Test Device and Method for Evaluation of Lubricants for P/M Compaction

摘要

A critical path to increase mechanical properties, especially fatigue strength, is to increase part density. A logical way to increase part density is to decrease the amount of admixed lubricant, decrease friction losses and compact at elevated temperature. A test device and test method was developed to permit the direct measurement of powder/die friction at temperatures up to 200℃. Commercial and experimental lubricants (admixed and die -wall) were evaluated at several die temperatures and compaction pressures. The effect of die temperature on "stick" and "slide" friction values is used to demonstrate the method's effectiveness.