ASTM B610-00e1
(Test Method)Standard Test Method for Measuring Dimensional Changes of Metal Powder Specimens
Standard Test Method for Measuring Dimensional Changes of Metal Powder Specimens
SIGNIFICANCE AND USE
The dimensional change obtained under specified conditions of pressing and sintering is a material characteristic inherent in the powder. It is useful to the production, testing, and use of metal powders.
The absolute dimensional change may be used to classify powders or differentiate one type or grade from another, to evaluate additions to the powder mix or measure process changes, and to guide in the design of tooling.
The comparative dimensional change is mainly used as a quality control test to measure variations between lots of metal powders of the same material composition.
Factors known to affect size change are the test specimen process conditions of green density, sinter time, sinter temperature, sinter atmosphere, level of additions to the base metal powder, lubricant type, powder grade, powder type, and powder lot.
SCOPE
1.1 This test method covers a procedure for determining the change in dimensions that occurs as a result of sintering a metal powder specimen. The size change referred to is the difference between the die size and the size of the sintered specimen after it has cooled to room temperature, expressed as a percentage. This size change is a basic characteristic of the metal powder.
1.2 The general procedure of measuring a test specimen and die, the calculating he dimensional changes, as described in this test method, also may be used to determine green expansion, heat treat changes, or other dimensional changes of test specimens that result from processing steps.
1.3 The values stated in inch-pound units are to be regarded as the standard. The SI equivalents are in parentheses and may be approximate.
1.4 This standard does not purport to address all of the safety problems, 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.
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e1
Designation:B610–00
Standard Test Method for
Measuring Dimensional Changes of Metal Powder
Specimens
This standard is issued under the fixed designation B 610; 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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Editorial corrections were made in Sections 5, 8.6, 9, and 10.4 and Fig. 2.
1. Scope 4. Summary of Test Method
1.1 This test method primarily covers a procedure for 4.1 Test specimens are made from the metal powder lot
determining the change in dimensions that occurs as a result of under consideration by pressing and sintering or other process-
pressing and sintering a metal powder specimen. The size ing (see 1.2). The absolute dimensional change as a result of
change referred to is the difference between the die size and the pressing and sintering is calculated from measurements taken
size of the sintered specimen after it has cooled to room on the sintered test specimens and from the die cavity.
temperature, expressed as a percentage. This size change is a 4.2 Whenthismethodisusedtocomparemetalpowderlots,
basic characteristic of the metal powder. specimens from a reference metal powder lot agreed upon by
1.2 The general procedure of measuring a test specimen and the parties concerned are made and processed at the same time.
die, then calculating the dimensional change, as described in The dimensional change of the test specimen is calculated and
this test method, also may be used to determine green expan- mathematically compared with the dimensional change of the
sion, heat treat changes, or other dimensional changes of test reference specimen.
specimens that result from processing steps.
5. Significance and Use
1.3 The values stated in inch-pound units are to be regarded
5.1 The dimensional change obtained under specified con-
as the standard. The SI equivalents are in parentheses and may
be approximate. ditions of pressing and sintering is a material characteristic
inherent in the powder. It is useful to the production, testing,
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the and use of metal powders.
responsibility of the user of this standard to establish appro- 5.2 The absolute dimensional change may be used to
classify powders or differentiate one type or grade from
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. another, to evaluate additions to the powder mix or measure
process changes, and to guide in the design of tooling.
2. Referenced Documents
5.3 The comparative dimensional change is mainly used as
2.1 ASTM Standards: a quality control test to measure variations between lots of
B 215 Practices for Sampling Finished Lots of Metal Pow- metal powders of the same material composition.
ders 5.4 Factors known to affect size change are the test speci-
B 243 Terminology of Powder Metallurgy men process conditions of green density, sinter time, sinter
B 312 Test Method for Green Strength for Compacted temperature, sinter atmosphere, level of additions to the base
Metal Powder Specimens metal powder, lubricant type, powder grade, powder type, and
powder lot.
3. Terminology
6. Apparatus
3.1 Definitions—For definitions of terms used in this test
method, see Terminology B 243. 6.1 Balance, suitable for weighing accurately to 0.01 g.
6.2 Mixer, capable of thorough and controlled mixing of
metal powders and lubricants.
This test method is under the jurisdiction of ASTM Committee B09 on Metal
6.3 Compression-Testing Machine or Powder Press, ca-
Powders and Metal Powder Products and is the direct responsibility of Subcom-
pable of applying the required pressure to produce the test
mittee B09.02 on Base Metal Powders.
Current edition approved April 10, 2000. Published June 2000. Originally
specimen.
published as B 610 - 76. Last previous edition B 610 - 93.
Annual Book of ASTM Standards, Vol 02.05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B610
6.4 Punches and Die, for producing a test specimen, are
shown in Fig. 1.
6.5 Micrometers, capable of measuring the necessary di-
mensions to 0.0001 in. (0.0025 mm).
6.6 Sintering Furnace, capable of maintaining a specified
work temperature and having controlled atmosphere and a
water-jacketed cooling zone.Avacuum furnace also is permit-
ted.
6.7 When the dimensional change test is run to approve FIG. 2 Dimensional Change Test Specimen
metal powders for production, it is preferable to use sintering
conditions that approximate or simulate production conditions.
8.5 When the dimensional change method is used to ap-
proveametalpowderlot,allpowderandprocessingconditions
7. Test Specimen
shall be agreed upon by the parties c
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