GB/T 4180-2012 PDF English
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| GB/T 4180-2012 | English | 245 |
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Permanent magnetic material of rare earth cobalt
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| GB/T 4180-2000 | English | 439 |
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Rare earth cobalt permanent magnet material
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| GB/T 4180-1984 | English | RFQ |
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Permanent magnetic material series of rare earth cobalt
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GB/T 4180-2012: Permanent magnetic material of rare earth cobalt---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4180-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.035
K 15
Replacing GB/T 4180-2000
Permanent magnetic material of rare earth cobalt
稀土钴永磁材料
Issued on: DECEMBER 31, 2012
Implemented on: JUNE 01, 2013
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Classification... 6
5 Requirements... 8
6 Test methods... 10
7 Inspection rules... 14
8 Marking, packaging, transportation and storage... 16
Annex A (informative) Other electromagnetic properties and some mechanical and
physical properties of permanent magnetic material of rare earth cobalt... 18
Annex B (informative) Typical demagnetization curve of sintered permanent magnetic
material of rare earth cobalt... 19
Annex C (informative) Typical compounds, manufacturing processes and application
guides of permanent magnetic material of rare earth cobalt... 22
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 4180-2000 "Rare earth cobalt permanent magnet
material".
The main differences between this Standard and GB/T 4180-2000 are as follows.
- The terms and definitions were revised using GB/T 2900.60-2002 and GB/T 9637-
2001.The definition of the temperature coefficient of magnetic moment was
proposed and used as the temperature properties of permanent magnetic materials.
- The naming method of material designations has been supplemented with the
material's structural type identification, magnetic orientation characteristic
identification and temperature properties identification, so that the material
designation can more clearly reflect the characteristics of the material.
- In order to correspond to the existing product designations of manufacturers in this
industry and the habits of users, some new material designations have been added
to the RCo5 series and R2Co17 series. With reference to GB/T 17951-2005
"Standard specification for magnetically hard materials", materials corresponding
to IEC classification codes are given.
- Requirements and test methods have been added for material appearance and
defects, dimensional tolerances, shape and position tolerances, surface roughness,
and temperature properties.
- Inspection rules for materials as well as requirements for marking, packaging,
transportation, storage, etc. have been added.
This Standard was proposed by Ministry of Industry and Information Technology of the
People's Republic of China.
This Standard shall be under the jurisdiction of National Technical Committee on
Magnetic Components and Ferrite Materials of Standardization Administration of
China (SAC/TC 89).
The drafting organizations of this Standard. Southwest Institute of Applied Magnetism.
Main drafters of this Standard. Zhang Ming, Wang Jingdong, Shen Anguo, Gao Xiaoqin.
Versions of standard substituted by this Standard are.
- GB/T 4180-1984;
- GB/T 4180-2000.
Permanent magnetic material of rare earth cobalt
1 Scope
This Standard specifies the terms and definitions, classification, designations,
appearance and defects, dimensions and tolerances, shape and position tolerances,
surface roughness, primary magnetic properties and temperature properties of rare earth
cobalt permanent magnet materials and their test methods. At the same time, this
Standard gives the typical values of some electromagnetic properties and some
mechanical and physical properties. This Standard also specifies the inspection rules,
marking, packaging, transportation and storage of materials.
This Standard applies to permanent magnetic material of rare earth cobalt.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 2828.1-2003, Sampling procedures -- Part 1.retrieval by acceptance quality
limit (AQL) for lot-by-lot inspection sampling plan (ISO 2859-1.1999, IDT)
GB/T 2900.60-2002, Electrotechnical terminology -- Electromagnetism (eqv IEC
60050(121).1998)
GB/T 3217-1992, Method of test of the magnetic properties of permanent magnetic
(magnetically hard) materials (neq IEC 60404-5.1982)
GB/T 9637-2001, Electrotechnical terminology -- Magnetic materials and
components (eqv IEC 60050(221).1990)
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 2900.60-
2002, GB/T 9637-2001 as well as the followings apply.
3.1 primary magnetic properties
The primary magnetic properties of permanent magnetic materials include. remanence
Br, magnetic flux density coercivity HcB, magnetic polarization intensity coercivity HcJ,
and maximum energy product (BH) max.
Inspect the appearance and defects of the materials by visual inspection.
6.2 Dimensional tolerances, shape and position tolerances, surface roughness
The dimensional tolerance, shape and position tolerance, and surface roughness of the
material shall be inspected using measuring tools that meet the metrological
requirements; or inspected using special measuring tools confirmed by both the supplier
and the purchaser.
6.3 Primary magnetic properties and temperature properties
6.3.1 Specimens
The specimens are in accordance with the provisions of GB/T 3217-1992.It is
recommended to use cylindrical magnet specimens with the easy magnetization
direction along the axial direction, a diameter of 8 mm~10 mm, and an aspect ratio of
0.7~1.0.
6.3.2 Magnetization of specimens
Before the test, the specimen in the initial state is magnetized under normal test
atmospheric conditions to achieve magnetic saturation. The recommended minimum
magnetic saturation magnetic field strength of permanent magnetic material of rare
earth cobalt is shown in Table C.1 in Annex C.
6.3.3 Temperature treatment
Before measuring the temperature properties of the specimen, the magnetically
saturated specimen shall be subjected to temperature cycling, that is, the specimen is
heated from the starting temperature T1 to a temperature 20 K higher than the ending
temperature T2 and then naturally cooled to room temperature. Keep the temperature at
T1 and (T2 + 20 K) for 2 h each. This temperature cycle shall be performed at least once.
6.3.4 Primary magnetic properties
a) The specimen size shall comply with the provisions of 6.3.1;
b) Before the test, the specimen magnetization shall comply with the provisions of
6.3.2;
c) The primary magnetic properties test methods of rare earth permanent magnetic
material of rare earth cobalt shall comply with the provisions of GB/T 3217-1992.
6.3.5 Temperature properties
6.3.5.1 Measurement principle
In the Helmholtz coil, the permanent magnet specimen is regarded as a magnetic dipole.
Therefore, the induced electromotive force generated by the permanent magnet
d) After the flux integrator is reset, the computer outputs the rotation command to
rotate the sample 180° around the Y axis;
e) The computer records the data of the flux integrator at this time, that is, the flux
value of the specimen at temperature T1, that is, 2Φ(T1);
f) According to steps b) to e), measure the flux value 2Φ(T2) at temperature T2;
g) According to formula (5), calculate the magnetic moment temperature coefficient
of the sample;
h) The test report shall at least provide the following information.
- Specimen number;
- Specimen material designation;
- Specimen shape and size;
- Measuring device;
- Measurement temperature range;
- αm;
- Signature of the tester and auditor;
- Test date.
7 Inspection rules
7.1 Inspection and acceptance
7.1.1 The supplier’s quality supervision department shall inspect the materials to ensure
that they comply with the requirements of this Standard and provide a quality certificate.
7.1.2 The purchaser shall conduct acceptance inspection on the received materials in
accordance with the provisions of this Standard. If the acceptance inspection results do
not conform to the provisions of this Standard, the purchaser shall submit the
unqualified samples to the supplier within one month from the date of receipt of the
product, and then the supplier and the purchaser shall negotiate to resolve the issue. If
arbitration is required, it may be entrusted to a unit recognized by both parties, and the
supplier and the purchaser shall jointly take samples.
7.2 Batching
Each batch of materials shall consist of materials of the same designation, specifications
and dimensions made by the same production process.
7.3 Inspection items
The inspection items for each batch of materials include the following items. The
increase or decrease of items can be negotiated by the supplier and the purchaser.
- Appearance and defects;
- Dimensions and tolerances;
- Shape and position tolerances;
- Surface roughness of processed surfaces;
- Primary magnetic properties;
- Temperature properties;
- Quality;
- Other inspection items specified in the contract.
7.4 Sampling plans
The sampling plans for each batch of materials are.
a) The sampling plan for appearance and defects shall be in accordance with the
normal inspection sampling plan of GB/T 2828.1-2003, general inspection level
II, AQL=2.5;
b) The sampling plan for dimensions and tolerances shall be in accordance with the
normal inspection sampling plan of GB/T 2828.1-2003, general inspection level
II, AQL=2.5;
c) The sampling plan for shape and position tolerances shall be in accordance with
the normal inspection sampling plan of GB/T2828.1-2003, special inspection
level S2, AQL=1.5;
d) The sampling plan for surface roughness of machined surfaces shall be in
accordance with the normal inspection sampling plan of GB/T 2828.1-2003,
special inspection level S2, AQL=1.5;
e) The sampling plan for primary magnetic properties shall be in accordance with
the normal inspection sampling plan of GB/T 2828.1-2003, special inspection
level S2, AQL=1.5;
f) For the measurement of temperature properties, at least 3 pieces shall be randomly
sampled from each batch;
g) All quality items shall be measured;
h) Other inspection items specified in the contract shall be based on the agreed
sampling plan.
7.5 Qualification determination
According to the sampling plan of 7.4 and the test method of Chapter 6, each batch of
materials shall be inspected for the items specified in 7.3.If the requirements of 5.1 ~
5.3 are met, the batch of materials shall be qualified. If the materials fail to pass the
sampling plan in the normal inspection, double samples shall be taken from the batch
of materials for re-inspection of the unqualified items. If they still fail to pass, the batch
of materials shall be judged as unqualified.
8 Marking, packaging, transportation and storage
8.1 Marking and packaging
8.1.1 Materials are generally delivered in a magnetically neutral state and the
orientation direction is marked. If magnetization is required, this shall be noted in the
contract in advance.
8.1.2 Materials shall be packed in boxes and ensured not to be damaged during
transportation and storage. The packaging of magnetized materials shall comply with
relevant regulations. Each inner box shall be labeled with.
- Supplier name;
- Material name;
- Designation;
- Batch number;
- Specification and size;
- Net mass;
- Date of manufacture.
8.2 Transportation and storage
The materials shall be handled with care during transportation to ensure that they are
not damaged. The materials shall be stored in a ventilated, dry place with no corrosive
atmosphere.
8.3 Quality certificate
A quality certificate shall be attached to each batch of materials when they are delivered.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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