1、Designation: B329 06 (Reapproved 2012)B329 14Standard Test Method forApparent Density of Metal Powders and Compounds Usingthe Scott Volumeter1This standard is issued under the fixed designation B329; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 Th
3、is test method covers determination of the apparent density of metal powders and related compounds using the ScottVolumeter, also known as the Paint Pigment Volumeter.1.2 The values With the exception of the values for density and the mass used to determine density, for which the use of thegram per
4、cubic centimetre (g/cm3) and gram (g) units is the longstanding industry practice, the values stated in SI units are to beregarded as the standard. The values given in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated wi
5、th its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B215 Practices for Sampling Metal PowdersB243 Terminology of Powder M
6、etallurgyB873 Test Method for Measuring Volume of Apparent Density Cup Used in Test Methods B 212, B 329, and B 4173. Terminology3.1 DefinitionsFor definitions of terms used in this test method see Terminology B243.4. Significance and Use4.1 This test method covers the evaluation of the apparent den
7、sity physical characteristic of powders. The degree of correlationbetween the results of this test and the quality of powders in use will vary with each particular application and has not been fullydetermined.4.2 The apparent density measured via this test method is often referred to as the “Scott D
8、ensity.”5. Apparatus5.1 Fig. 1 shows the Scott Volumeter consisting of the following parts:5.1.1 Top Funnels A large funnel with a 16-mesh screen and a small conical funnel for directing the powder into the bafflebox. Funnels and screen may be brass or stainless steel.5.1.2 Baffle BoxA box with two
9、glass sides and two wooden sides containing a series of four glass baffle plates.The wooden baffle box may be substituted by a water-resistant material, such as stainless steel, if washing is more desirable thanair cleaning.1 This test method is under the jurisdiction ofASTM Committee B09 on Metal P
10、owders and Metal Powder Products and is the direct responsibility of Subcommittee B09.03on Refractory Metal Powders.Current edition approved Oct. 1, 2012Dec. 1, 2014. Published October 2012January 2015. Originally approved in 1958. Last previous edition approved in 20062012 asB329 98 (2006).(2012).
11、DOI: 10.1520/B0329-06R12.10.1520/B0329-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is no
12、t 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. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriat
13、e. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.
14、1.3 Bottom FunnelAsmall brass or stainless steel funnel directly beneath lower baffle box opening for directing the powderinto the density cup.5.1.4 Density Cups A cylindrical cup having a capacity of 25.00 6 0.03 cm3, with an inside diameter of 28.00 6 0.50 mm;28.00 6 0.50 mm; or a square cup with
15、a capacity of 16.39 6 0.05 cm3 (1.000 6 0.003 in 3). Density cups may be either brassor stainless steel.5.1.5 StandA90 A 90 pivoting wooden or stainless steel stand to support the funnels and the baffle box concentric with thedensity cup so that the bottom funnel lower opening is 19 mm (34 in.) abov
16、e the top of the density cup as shown in Fig. 1 whenusing the cubic inch cup. Fig. 2 shows some suggested modifications for use of the metric cup. Modifications A and C of Fig. 2FIG. 1 Density Apparatus AssemblyFIG. 2 Suggested Methods of Modifying the Wooden Scott Volumeter for Metric Density CupB3
17、29 142are suggested when the metric cup is to be used exclusively. Modification B of Fig. 2 is suggested when both cups are to be usedinterchangeably.5.2 Instrument SupportA stand or bench surface, level and vibration free.5.3 BalanceA balance having balance, readable to 0.01 g with a capacity of at
18、 least 200 g and an accuracy of 60.05 g withfull-range taring capability. g, to determine the mass to the nearest 0.1 g.5.4 BrushA good quality, 25.4-mm (1-in.) wide brush, preferably nylon.5.5 SpatulaA standard 12.7-mm (12-in.) wide stainless steel laboratory spatula.6. Test Specimen6.1 Obtain a te
19、st specimenportion in accordance with Practices B215.6.2 A minimum of 25 cm3 (1.5 in.3) of powder for the square cup and 35 cm3 (2.0 in.3) of powder for the cylindrical cup willbe needed.7. Calibration and Standardization7.1 The density cups shall be calibrated in accordance withASTM Test Method B87
20、3. If the density cup falls outside acceptabletolerance limits, 25.00 6 0.03 cm3 for the round cup; or a square cup with a capacity of 16.39 6 0.05 cm3, it is not to be used.8. Procedure8.1 Tare or preweigh the density cup.8.2 Pour the powder being tested carefully into the top receiving funnel and
21、permit the powder to run into the density cup.Completely fill the density cup to overflowing or fill to overflowing and form a mound of powder above the top of the density cup.If the powder is not free-flowing, carefully brush the sample through the top receiving funnel screen without jarring the vo
22、lumeter.Jarring of the volumeter could result in packing of the powder in the density cups, thus giving erroneously high values.8.3 Remove the excess powder in the density cup by passing the edge of the spatula blade parallel to, and in contact with, thetop of the cup. Move the spatula smoothly alon
23、g the top surface of the cup and back again until all excess powder has beenremoved, special care being taken to direct the excess powder into the unfilled areas of the cup. It is important that the spatula bekept level at all times to prevent packing or pulling out of the powder. Perform the comple
24、ted leveling operation to produce auniform powder surface perfectly level with the top of the density cup.8.4 After the leveling operation, lightly tap the side of the density cup to settle the powder to avoid spilling while transferringthe cup to the balance for weighing.8.5 Determine the mass of t
25、he powder to the nearest 0.1 g by weighing the cup plus powder and, if preweighed and not tared,subtracting the mass of the cup.9. Calculation9.1 Divide the mass of the powder by the volume of the cup to obtain the apparent density.10. Report10.1 Report test results as “Scott Density” or “Apparent D
26、ensity, Scott”Scott Density, ADs, in grams per cubic centimetre tothe nearest 0.1 0.1 gg/cmcm3.NOTE 1If the square cup is used, multiply the result obtained in grams per cubic inch by 0.0610 for conversion to grams per cubic centimetre.10.2 Report which density cup was used in the test.10.3 Include
27、a reference to this test method in the report.11. Precision and Bias11.1 PrecisionPrecision has been determined from round-robininterlaboratory testing performed prior to the approval of thistest method. Those results, which have been re-verified, show a precision of from 63 to 7 % of the value dete
28、rmined as the 2 limits for powders with apparent densities of 1 to 5 g/cm3.11.2 BiasBias cannot be stated since there is no universally accepted standard instrument, nor are there certified standardsavailable.12. Keywords12.1 apparent density; bulk density; Paint Pigment Volumeter; powder metallurgy
29、; powders; refractory metals; Scott density;Scott VolumeterB329 143SUMMARY OF CHANGESCommittee B09 has identified the location of selected changes to this standard since the last issue(June(B329-06(2012) 2003) ) that may impact the use of this standard. (Approved Nov. 1, 2006Dec. 1, 2014)(1) Modific
30、ations were made Changed units statement in Section 1.2 to the test method to allow for the use of stainless steel upperand lower funnels, density cups, and baffle box as alternatives to the brass funnels and cups and wooden baffle box.be consistentwith the B09 Policy Guide.(2) The sole source refer
31、ences were removed.Added statement regarding calibration and tolerance of density cups.(3) Made “practices” in section 6.1 plural.Removed all references to inch-pound units throughout.(4) Changed ml and cc to cm3 throughout.(5) Modifications applied to make the test method consistent with B09 Policy
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