|
Compaction / Ejection Publications
|
|
Single Pressed Single Sintered P/M Products for High Density, High Performance Applications
(info)
|
|
PDF (244.1 KB)
|
|
Further improvements are being developed in binder and lubricant technology that makes it possible to reach green densities approaching 7.4 g/cm3 in some applications, without the need to heat the iron powder or to double press and double sinter. This paper outlines the progress of this research. The effect of die temperature and part length on ejection behavior and final properties has been studied. In addition, optimal processing parameters as well as mechanical data are presented.
|
|
Higher Density and Higher Performance by Single Pressing and Sintering
(info)
|
|
PDF (226.1 KB)
|
|
Further improvements were made in binder and lubricant technology that makes it possible to reach green densities approaching 7.4 g/cm3 in some applications, without the need to heat the iron powder or to double press and double sinter. The effect of die temperature and part length on ejection behavior and final properties will be studied. In addition, optimal processing parameters as well as mechanical data will be presented.
|
|
Binder Treated Products for Higher Densities and Better Precision
(info)
|
|
PDF (82.9 KB)
|
|
Continuing research in the chemistry of binders and lubricants yielded novel materials that combine traditional binder properties with improved lubricity and better dimensional control. New binder-lubricant systems were developed with lower organic content that made it possible to reach higher green and sintered densities and exceptional mechanical properties. Better powder flow and higher apparent density result in more uniform die fill, giving better weight and dimensional control and increased part precision. A comparison of the newly developed binder/lubricant system is made with traditional lubricants, such as EBS and zinc stearate.
|
|
Methods to Improve the Fatigue Life of Sinter-Hardened Components
(info)
|
|
PDF (56.9 KB)
|
|
Previous experimental work showed that fatigue performance is affected by the alloy system, heat treatment method, and microstructural features of test specimens. The present study will present information concerning the effects of varying the sinter-hardening cooling rate (and subsequent microstructure features) on the mechanical properties sinter-harden steels and the Ancorloy® MDCL material system. Emphasis will be given to the rotating bending fatigue performance of these systems and how this experimental data correlates with the fatigue performance of the actual component in accelerated life testing.
|
|
Processing of Hybrid Alloys to High Densities
(info)
|
|
PDF (586.1 KB)
|
|
Premixes containing prealloy molybdenum, such as Ancorsteel® 85HP, nickel and graphite have exceptional mechanical properties. This presentation will highlight the properties of these materials processed to densities of 7.25 to 7.45 g/cm3 by single press, single sinter techniques. The exceptional green strength of these materials in combination with density provides a unique opportunity to convert more automotive components to PM.
|
|
Test Device and Method for Evaluation of Lubricants for PM Compaction
(info)
|
|
PDF (615.7 KB)
|
|
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 200ºC. 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.
|