GB/T 18880-2012 PDF English
US$250.00 · In stock · Download in 9 secondsGB/T 18880-2012: Materials for bonded neodymium iron boron permanent magnets Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 18880: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 18880-2012 | English | 250 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Materials for bonded neodymium iron boron permanent magnets
| Valid |
| GB/T 18880-2002 | English | 439 |
Add to Cart
|
4 days
|
Materials of bonded neodymium iron boron permanent magnets
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 18880-2012
GB/T 18880-2012: Materials for bonded neodymium iron boron permanent magnets---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/GBT18880-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.99
H 65
Replacing GB/T 18880-2002
Materials for bonded neodymium iron boron permanent
magnets
ISSUED ON: NOVEMBER 05, 2012
IMPLEMENTED ON: MAY 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 ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Material classification and designation ... 6
5 Requirements ... 7
6 Test methods ... 8
7 Inspection rules ... 9
8 Marks, packaging, transportation, storage, quality certificate ... 10
Annex A (normative) Main anti-rust properties and adhesion properties of products for
bonded neodymium iron boron permanent magnets ... 12
Annex B (informative) Additional magnetic properties and main mechanical and
physical properties of materials for bonded neodymium iron boron permanent magnets
... 14
Annex C (informative) Dimensional and geometric tolerances of materials for bonded
neodymium iron boron permanent magnets ... 15
Annex D (informative) Chemical composition, manufacturing process and application
of materials for bonded neodymium iron boron permanent magnets ... 16
Materials for bonded neodymium iron boron permanent
magnets
1 Scope
This Standard specifies the requirements, test methods, inspection rules and marks,
packaging, transportation, storage, and quality certificates for materials for bonded
neodymium iron boron permanent magnets.
This Standard applies to isotropic bonded materials for bonded neodymium iron boron
permanent magnets and products produced by powder compression molding and
injection molding.
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 2423.17, Environmental testing for electric and electronic products - Part 2:
Test method - Test Ka: Salt mist
GB/T 2423.18, Environmental testing - Part 2: Test methods - Test Kb: Salt mist,
cyclic (sodium chloride solution)
GB/T 2828, Sampling procedures for inspection by attributes
GB/T 3217, Permanent magnet (magnetically hard) materials -- Methods of
measurement of magnetic properties (neq IEC 60404-5)
GB/T 6682, Water for analytical laboratory use -- Specification and test methods
(neq ISO 3696:1987)
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 9637, Electrotechnical terminology -- Magnetic materials and components
GB/T 17803, Designation system for rare earth products
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 principal magnetic properties
Including the remanence (Br) of the permanent magnet material, the magnetic
polarization intensity coercivity (intrinsic coercivity) (HCJ), the magnetic induction
intensity coercivity (HCB), and the maximum magnetic energy product [(BH)max].
3.2 additional magnetic properties
Including the relative recovery magnetic permeability (μrec), remanence temperature
coefficient [α(Br)], magnetic polarization strength coercive force temperature
coefficient [α(HCJ)], and Curie temperature (Tc) of the permanent magnet material.
4 Material classification and designation
4.1 Material classification
The products are isotropic materials for bonded neodymium iron boron permanent
magnets produced by powder compression molding and injection molding processes,
or permanent magnet products in shapes such as rings, cylinders, cuboids, and tiles
directly made from this material. According to the intrinsic coercivity, it is divided into
three categories: low coercivity L, medium coercivity M, and high coercivity H.
Products can be produced directly with magnetic components in their final form. It can
also be assembled with other magnetic or non-magnetic components into devices
(assemblies) or components as the final form.
4.2 Material designation
Each type of product is divided into several designations according to the maximum
magnetic energy product (see Table 1 for details). Its designation representation method
complies with the regulations of GB/T 17803. Each designation of material can be
directly made into permanent magnet products in the shapes of rings, cylinders, cuboids,
tiles, etc.
4.3 Designation representation method
There are two types of designation representation methods: numeric type and character
type. The representation method of digital designation is as follows:
Refer to Annex A for the inspection methods of product anti-rust performance and
adhesion performance.
6.3 Additional magnetic properties and main mechanical and physical properties
The additional magnetic properties and main mechanical and physical properties of the
material are tested using measuring tools that meet accuracy requirements and comply
with national metrology standards, see Annex B.
6.4 Product dimensions and geometric tolerances
The dimensional tolerance and geometric tolerance of the product are tested using
measuring tools that meet the accuracy requirements and comply with national
metrology standards, or with special inspection instruments confirmed by both the
supplier and the purchaser. See Annex C.
6.5 Appearance quality
Use a 10x magnifying glass for product appearance quality inspection.
7 Inspection rules
7.1 Inspection and acceptance
7.1.1 Products are inspected by the supplier's quality and technical supervision
department. Ensure product quality complies with the provisions of this standard. Fill
out the quality certificate.
7.1.2 The purchaser shall inspect the received products in accordance with the
provisions of this Standard. If the inspection results are inconsistent with the provisions
of this Standard, it shall be reported to the supplier within 1 month from the date of
receipt of the product. The matter shall be resolved through negotiation between the
supplier and the purchaser. If arbitration is needed, an agency recognized by both parties
can be entrusted to conduct it, and samples can be taken jointly by the purchaser.
7.2 Batching
Each batch of products shall be composed of materials of the same specifications and
sizes made by the same designation and the same production process.
7.3 Inspection items
Each batch of products shall be inspected for magnetic properties, dimensional
tolerances, geometric tolerances, appearance quality and other items. The sampling
batches, methods, quantities, anti-rust performance index items and qualified quality
levels for anti-rust performance inspection shall be agreed upon by both parties. When
the anti-rust coating materials and processes are changed, inspections shall be carried
out according to the anti-rust performance index items and qualified quality levels
agreed between the supplier and the purchaser.
7.4 Sampling
The sampling quantity of the magnetic properties, dimensional tolerance, and geometric
tolerance of the product shall be carried out in accordance with the provisions of GB/T
2828. Its acceptance qualified quality level (AQL) is level 1.5 of general inspection
level II. The sampling quantity of product appearance quality shall be carried out in
accordance with the provisions of GB/T 2828. Its acceptance quality level (AQL) is
level 1.5 of general inspection level I. All are carried out according to a normal
inspection sampling plan.
The principal magnetic properties of the material and the anti-rust performance of the
product shall be determined by sampling quantity and qualified quality level as agreed
upon by both parties.
7.5 Inspection result judgment
If the product's principal magnetic properties or anti-rust properties, dimensional
tolerances, geometric tolerances, appearance quality and other inspection results are
inconsistent with the provisions of this Standard, double samples will be taken from the
batch of products to re-inspect the unqualified items. If there are still unqualified items,
the batch of products will be judged as unqualified.
8 Marks, packaging, transportation, storage, quality certificate
8.1 Marks, packaging
8.1.1 If the purchaser requires the polarity of the product to be marked, it can be clearly
stipulated in the contract.
8.1.2 Product packaging shall comply with the corresponding regulations on
transportation and storage methods. Generally, foam plastic boxes are used as inner
packaging. The outer packaging is in cartons or wooden boxes. Guarantee against
damage during proper transportation and storage. Each outer packaging shall be marked
with a mark on its surface, indicating:
a) Name of supplier;
b) Product name;
c) Batch number, specification size or product code;
d) Quantity, gross weight, exit-factory date.
8.2 Transportation, storage
In the constant temperature and humidity standard test chamber, put the coated product
specimen. Store at 90% relative humidity and 80℃ ±1℃ test temperature for 240 h.
After taking it out, place it at 23℃±3℃ for 2 h. Use a 10x magnifying glass to observe
the coating surface of the specimen. If there is no rust or expansion phenomenon, it will
be judged as qualified.
A.2.4 Acid resistance test
Put 10 mL of hydrochloric acid [(1+2), chemically pure] into a cleaned 200 mL plastic
bottle. Then add 60 mL of laboratory grade 3 water to prepare hydrochloric acid (1+19).
Then put in the coated product specimen. Cover and leave for 24 h. Then take out the
product specimen. After cleaning, dry at 23°C ±3°C for 2 h. Observe with a 10x
magnifying glass. When the coating film of the specimen (except for the electrode
contacts during coating) does not have swelling, cracking, peeling, bubbles, softening,
dissolution, and no major changes in color and brightness, it is judged to be qualified.
A.2.5 Salt spray resistance test
In the salt spray standard test chamber, put the painted product specimen. The main
conditions for the test must comply with the requirements of GB/T 2423.17 and GB/T
2423.18. The specimen can be properly cleaned before testing. However, abrasives and
solvents with corrosive or inhibitory effects cannot be used for cleaning. The cleaning
method must not damage the surface. After cleaning the specimen, wipe it dry with a
clean cloth or absorbent paper, or blow it dry with oil-free dry air. Handprint
contamination will cause serious adverse test results, so the specimen must not have
any handprint contamination after cleaning. After the salt spray test is completed, the
specimen is taken out and placed at 23°C ±3°C for 2 h. Observe with a 10x magnifying
glass. When the coating film of the specimen (except for the electrode contacts during
coating) does not have swelling, cracking, peeling, bubbles, softening, dissolution, and
no major changes in color and brightness, it is judged to be qualified.
A.2.6 Adhesion tape peeling test
Fix the coated product specimen on the table. Use a single-sided cutting blade to mark
the "#" shape. Be sure to use the tip of the knife when cutting into the knife mark.
Opposite the coating surface, the tip of the knife is perpendicular to the coating surface
and penetrates the coating film. The intervals between each cut are about 1 mm. Then
stick the 3M600 tape on the product specimen marked with the character "#". Lift up
one end of the tape and pull instantly. If there is no defect in the coating film, it will be
judged as qualified.
Annex D
(informative)
Chemical composition, manufacturing process and application of materials for
bonded neodymium iron boron permanent magnets
D.1 Chemical composition of materials for bonded neodymium iron boron
permanent magnets
Material for bonded neodymium iron boron permanent magnets is a permanent magnet
product prepared by mixing and molding NdFeB permanent magnet powder and binder
(including organic binder and low melting point metal). The main components are rare
earth (RE), iron (Fe), boron (B) and binder. Among them, the rare earth is mainly the
metal neodymium (Nd). In order to obtain different properties, some other rare earth
metals such as praseodymium (Pr), lanthanum (La), and cerium (Ce) can be substituted.
Iron can also be partially replaced by other metals such as cobalt (Co), zirconium (Zr),
aluminum (Al), etc. The content of boron is small, but it plays an important role in
forming the intermetallic compound R2Fe14B with a tetragonal crystal structure, giving
the compound high saturation magnetization, high uniaxial anisotropy and high Curie
temperature. Binders are usually polymer resins, such as thermosetting epoxy resin,
thermoplastic nylon and polyphenylene sulfide (PPS).
D.2 Manufacturing process of materials for bonded neodymium iron boron
permanent magnets
The material for bonded neodymium iron boron permanent magnets adopts powder
metallurgy process and composite material process. The compression molding process
usually uses thermosetting resin as the binder. The process is as follows: first, the
smelted alloy is made into magnetic powder through a rapid solidification process, then
mixed with a binder, and then formed into a compact through a compression method.
The compact reaches a certain mechanical strength through curing. In order to increase
the anti-oxidation ability of the product, it is usually necessary to perform surface anti-
rust treatment on the product. The process flow is shown in Figure D.1.
A: Smelting B: Powder preparation C: Mixing with binder D: Compression molding E: Solidifying
F: Surface anti-rust treatment G: Magnetizing H: Final testing I: Finished product
Figure D.1 -- Process flow of compression molded materials for bonded
neodymium iron boron permanent magnets
A B C D E F
G H I
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 18880-2012 be delivered?Answer: The full copy PDF of English version of GB/T 18880-2012 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 18880-2012_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 18880-2012_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 18880-2012 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 18880-2012?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 18880-2012 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 18880-2012?A step-by-step guide to download PDF of GB/T 18880-2012_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 18880-2012".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|