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May/June 2009

Sintered Powder Metallurgy

Two recently approved ASTM International standards provide user-friendly tests for properties of sintered metallurgy products.

The new standards, developed by Subcommittee B09.04 on Bearings, are B962, Test Methods for Density of Compacted or Sintered Power Metallurgy (PM) Products Using Archimedes’ Principle, and B963, Test Methods for Oil Content, Oil-Impregnation Efficiency and Interconnected Porosity of Sintered Powder Metallurgy (PM) Products Using Archimedes’ Principle. Subcommittee B09.04 is part of ASTM International Committee B09 on Metal Powders and Metal Powder Products.

According to W. Brian James, Hoeganaes Corp., and a member of B09, both new test methods are based on tests originally contained in an older standard, B328, Test Method for Density, Oil Content and Interconnected Porosity of Sintered Metal Structural Parts and Oil-Impregnated Bearings. However, Subcommittee B09.04 decided that, for ease of use, the tests would better serve users in separate standards.

ASTM B962 provides the means, through the use of Archimedes’ principle, to determine the volume in order to calculate the density of complex three-dimensional shapes such as those formed and used in the powder metallurgy industry.

Test methods for oil content, oil-impregnation efficiency and interconnected porosity have been revised for the new standard, B963. James says that results of the tests covered in B963 will be used for quality control or for compliance purposes.

All interested parties are invited to participate in the interlaboratory study that Subcommittee B09.04 is planning to determine test precision.


Technical Information: W. Brian James, Hoeganaes Corp., Cinnaminson, N.J.

Phone: 856-303-2741

ASTM Staff: Christine Sierk

Phone: 610-832-9728