ASTM A1054-14

Standard Specification for Sintered Ceramic Ferrite Permanent Magnets

ABSTRACT
This specification covers technically important, commercially available, magnetically hard sintered ceramic ferrite permanent magnets. Magnetic properties such as remanence, coercive field strength, and relative recoil permeability shall be measured. The specified magnetic properties are valid only for magnet test specimens with a uniform cross-section along the axis of magnetization. Properties for anisotropic magnets shall be measured along the axis of preferred orientation.
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 A977/A977M.  
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.  
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 14-May-2014
• ICS: 29.030 - Magnetic materials
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.02 - Material Specifications

Relations

• Replaces: ASTM A1054-07 - Standard Specification for Sintered Ceramic Ferrite Permanent Magnets
• Effective Date: 15-May-2014

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 −14
Standard Specification for
1
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 IEC 60404-8-1, Magnetic Materials Part 8: Specifications
for individual materials Section 1 – Standard specifica-
1.1 This specification covers technically important, com-
4
tions for magnetically hard materials
mercially available, magnetically hard sintered ceramic ferrite
International Air Transport Association (IATA) Dangerous
permanent magnets.
5
Goods Regulations, Packing Instruction 902
1.2 Ceramic ferrite magnets have residual magnetic induc-
tion Br from 2000 G (0.2 T) up to about 5000 G (0.5 T) and
3. Terminology
intrinsic coercive field strength H (H ) from 2000 Oe
ci cJ
3.1 The terms and symbols used in this specification are
(160 kA/m) up to about 5000 Oe (400 kA/m). Their specific
defined in Terminology A340.
magnetic hysteresis behavior (demagnetization curve) can be
characterized using Test Method A977/A977M.
4. Classification
1.3 The values stated in customary (cgs-emu and inch-
4.1 The classification of ceramic ferrite permanent magnets
pound) units are to be regarded as standard. The values given
is given in Tables 1 and 2, with cross-reference to MMPA
in parentheses are mathematical conversions to SI units which
Standard No. 0100-00 and IEC 60404-8-1 standards.
are provided for information only and are not considered
standard.
5. Ordering Information
1.4 This standard does not purport to address all of the
5.1 Orders for parts conforming to this specification shall
safety concerns, if any, associated with its use. It is the
include the following information:
responsibility of the user of this standard to establish appro-
5.1.1 Reference to this standard and year of issue/revision.
priate safety and health practices and determine the applica-
5.1.2 Reference to an applicable part drawing.
bility of regulatory limitations prior to use.
5.1.3 Magnetic property requirements if they are more
stringent that the minimum values listed in the tables.
2. Referenced Documents
5.1.4 Quantity required.
2
2.1 ASTM Standards:
5.1.5 The required magnetization state of the provided
A340 Terminology of Symbols and Definitions Relating to
material (unmagnetized, fully magnetized, magnetized and
Magnetic Testing
thermally stabilized, magnetized and partially demagnetized or
A977/A977M Test Method for Magnetic Properties of High-
“calibrated”). This information should appear on the part
Coercivity Permanent Magnet Materials Using Hyster-
drawing whenever possible.
esigraphs
5.1.6 Certification of magnetic property evaluation.
2.2 Other Standards: 5.1.7 Marking and packaging requirements.
MMPA Standard No. 0100-00 Standard Specifications for 5.1.8 Exceptions to this specification or special require-
3
Permanent Magnet Materials mentssuchasplating,coating,orfunctionaltestingasmutually
agreed upon by the producer and user.
1
This specification is under the jurisdiction of ASTM Committee A06 on 6. Chemical Composition
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
6.1 The general chemical composition of ceramic ferrite
Material Specifications.
Current edition approved May 15, 2014. Published June 2014. Originally magnets is MO · 6Fe O with M being barium, strontium, or
2 3
approved in 2007. Last previous addition approved in 2007 as A1054-07. DOI:
some combination of the two. New ferrite grades may also
10.1520/A1054-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4
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
1

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A1054−14
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 Cl
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A1054 − 07 A1054 − 14
Standard Specification for
1
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
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 H (H ) from 2000 Oe (160 kA/m) up to about 5000 Oe (400 kA/m). Their specific magnetic hysteresis
ci cJ
behavior (demagnetization curve) can be characterized using Test Method A977/A977M.
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.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A977/A977M Test Method for Magnetic Properties of High-Coercivity Permanent Magnet Materials Using Hysteresigraphs
2.2 Other Standards:
3
MMPA Standard No. 0100-00 Standard Specifications for Permanent Magnet Materials
IEC 60404-8-1, Magnetic Materials Part 8: Specifications for individual materials Section 1 – Standard specifications for
4
magnetically hard materials
5
International Air Transport Association (IATA) Dangerous Goods Regulations, Packing Instruction 902
3. Terminology
3.1 The terms and symbols used in this specification are defined in Terminology A340.
4. Classification
4.1 The classification of ceramic ferrite permanent magnets is given in Tables 1 and 2, with cross-reference to MMPA Standard
No. 0100-00 and IEC 60404-8-1 standards.
5. Ordering Information
5.1 Orders for parts conforming to this specification shall include the following information:
5.1.1 Reference to this standard and year of issue/revision.
5.1.2 Reference to an applicable part drawing.
5.1.3 Magnetic property requirements if they are more stringent that the minimum values listed in the tables.
5.1.4 Quantity required.
1
This specification is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on Material
Specifications.
Current edition approved May 1, 2007May 15, 2014. Published June 2007June 2014. Originally approved in 2007. Last previous addition approved in 2007 as A1054-07.
DOI: 10.1520/A1054-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from The International Magnetics Association (IMA), 8 South Michigan Avenue, Suite 1000, Chicago, IL 60603.
4
Available from IEC (International Electrotechnical Commission) Central Office 3, rue de Varembé, P.O. Box 131, CH - 1211, GENEVA 20 Switzerland.
5
Available from IATA, 800 Place Victoria, PO Box 113, Montréal, Quebec, H4Z 1M1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A1054 − 14
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 DesignationReference Product, Br, Field Strength, Field Strength, Permeability,
MGOe gauss (mT) Hc (HcB) H (H ) μrec G/Oe
ci cJ
3
(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
CE-I-01 1.03/3 Ceramic . S1-0-1 1.05 (8.4) 2300 (230) 1860 (148) 3250 (259) 1.2
1
A
Designations are XX-Y-ZZZ where:
XX = material type (CE = ceramic ferri
...