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ASTM A1054-07

(Specification)

Standard Specification for Sintered Ceramic Ferrite Permanent Magnets

Standard Specification for Sintered Ceramic Ferrite Permanent Magnets

ABSTRACT
This specification covers technically important, commercially available, magnetically hard sintered ceramic ferrite permanent magnets. Both barium and strontium ferrite materials are covered by this specification. Both isotropic (1 type) and anisotropic (12 types) are covered. A cross reference to both IEC and MMPA designations is provided. The magnetic property requirements for each type are defined as is the method of test. Other defined requirements include the workmanship. Typical physical properties are listed in the appendices.
SCOPE
1.1 This specification covers technically important, commercially available, magnetically hard sintered ceramic ferrite permanent magnets.
1.2 Ceramic ferrite magnets have residual magnetic induction Br from 2000 G (0.2 T) up to about 5000 G (0.5 T) and intrinsic coercive field strength Hci (HcJ) from 2000 Oe (160 kA/m) up to about 5000 Oe (400 kA/m). Their specific magnetic hysteresis behavior (demagnetization curve) can be characterized using Test Method A 977/A 977M.
1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-2007
ICS
29.030 - Magnetic materials
Technical Committee
A06 - Magnetic Properties
Drafting Committee
A06.02 - Material Specifications
Current Stage
Ref Project

Relations

Replaced By
ASTM A1054-14 - Standard Specification for Sintered Ceramic Ferrite Permanent Magnets
Effective Date
15-May-2014

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ASTM A1054-07 - Standard Specification for Sintered Ceramic Ferrite Permanent MagnetsASTM A1054-07 - Standard Specification for Sintered Ceramic Ferrite Permanent Magnets
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ASTM A1054-07 - Standard Specification for Sintered Ceramic Ferrite Permanent Magnets
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A1054 −07
StandardSpecification for
Sintered Ceramic Ferrite Permanent Magnets
This standard is issued under the fixed designation A1054; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope for individual materials Section 1 – Standard specifica-
tions for magnetically hard materials
1.1 This specification covers technically important, com-
International Air Transport Association (IATA) Dangerous
mercially available, magnetically hard sintered ceramic ferrite
Goods Regulations, Packing Instruction 902
permanent magnets.
1.2 Ceramic ferrite magnets have residual magnetic induc-
3. Terminology
tion Br from 2000 G (0.2 T) up to about 5000 G (0.5 T) and
3.1 The terms and symbols used in this specification are
intrinsic coercive field strength H (H ) from 2000 Oe
ci cJ
defined in Terminology A340.
(160 kA/m) up to about 5000 Oe (400 kA/m). Their specific
magnetic hysteresis behavior (demagnetization curve) can be
4. Classification
characterized using Test Method A977/A977M.
4.1 The classification of ceramic ferrite permanent magnets
1.3 The values stated in customary (cgs-emu and inch-
is given in Tables 1 and 2, with cross-reference to MMPA
pound) units are to be regarded as standard. The values given
Standard No. 0100-00 and IEC 60404-8-1 standards.
in parentheses are mathematical conversions to SI units which
5. Ordering Information
are provided for information only and are not considered
standard.
5.1 Orders for parts conforming to this specification shall
1.4 This standard does not purport to address all of the include the following information:
safety concerns, if any, associated with its use. It is the 5.1.1 Reference to this standard and year of issue/revision.
responsibility of the user of this standard to establish appro- 5.1.2 Reference to an applicable part drawing.
priate safety and health practices and determine the applica- 5.1.3 Magnetic property requirements if they are more
bility of regulatory limitations prior to use. stringent that the minimum values listed in the tables.
5.1.4 Quantity required.
2. Referenced Documents
5.1.5 The required magnetization state of the provided
material (unmagnetized, fully magnetized, magnetized and
2.1 ASTM Standards:
thermally stabilized, magnetized and partially demagnetized or
A340 Terminology of Symbols and Definitions Relating to
“calibrated”). This information should appear on the part
Magnetic Testing
drawing whenever possible.
A977/A977M Test Method for Magnetic Properties of High-
5.1.6 Certification of magnetic property evaluation.
Coercivity Permanent Magnet Materials Using Hyster-
5.1.7 Marking and packaging requirements.
esigraphs
5.1.8 Exceptions to this specification or special require-
2.2 Other Standards:
mentssuchasplating,coating,orfunctionaltestingasmutually
MMPA Standard No. 0100-00 Standard Specifications for
3 agreed upon by the producer and user.
Permanent Magnet Materials
IEC 60404-8-1, Magnetic Materials Part 8: Specifications
6. Chemical Composition
6.1 The general chemical composition of ceramic ferrite
magnets is MO · 6Fe O with M being barium, strontium, or
This specification is under the jurisdiction of ASTM Committee A06 on
2 3
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
some combination of the two. New ferrite grades may also
Material Specifications.
include some rare earth elements. Chemical compositions
Current edition approved May 1, 2007. Published June 2007. DOI: 10.1520/
listed in the tables are typical and are not guaranteed.
A1054-07.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from IEC (International Electrotechnical Commission) Central Office
the ASTM website. 3, rue de Varembé, P.O. Box 131, CH - 1211, GENEVA 20 Switzerland.
3 5
Available from The International Magnetics Association (IMA), 8 South Available from IATA, 800 PlaceVictoria, PO Box 113, Montréal, Quebec, H4Z
Michigan Avenue, Suite 1000, Chicago, IL 60603. 1M1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A1054−07
TABLE 1 Classification and Minimum Magnetic Property Requirements for Isotropic Sintered Ceramic Ferrite Magnets
Material Magnetic Properties
ASTM MMPA Original IEC IEC Maximum Remanent Normal Intrinsic Relative
A
Designation Brief MMPA Brief Code Energy Induction Coercive Coercive Recoil
Designation Class Designa- Refer- Product, Br, Field Strength, Field Strength, Permeability,
tion ence MGOe gauss (mT) Hc (HcB) H (H ) µrec G/Oe
ci cJ
(kJ/m ) oersted (kA/m) oersted (kA/m)
CE-I-01 . . . S1-0-1 1.05 (8.4) 2300 (230) 1860 (148) 3250 (259) 1.2
A
Designations are XX-Y-ZZZ where:
XX = material type (CE = ceramic ferrite),
Y = processing and orientation (I = isotropic (non-oriented), A = anistropic (oriented)), and
ZZZ = numeric grade designation.
TABLE 2 Classification and Minimum Magnetic Property Requirements for Anisotropic Sintered Ceramic Ferrite Magnets
Material Magnetic Properties
ASTM MMPA Original IEC IEC Maximum Remanent Normal Intrinsic Relative
A
Designation Brief MMPA Brief Code Energy Induction Coercive Coercive Recoil
Designation Class Designa- Refer- Product, Br, Field Strength, Field Strength, Permeability
tion ence MGOe gauss (mT) Hc (HcB) H (H ) µrec G/Oe
ci cJ
(kJ/m ) oersted (kA/m) oersted (kA/m)
CE-A-02 . Ceramic . . 1.8 (14.3) 2900 (290) 2400 (191) 3000 (239) 1.1
CE-A-05 3.4/2.5 Ceramic Hard fer- S1-1-6 3.40 (27.1) 3800 (380) 2400 (191) 2500 (199) 1.1
5 rite 26/18
CE-A-06 . Ceramic . . 2.45 (19.5) 3200 (320) 2820 (225) 3300 (263) 1.1
CE-A-07 2.7/4.0 Ceramic Hard fer- S1-1-2 2.75 (21.9) 3400 (340) 3250 (259) 4000 (318) 1.1
7 rite 20/28
CE-A- 3.5/3.1 Ceramic Hard fer- S1-1-5 3.50 (27.9) 3850 (385) 2950 (235) 3050 (243) 1.1
08A 8A rite 25/12
CE-A- . Ceramic . . 4.12 (32.8) 4200 (420) 2913 (232) 2960 (236) 1.1
08B 8B
CE-A-10 . Ceramic . . 3.82 (30.4) 4000 (400) 3617 (288) 3510 (280) 1.1
CE-A-11 . Ceramic . . 4.32 (34.4) 4300 (430) 2512 (200) 2560 (204) 1.1
CE-A-21 3.4/3.9 . . . 3.40 (27.1) 3800 (380) 3400 (271) 3900 (310) 1.1
CE-A-22 4.0/2.9 . . . 4.00 (31.8) 4100 (410) 2800 (223) 2900 (231) 1.1
CE-A-23 3.2/4.8 . . . 3.20 (25.5) 3700 (370) 3500 (279) 4800 (382) 1.1
CE-A-24 3.8/4.0 . . . 3.80 (30.3) 4000 (400) 3560 (283) 4000 (318) 1.1
A
Designations are XX-Y-ZZZ where:
XX = material type (CE = ceramic ferrite),
Y = processing and orientation (I = isotropic (non-oriented), A = anistropic (oriented)), and
ZZZ = numeric grade designation.
7. Physical and Mechanical Properties along the axis of magnetization. Properties for anisotropic
(magneticallyoriented)magnetsaremeasuredalongtheaxisof
7.1 Typical thermal properties are listed in Appendix X1.
preferred orientation.
7.2 Typical physical properties are listed in Appendix X2.
8.4 Because of the nature of permanent magnet production,
7.3 Physical density values are given for information pur-
magnetic testing of each lot is strongly recommended, espe-
poses only and are not guaranteed.
ciallyforapplicationswherethemagnetperformanceisclosely
specified. Such magnetic property evaluations shall be con-
7.4 Ceramic magnets are used for their magnetic character-
d
...

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1.2 The equipment and procedures described in this test method are most suited for soft and semi-hard materials with intrinsic coercivity less than about 100 Oersteds [8 kA/M]. Materials with higher intrinsic coercivities should be tested according to Test Method A977/A977M.  
1.3 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM A34/A34M-06(2021)(Practice)
Standard Practice for Sampling and Procurement Testing of Magnetic Materials

SIGNIFICANCE AND USE
4.1 This practice defines test lots and describes the selection and preparation of test specimens used in the determination of magnetic properties of various materials.  
4.2 A method of calculating the density of iron-base electrical steels is given and a table of assumed densities for magnetic testing of commercial soft magnetic alloys is provided.
SCOPE
1.1 This practice covers sampling procedures and test practices for determination of various magnetic properties of both soft and hard magnetic materials.  
1.2 This practice may be used either in conjunction with, or independent of, the standard test methods and materials specifications under the jurisdiction of ASTM Committee A06. In the former situation, the sampling and testing procedures listed herein shall not supersede those found in the individual test methods and materials specifications. In the latter situation, the sampling and testing procedures listed herein shall strictly apply.  
1.3 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets except for the sections concerning calculations where there are separate sections for the respective unit systems. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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