GB/T 44656-2024Specification of polymer-bonded anisotropic ferrite permanent magnetic compounds for injection molding (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part

1.Structure and drafting rules for standardization documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee for Standardization of Electrical Alloys (SAC/TC228). This document was drafted by: Hangzhou Qianshi Technology Co., Ltd., Beikuang Magnetic Materials Technology Co., Ltd., Zhejiang Ante Magnetic Materials Co., Ltd., Suzhou Jiaqishi Technology Co., Ltd., Jiangxi Zhongshi New Materials Co., Ltd., Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Zhejiang University of Technology, Zhejiang Lixin New Materials Co., Ltd., Guilin Electric Science Research Institute Co., Ltd., Dongguan Sanyou Automotive Electrical Appliance Co., Ltd., Hangzhou Quadrant Technology Co., Ltd., China University of Metrology, Hangzhou Kede Magnetics Co., Ltd., Ningbo Xinglong Magnetic Technology Co., Ltd., Jiangsu CRRC Motor Co., Ltd., Baotou Inspection and Testing Center, Dongyang Fushite Magnetics Co., Ltd., Hebei University of Technology, Ningbo Yima Magnetics Co., Ltd. Southwest Institute of Applied Magnetism, Guilin University of Electronic Technology, Jinhua Jiuhe Magnetoelectric Technology Co., Ltd., Jiangmen Maiwei Electronic Technology Co., Ltd. Company, Guangzhou Jinnan Magnetic Materials Co., Ltd., Huizhou Xuzhan Magnetic Materials Co., Ltd. The main drafters of this document are. Cai Wei, Zhang Pengjie, Zhao Ningning, Ren Feng, Chen Haibo, Lian Jiangbin, Che Shenglei, Wang Yongjie, Sun Yingli, Huang Lanxia, Tang Junping, Zhao Yi, Wu Qiong, Wang Zhanguo, Li Zhengyu, Wang Jianliang, Wei Xing, Shen Tuhang, Wang Jingqin, Ying Ying, Zhou Qixuan, Zhang Yanli, Chen Taishan, Zeng Kanxiong, An Aimin, Feng Yong, Li Qinghua, Tao Zhizhuan, and Wang Jiahui. Injection molding anisotropic ferrite permanent magnet composite particles Technical conditions

1 Scope

GB/T 44656-2024 specifies the polymer-bonded anisotropic ferrite compounds used for injection moulding permanent magnets. Injection moulding lets a magnet be produced in a complex shape, with insert-moulded features and tight tolerances, at a cost sintering cannot match; making it anisotropic - aligning the ferrite particles in a field as the melt fills the cavity - roughly doubles the energy product but makes the compound's flow behaviour and particle loading critical, since a compound that is too filled will not orient and one that is not filled enough is weak. The standard sets the classification and grades, the technical requirements covering appearance, magnetic properties and mechanical and physical properties, the test methods for each, and the inspection rules and packaging, marking, transport and storage provisions. It takes effect on 1 April 2025.

This document defines the terminology of injection molded anisotropic ferrite permanent magnet composite particles, gives the classification and grade, and specifies the injection molding The technical requirements, inspection rules, marking, packaging, transportation, storage and quality certificate of anisotropic ferrite permanent magnet composite particles are described. Corresponding test methods. This document applies to anisotropic ferrite permanent magnet composite particles used in injection molded magnets.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 1033.1 Plastics - Determination of density of non-cellular plastics - Part

3 Terms and definitions

The terms and definitions defined in GB/T 9637 and the following apply to this document.

3.1 Anisotropic ferrite powder is used as the matrix, thermoplastic resin is used as the binder, and appropriate amount of additives are added. After granulation, it is used for injection molding. Composite functional materials.

4 Classification and brand

4.1 Classification Materials are classified according to the type of thermoplastic resin and divided into several grades according to the maximum magnetic energy product.