ASTM A900/A900M-01(2012)

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Designation: A900/A900M − 01 (Reapproved 2012)
Standard Test Method for
Lamination Factor of Amorphous Magnetic Strip
This standard is issued under the fixed designationA900/A900M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 This test method is used to predict the fraction of metal
that is included in the volume of the firm coil wound from the
1.1 This test method covers measurements of lamination
specimen tape.
factor (Note 1) of a specimen composed of strips cut from
amorphous magnetic material. It is suitable for the determina-
4. Interferences
tion of lamination factor for thin, flat case, metallic strip
4.1 This test method is predicated on correctly aligned test
ranging in width from 0.25 to 8.00 in. [6.35 mm to 203 mm]
strips and uniform compression during test. Both of these
and in thickness from 0.0005 to 0.005 in. [12.7 to 127 µm].
conditions are difficult to meet whenever the test specimens
NOTE 1—Lamination factor is also termed space factor or stacking
have one or more elevated ridges running lengthwise along the
factor.
surface of the strip.
1.2 The values and equations stated in customary (egs-emu
4.2 This test method also presupposes that the test speci-
and inch-pound) or SI units are to be regarded separately as
mensarefreefromotherdefects,suchascamberandwaviness,
standard. Within this standard, SI units are shown in brackets.
that may affect the lamination factor.
Thevaluesstatedineachsystemmaynotbeexactequivalents;
therefore,eachsystemshallbeusedindependentlyoftheother.
5. Apparatus
Combining values from the two systems may result in noncon-
5.1 Micrometers—Two types of micrometers are included
formance with this standard.
for use in this test method as follows:
1.3 This standard does not purport to address all of the
5.1.1 Motor-Operated, Deadweight (Not Spring) Actuated
safety concerns, if any, associated with its use. It is the
Micrometer, conforming to the following requirements:
responsibility of the user of this standard to establish appro-
5.1.1.1 The micrometer shall be a deadweight digital- or
priate safety and health practices and determine the applica-
dial-type micrometer, having two ground and lapped circular
bility of regulatory limitations prior to use.
surfaces with a capacity of not less than 0.030 in. [0.75 mm].
The movable face or presser foot shall have an area of 0.25 to
2. Summary of Test Method 2 2
0.33 in. [160 to 215 mm ] and corresponding to a diameter of
2.1 The laminated test specimen is oriented and aligned, approximately 0.56 to 0.65 in. [14.2 to 16.5 mm]. The fixed
then subjected to pressure in a compression device. The face or anvil shall be of such size that the whole area of the
resulting volume is then determined from the measured speci- presser foot is in contact with the anvil in the zero position.
men height, width, and length. An equivalent solid volume is 5.1.1.2 The surface shall be parallel to within 0.00005 in.
calculated from the specimen mass and the true density of the [0.0012 mm] and the presser foot shall move on an axis
specimen material. The ratio of the calculated (equivalent perpendicular to the anvil.
solid) volume to the measured volume is the lamination factor. 5.1.1.3 The presser foot shall exert a steady pressure on the
specimen of 7.0 to 8.0 psi [48 to 55 kPa].
3. Significance and Use
5.1.1.4 A digital readout is preferred. If an analog gauge is
used,thedialshallbeatleast2in.[51mm]indiameter.Itshall
3.1 Lamination factor S indicates the deficiency of effective
be continuously graduated to read directly to 0.0001 in.
material volume which is due to the presence of oxides,
[0.0025 mm] and shall be required with a telltale hand, if
roughness, insulating coatings, and other conditions affecting
necessary,recordingthenumberofcompleterevolutionsofthe
the strip surface.
large hand.
5.1.1.5 The micrometer shall be capable of repeating its
readings to 0.00005 in. [0.0012 mm] at zero setting or on a
This test method is under the jurisdiction of ASTM Committee A06 on
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
steel gauge block.
Methods.
5.1.1.6 The deviations for the parts of the scale correspond-
CurrenteditionapprovedMay1,2012.PublishedJuly2012.Originallyapproved
ing to the specimen thickness measured shall be applied as
in 1991. Last previous edition approved in 2006 as A900/A900M–01(2006). DOI:
10.1520/A0900_A0900M-01R12. corrections to the thickness reading.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A900/A900M − 01 (2012)
7.2 Stack the test strips directly on top of one another in the
aligning fixture. Maintain the proper directionally as in Fig. 2.
7.3 Align the edges of the strips and secure the stack by
FIG. 1 Ribbon Length for Lamination Factor Testing With Refer-
clamping.
ence Marks
7.4 Determine the maximum thickness of the specimen
5.1.1.7 Theframeofthemicrometershallbeofsuchrigidity
stack by making multiple measurements across the entire
that a load of 3 lb [1.5 kg] applied to the dial housing, out of
width, at intervals slightly smaller than the presser foot of the
contact with either the weight or the presser foot spindle, will
micrometer, to ensure a small overlap in the area covered. The
produce a deflection of the frame not greater than 0.0001 in.
maximum height measured is recorded and used in the lami-
[0.0025 mm], as indicated on the micrometer dial.
nation factor computation.
5.2 Manually Operated Deadweight (Not Spring) Actuated
Di
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