Subscribe to the EPMA Mailing List

Following Shrinkage And Warping By Thermo-Optical Measurement Techniques

  • : Torsten E.M. Staab1, Andreas Diegeler2
  • : 1Universität Würzburg, 2Fraunhofer ISC
  • : PDF Download
  • : 2016


We investigate micro-structural changes in powder metallurgical samples of carbonyl-iron and stainless steel by different methods: X-ray diffraction and positron annihilation spectroscopy. Positron annihilation gives information about dislocation densities and porosity in PM-samples. The sample are sintered to certain stages and then rapidly cooled to freeze-in this stage for the ex-situ investigations.  

Dimensional changes and possible warping are recorded for samples up to 40mm in diameter by our thermo-optical measurement device with atmospheric control (TOM-AC). This contact-less methods allows to follow dimensional changes (accuracy of 0.5 microns) of samples up to 40mm in diameter. 

During the sintering process we apply several load levels to investigate the influence of effects caused in processes employing constrained sintering. Additionally, the sintering atmosphere has been varied during the heat treatment (pure inert gases (Ar, N) and Ar-/N-Hydrogen mixtures). 


Non-EPMA member price shown. If you are an EPMA member please log in for your discount.
If you are logged in as a member but are still seeing this message, please contact us at
If you would like to find out about becoming an EPMA member, click here.
This product is currently only available to purchase via this website to companies with a valid EU VAT Number. If you are an individual or company without an EU VAT number wishing to purchase this, please contact EPMA directly at Alternatively, past Euro PM papers are available via ProQuest and Elsevier.
* This field is required

Other publications you may be interested in:

Go To Top