invention also relates to a method of preparing a bonded magnet, including: bringing a raw material bonded magnet containing a SmFeN magnetic powder and nylon 12 into contact with an amorphizing agent; and heat-treating the raw material bonded magnet in contact with the amorphizing agent.