GB/T 34490-2017 in English
VALIDRecycled sintered neodymium iron boron permanent magnets
- Issued on:2017-10-14
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Within 1 day
$125.00
《GB/T 34490-2017再生烧结钕铁硼永磁材料》由TC229（全国稀土标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
National Standard of the People's Republic of China GB/T 34490—2017
Performance Standard and Application Interpretation of Recycled Sintered NdFeB Permanent Magnet Materials
1. Background and Significance of Standard Formulation
With the increasing depletion of rare earth resources and the increasing pressure on environmental protection, recycling has become an inevitable trend in the development of NdFeB permanent magnet materials. The introduction of GB/T 34490—2017 "Recycled Sintered NdFeB Permanent Magnet Materials" fills the domestic standard gap in this field and provides a scientific basis for the quality control, performance testing and application of recycled materials.
As the core of high-performance rare earth permanent magnet materials, NdFeB permanent magnet materials are widely used in electronics, automobiles, medical and other fields. If the waste materials generated in its production process can be effectively recycled, it can not only reduce resource consumption, but also reduce environmental pollution, and has important social and economic value.
2. Comparative analysis of standard frameworks
| Standard dimensions | Regenerated sintered NdFeB | Traditional sintered NdFeB | Other rare earth permanent magnet materials |
|---|---|---|---|
| Raw material source | Waste NdFeB material | High purity rare earth compounds | Other rare earth alloys |
| Performance indicators | Magnetic property retention rate after regeneration ≥90% | Initial magnetic properties ≥120 kJ/m³ | Depending on the material type |
| Environmental protection | Low resource consumption, reducing rare earth waste | High energy consumption, requiring large amounts of rare earth mining | Depending on the material recycling situation |
3. Interpretation of the core content of the standard
3.1 Raw material selection and classification
The standard clearly stipulates that the raw materials of recycled sintered NdFeB permanent magnet materials must come from waste sintered NdFeB materials, and are divided into five categories according to the total rare earth content and dysprosium content (see Table 1). This classification method ensures the quality consistency of recycled materials and provides a clear basis for subsequent performance testing.
Case Analysis:
An electronic manufacturing company uses waste NdFeB waste as raw materials. Through testing, it is found that its total rare earth content is ≥28.5%, and the dysprosium content is between 0.5% and 2.0%, so it is classified as Class II material. After recycling, the permanent magnet material produced meets the N class standard in performance.
3.2 Material classification and grades
Materials are divided into five categories according to coercivity: low, medium, high, extra-high and ultra-high coercivity, corresponding to different application scenarios. Each category is further divided into specific grades (such as S-NdFeB-280/111R) according to the maximum magnetic energy product to ensure that the material has a high degree of flexibility in design and selection.
Case Study:
An automobile manufacturer needs high-performance motor magnets and chooses S-NdFeB-380/111R (class N) because of its high coercivity and excellent temperature resistance, which is suitable for the power system of electric vehicles.
3.3 Performance Requirements
In terms of chemical composition, the total amount of rare earth in recycled materials must be ≥30% to ensure that its magnetic properties are not inferior to traditional materials. The main magnetic performance indicators such as maximum magnetic energy product and coercivity meet or exceed international standards.
4. Implementation Suggestions and Future Prospects
4.1 Technical Application Suggestions
Enterprises should establish a complete raw material classification and testing system to ensure the quality stability of recycled materials. At the same time, the oxygen content and other impurities are strictly controlled during the production process to improve the performance consistency of the recycled materials.
4.2 Quality Control
It is recommended that enterprises use advanced testing equipment (such as ICP spectrometers) to analyze rare earth components and regularly test key magnetic performance indicators. For unqualified products, remelting or other remedial measures should be taken.
4.3 Future Development Direction
With technological advances, the application scope of recycled NdFeB materials will be further expanded in the future. It is recommended to strengthen research and development, explore higher performance recycling processes, and promote their application in new energy vehicles, wind power generation and other fields.
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