Significance and Use
The volume of a complex shaped PM part cannot be measured accurately using micrometers or calipers. Since density is mass per unit volume, a precise method for measuring the volume is needed. Archimedes’ principle may be used to calculate the volume of water displaced by an immersed object. For this to be applicable to PM materials that contain surface connected porosity, the surface pores are sealed by oil impregnation or some other means.
The green density of compacted parts or test pieces is normally determined to assist during press set-up, or for quality control purposes. It is also used for determining the compressibility of base powders, mixed powders, and premixes.
The sintered density of sintered PM parts and sintered PM test specimens is used as a quality control measure.
The impregnated density of sintered bearings is normally measured for quality control purposes as bearings are generally supplied and used oil-impregnated.
1.1 This standard describes a method for measuring the density of powder metallurgy products that usually have surface-connected porosity.
1.2 The density of impermeable PM materials, those materials that do not gain mass when immersed in water, may be determined using Test Method B 311.
1.3 The current method is applicable to green compacts, sintered parts, and green and sintered test specimens.
1.4 With the exception of density values, for which the g/cm3 unit is the industry standard, the values stated in SI units are to be regarded as the standard. The values given in parentheses are converted in accordance with IEEE/ASTM SI 10 and are for information only.
1.5 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
SI10 American National Standard for Use of the International System of Units (SI): The Modern Metric System
B243 Terminology of Powder Metallurgy
B311 Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Porosity
density; green density; impregnated density; PM products; powder metallurgy products; sintered density;
ICS Number Code 77.160 (Powder metallurgy)
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Citing ASTM Standards
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