GB/T 18880-2012 English PDF (GBT18880-2012)

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GB/T 18880-2012: Materials for bonded neodymium iron boron permanent magnets
GB/T 18880-2012
ICS77.120.99
H65
National Standards of People's Republic of China
Replacing GB/T 18880-2002
Bonded NdFeB
Issued on. 2013-05-01 2012-11-05 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is in accordance with GB/T 1.1-2009 given rules drafted.
This standard replaces GB/T 18880-2002 "bonded NdFeB permanent magnet materials."
This standard compared with GB/T 18880-2002, the main technical changes are as follows.
--- Increasing the reference standard "GB/T 2423.17" electric and electronic products environmental testing procedures Test Ka. Salt Spray Test side
Law "" and "GB/T 2423.18" electric and electronic products environmental testing procedures Test Kb. Salt Spray Test Method for Alternating (chloride
Sodium solution) "";
--- In the original numeric grades based on the increase in the corresponding character brands;
--- Increased 048136A, 048134B, 048135B, 048136B, 048141B material grades;
--- The M types of compression-molding magnet HCJ values \u200b\u200bwere adjusted to 640kA/m ~ 1035kA/m, 048135A material grades
(BH) max value is adjusted to 80kJ/m3 ~ 88kJ/m3, the density value was adjusted to 6.0 ~ 6.3,048132B HCJ value is adjusted
600kA/m ~ 750kA/m, Br value adjustment 048133B is 0.48T ~ 0.55T, HCJ value adjusted to 600kA/m ~
750kA/m, (BH) max value is adjusted to 40kJ/m3 ~ 48kJ/m3, the density value was adjusted to 5.0 to 5.5;
--- Added Appendix A of the salt spray resistance test;
--- Appendix B, Table B.1, B.2 of hardness (HRB) were adjusted to 40, 45;
--- Tables in Appendix C C.1, C.2 diameter range are increased " > 50 to 80 > 80 to 100 > 100" third gear.
This standard by the National Standardization Technical Committee of rare earth (SAC/TC229) centralized.
This standard is drafted by. Institute of Nuclear Industry eighth.
Participated in the drafting of this standard. Beijing Zhong Ke San Huan High-tech Co., Institute of Rare Earth New Materials Co., Ltd.
The main drafters of this standard. Chen Gang, Yang Xiaoling, Lu Weiguo, Rao Xiao Lei, Gu Jingdong, Li Gang, Gao Lan.
This standard replaces the standards previously issued as follows.
--- GB/T 18880-2002.
Bonded NdFeB
1 Scope
This standard specifies requirements for bonded NdFeB permanent magnet materials, test methods, inspection rules and signs, packaging, transportation, storage, quality certificate
Manual.
This standard applies to powder compression molding and injection molding process to produce isotropic bonded NdFeB permanent magnet materials and products.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated edition applies to this article
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 2423.17 Electrical and Electronic Products Environmental Testing Part 2. Test methods - Test Ka. Salt
GB/T 2423.18 Electrical and Electronic Products Environmental Testing Part 2. Test methods - Test Kb. Salt mist, cyclic (sodium chloride solution)
GB/T 2828 Sampling procedures for inspection
GB/T 3217 permanent magnet (magnetically hard) magnetic material test methods (neqIEC 60404-5)
GB/T 6682 analytical laboratory use specifications and test methods (neqISO 3696. 1987)
GB/T 8170 rounding off rules limiting values \u200b\u200brepresent the judgment
GB/T 9637 Electrotechnical terminology Magnetic materials and components
GB/T 17803 grades representation of rare earth products
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
The main magnetic principalmagneticproperties
Including remanence permanent magnet materials (Br), coercivity magnetic polarization (intrinsic coercivity) (HCJ), magnetic induction coercive force (HCB), the largest
Energy product [(BH) max].
3.2
Assisted magnetic additionalmagneticproperties
Including the relative recoil permeability of permanent magnet material (μrec), remanence temperature coefficient [α (Br)], the intensity of the magnetic coercivity temperature coefficient
[Α (HCJ)], the Curie temperature (Tc).
4 material classification and designation
4.1 material classification
Products for the powder compression molding process and injection molding process to produce isotropic bonded NdFeB material or material prepared directly therefrom
Into rings, cylinders, rectangular, and other tile-shaped permanent magnet products, according to the intrinsic coercivity divided into low coercivity L, coercivity M, high
Coercivity H three varieties of products can be directly used as a final form of the magnetic element, but also with other magnetic or nonmagnetic elements assembled Synthesizer
(Group) member or members as the final form.