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GB/T 45756-2025Technical specification of sintered rare earth permanent magnet splicing (English PDF)

烧结稀土永磁体拼接技术规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

June 30, 2025

Implementation date

January 1, 2026

Scope

GB/T 45756-2025 is the English-translated version of 烧结稀土永磁体拼接技术规范.

GB/T 45756-2025 is the Chinese national standard covering gluing several small sintered magnets into one large piece — the unit magnets and the adhesive, the bonding assembly, the machining and the surface protection, the tensile and compression shear strength of the joint, the coating thickness, the behaviour under steady damp heat and the irreversible flux loss at temperature, and the reason for splitting a magnet at all, which is to break the eddy current path through it. First edition, in force from 1 January 2026. Issued on 30 June 2025, it has been in force since 1 January 2026.

Document preview — GB/T 45756-2025

National Standard of the People's Republic of China

ICS: 77.120.99
Classification: H 65

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
3.1 Unit component magnets
3.2 Adhesive magnets

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 and coordinated by the National Rare Earth Standardization Technical Committee (SAC/TC229).

This document was drafted by: Ningbo Yunsheng Co., Ltd., Anhui Dadixiong New Materials Co., Ltd., Fujian Jinlong Rare Earth Co., Ltd.

Co., Ltd., Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Hangzhou Meimag Technology Co., Ltd., Ningbo Ketian Magnetics Co., Ltd., Youyan Rare Earth (Rongcheng) Co., Ltd., Ningbo Tongchuang Strong Magnetic Materials Co., Ltd., Baotou Yingsite Rare Magnetic New Materials Co., Ltd., Baotou Rare Earth Research Institute, Hangzhou Qianshi Technology Co., Ltd., Jiangxi Zhongshi New Materials Co., Ltd., Qiandong Rare Earth Group Co., Ltd., Hangzhou Kede Magnetics Co., Ltd., Hangzhou Quadrant Technology Co., Ltd., YUYAN Rare Earth New Materials Co., Ltd., Ningbo Zhaobao Magnetics Co., Ltd., Zhongkesan Huan (Ganzhou) New Materials Co., Ltd., Ganzhou Fulte Electronics Co., Ltd., Baotou Jinshan Magnetic Materials Co., Ltd., Nonferrous Metals Technology and Economics RESEARCH INSTITUTE LIMITED.

The main drafters of this document are: Zhang Min, Shen Guodi, He Jianlin, Yang Xiaolu, Li Zhao, Zhu Xiaodong, Chen Jingwu, Zhang Jiulei, Wang Chunguo, Jia Shengli, Yan Changjiang, Luo Yang, Chen Kan, Dong Gaihua, Fu Jianlong, Zhao Ningning, Chen Haibo, Yao Nanhong, Qi Yufeng, Zhao Yi, Yan Wenlong, Lin Jianqiang, Xiang Chuntao, Qi Zhiqi, Wang Yu, Li Kehui, Pan Weidong, Pan Jiajing, Huang Xiulian, Zhan Lichun, Kan Rong, Zhang Chaoyue, Cheng Junfeng, Song Guanyu, Shen Lihan, and Wu Cenyang.

Technical Specifications for Splicing Sintered Rare Earth Permanent Magnets

1 Scope

This document specifies the requirements for sintered rare earth permanent magnet materials, bonding assembly, machining and surface protection for sintered rare earth permanent magnet splicing.

The corresponding detection and testing methods are described.

This document is applicable to the use of adhesive bonding, with the purpose of reducing eddy current loss and improving surface magnetism, and only includes sintered rare earth permanent magnet materials and adhesives.

Manufacturing process of sintered rare earth spliced permanent magnets with adhesive.

2 Normative references

GB/T 2423.50

GB/T 4180

GB/T 6462

GB/T 7124

GB/T 13560

GB/T 34491

GB/T 38437

GB 39176

GB/T 40790

GB/T 40793

GB/T 40794

GB/T 42160-2022

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Unit component magnets

A single permanent magnet is made of sintered rare earth permanent magnet material through machining and surface protection or only machining.

Note. Sintered rare earth permanent magnet materials include sintered rare earth iron boron or rare earth cobalt permanent magnet materials. Sintered rare earth iron boron is sintered neodymium iron boron permanent magnet materials, grain boundary diffusion A general term for NdFeB permanent magnet materials, sintered cerium and cerium-rich permanent magnet materials.

3.2 Adhesive magnets

A permanent magnet is obtained by bonding two or more unit bodies prepared only by mechanical processing with an adhesive.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 2423.50 · GB/T 6462 · GB/T 7124 · GB/T 38437

Editions of GB/T 45756

Edition	Title	Revision	Status
GB/T 45756-2025	Technical specification of sintered rare earth permanent magnet splicing	current edition	Current

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